source string | id string | question string | options list | answer string | reasoning string |
|---|---|---|---|---|---|
OpenBookQA | OpenBookQA-2701 | species-identification
Title: What species of viper is this? I think that the snake in the pictures here below is a viper. I found it on a hiking trail on a mountain in Bulgaria. Height was about 2000 meters and the weather wasn't warm as you might expect in a late Spring days, but it seemed quite active.
If it really... | [
"icebergs",
"a field",
"grass fed cattle",
"amphibians on Uranus"
] | B | grass snakes live in grass |
OpenBookQA | OpenBookQA-2702 | neuroscience
Title: Nervous system : Nerve signals If the electrical signals from all the various organs throughout the body eventually connect to the nerves in the spinal column traveling up to the brain, how does the brain differentiate the different signals. Is the nerve in the spinal column like an electrical cond... | [
"rock",
"ice",
"shrew",
"tree"
] | C | nervous system is an electric conductor |
OpenBookQA | OpenBookQA-2703 | evolution, taxonomy, ornithology
Title: Birds and Dinosaurs This came up in an argument with some friends. I know that birds are direct descendants of dinosaurs, shown pretty clearly through the fossil record. However, is it proper to say that birds are dinosaurs, or is there an actual distinction? I bet you'll be int... | [
"car parts",
"fuel",
"fun",
"food"
] | B | oil is a source of energy |
OpenBookQA | OpenBookQA-2704 | geophysics, seismology, instrumentation
Title: How can I calculate the sensitivity of a seismometer? I would like to know if a specific seismometer can measure 1 micron/sec velocity. I have a few specs from the datasheet but I'm not a seismologist and am trying to figure out how to relate the specs to one another.
I h... | [
"tree",
"bird",
"shoe",
"bed"
] | A | a seismometer is used to measure the strength or magnitude of an earthquake |
OpenBookQA | OpenBookQA-2705 | zoology, ecology, species-distribution, migration
Title: How do animals end up in remote areas? I was thinking specifically about random marshy water holes on farmers fields. It seems that you can visit just about any one of these and you will find frogs if you look hard enough.
They usually don't seem to be connected... | [
"beach area",
"spring",
"winter",
"birds"
] | C | some birds live in forests |
OpenBookQA | OpenBookQA-2706 | newtonian-mechanics, forces, conservation-laws, collision, free-body-diagram
So, we've just demonstrated that the ground can and does produce a greater force on the object than its weight. If this effect continues after the object's velocity reaches zero, then the object will rebound (i.e. it is an elastic collision)... | [
"accelerated",
"halted",
"off-balance.",
"wind-blown"
] | B | stopped means no speed |
OpenBookQA | OpenBookQA-2707 | human-anatomy
Taken from here such people would be able to dislocate then get their hands in front and relocate.
The body can be trained to be quite flexible through training like gymnastics etc...
The following is multiple choice question (with options) to answer.
If a leg is moving then the bones inside the skin ar... | [
"being controlled by brawn",
"being slowly softened up",
"being made to break down",
"being torn into pieces"
] | A | muscles pull bones to move the bones |
OpenBookQA | OpenBookQA-2708 | fluid-dynamics, everyday-life, water
As can be seen from these photos, the colour dye is present in the water jets which recoil off the surface of the transparent pool water. However, not all of the water in the jets is from the coloured drop. Some of the original drop is trapped in a pocket below the surface, with th... | [
"be dangerous",
"be safe",
"be messy",
"be playful"
] | B | chemical splashing sometimes occurs during experiments |
OpenBookQA | OpenBookQA-2709 | career
Title: Data science career problems: interaction of technical and social difficulties I have been trying to break into the bioinformatics space (and now, data science more generally).
Although there are numerous challenges in this field and I am constantly learning to deal with them, I have have found the most ... | [
"watches",
"fights",
"slaughters",
"explodes"
] | A | scientists make observations |
OpenBookQA | OpenBookQA-2710 | organic-chemistry, physical-chemistry, biochemistry, alcohols
Title: Storage of Urine Not all may be favorable to this project, but I will explain what I am trying to do. I work at home, and instead of walking a moderate distance to the bathroom and loosing my focus, I've been, at times, peeing in a 3 Quart Poland Spr... | [
"use it up",
"use it sparsely",
"use it quickly",
"finish it off"
] | B | An example of conservation is not using fossil fuel |
OpenBookQA | OpenBookQA-2711 | # Word problem help
#### Stephen
could you please tell me how I set this up to solve? thanks
a veterinarian has two solutions that contain different concentrations of a certain medicine. One is 15% concentration and the other is 5 % concentration. How many cubic centimeters of each should the veterinarian mix to get... | [
"sugar candy from store",
"water fluid within a sugar casing",
"soda pop within a can",
"sweets grains and flavors dissolved in liquid base of water"
] | D | a solution is made of one substance dissolved in another substance |
OpenBookQA | OpenBookQA-2712 | # Thread: Most likely of two examples
1. ## Most likely of two examples
Hi My instructor gave us two examples and posed a question:
We have a fair coin which is more likely?
1. We flip the coin 100 times and see exactly 50 heads.
2. We flip the coin 1000 times and see exactly 500 heads.
Someone in the class said ... | [
"an archaeologist finds an ancient crustacean in magma",
"an archaeologist finds an ancient crustacean in limestone",
"an archaeologist finds an ancient human in limestone",
"an archaeologist finds an ancient human in magma"
] | B | organisms can be preserved in sedimentary rock |
OpenBookQA | OpenBookQA-2713 | natural-disasters, forest, extreme-weather, fire
Title: Why don't forest fires in Western Australia get as much attention as forest fires in the southeast of the country (including SA)? WA gets plenty hot and dry in the summer (especially Exmouth and points south where Top End moisture isn't as prevalent), but I don't... | [
"the mercury read high in the thermometer that day",
"it was a cloudy day",
"it was a very rainy day",
"it was a very cold day"
] | A | high temperatures can cause an object to combust |
OpenBookQA | OpenBookQA-2714 | Best Japanese Brown Rice, Air Fryer Burgers And Fries, østfold University College Vacancies, Band T-shirts Walmart, How To Become An Anglican Priest, Too Much Fennel Taste, Porter Cable Circular Saw Cordless, Utmb My Chart, Iams Large Breed Dog Food Nutrition Facts,
The following is multiple choice question (with opti... | [
"a plant",
"a tree",
"a canary",
"a tunafish"
] | D | tuna eat fish |
OpenBookQA | OpenBookQA-2715 | habitable-zone
An orange dwarf star may live for 10 to 30 billions years in the main sequence. A red dwarf star may live in the main sequence for trillions of years.
However, planets in the habitable zone of red dwarfs are likely to become tidally lock, and we don't know if this is really that bad or not for life biod... | [
"in a small cage",
"in a reef in the ocean",
"in a tropical environment",
"much closer to one of the earth's poles than to the equator"
] | D | polar bears live in cold environments |
OpenBookQA | OpenBookQA-2716 | astronomy, telescopes
Title: Fall/Winter Viewing I live in Seattle and am thinking of purchasing a telescope. Is fall/winter a decent time of year for viewing (aside from summer)? Are there any major viewings/events during that this of year?
I know I live in a city of rain, but there are some nice nights. The sky is ... | [
"new zealand",
"arctic",
"hawaii",
"beach"
] | B | the arctic environment is covered in snow |
OpenBookQA | OpenBookQA-2717 | space, rocket-science, space-travel
Title: Get into orbit from the Redbull jump position to a satellite position by using a cord/rope? Its difficult to put this into the title.
I was watching the Redbull Jump and noticed that the height of this is at 39 kilometres (24 mi) the atmosphere pressure is at I believe about ... | [
"near the equator",
"on the moon",
"near the sea",
"in a laboratory"
] | B | the surface of the Moon contains mountains |
OpenBookQA | OpenBookQA-2718 | biochemistry, botany, plant-physiology, photosynthesis
What are typical characteristics of different plants in this regard? I.e., how do common species of plants manage their C consumption before (and after) the development of leaves? There are quite a few questions and thoughts in there, I'll try to cover them all:
F... | [
"sunlight",
"local flora",
"power plants",
"plant toys"
] | B | a plant requires photosynthesis to grow |
OpenBookQA | OpenBookQA-2719 | botany
Title: Do plants absorb toxins from the soil? Consider a plant like Aloe Vera that grows up in a toxic environment where the concentration of pesticides, and materials like lead, mercury, cadmium, arsenic etc is very high(e.g. Marshland dumping yard ). Would that mean that the extract from these plants would co... | [
"Corn",
"air",
"Runoff",
"farmers"
] | C | eating food that contains pesticides can have a negative impact on humans |
OpenBookQA | OpenBookQA-2720 | electric-circuits, potential, electrical-resistance, conductors
These analogies are not exact and are only intended to give you a better feel as to what is happening.
Hope this helps.
The following is multiple choice question (with options) to answer.
An example of an electrical circuit running properly would be | [
"dimming lights",
"swimming in pools",
"running outside",
"riding bikes"
] | A | when an electrical circuit is working properly , electrical current runs through the wires in that circuit |
OpenBookQA | OpenBookQA-2721 | entomology
Title: What is the name of this tiny creature? It looks like a tiny piece of moving cotton? By chance, I saw this tiny insect on my bag a few days ago in Sydney. Am I the first person who has pinpointed this animal?! If not can you please let me know its name? From your image, it looks like it might be a wo... | [
"Anger",
"poop",
"love",
"Sarcastic"
] | B | An example of camouflage is when something has the same color as its environment |
OpenBookQA | OpenBookQA-2722 | 5. Jul 21, 2014
### George Jones
Staff Emeritus
Related to DH's post:
RMS voltage multiplied by (in phase) RMS current gives average power. Some references call this product RMS power, but this is not correct, it is average power, hence the equivalent brightness of a lightbulb.
The following is multiple choice ques... | [
"a hard wood chip",
"a set of AAA cells",
"a metal iron rod",
"a sachet of water"
] | B | a battery is a source of electrical energy |
OpenBookQA | OpenBookQA-2723 | experimental-chemistry, home-experiment, teaching-lab
Title: In which country is it allowed to practice non-clandestine amateur chemistry? I travel a bit so am flexible where I live, and have taken a recent interest in chemistry to try to gain an understanding of physical reality. I find learning from textbooks to be ... | [
"use all dirty equipment",
"fully comprehend the instructions before starting",
"do the opposite of what you're supposed to do",
"instead of measuring things, make guesses"
] | B | performing lab expiriments accurately requires understanding all directions beforehand |
OpenBookQA | OpenBookQA-2724 | general-relativity, time, equivalence-principle
the one near the earth will have a greater acceleration than the one on the mountain
Yes; as shown in the indicated answer, the two participants which remain rigid to each other in a flat region move at ("slightly") different constant proper accelerations, too;
namely ... | [
"arriving at airport",
"waiting for cabs",
"at the bottom",
"at the apex"
] | D | high means great in altitude |
OpenBookQA | OpenBookQA-2725 | remote-sensing, forest
Title: How is tree age estimated? I am trying to study about forest biomass and carbon amount of forest.
First of all, I studied some papers, they mentioned that age of forest is related to the biomass. So, How do we measure the age of tree? What are the practical ways used to estimate tree age?... | [
"think about it",
"bury it",
"look at leaves",
"look inside it"
] | D | the number of rings in a tree trunk can be used to estimate the age of the tree |
OpenBookQA | OpenBookQA-2726 | astrophysics, orbital-motion, celestial-mechanics, solar-wind, solar-sails
So a really big coronal mass ejection could indeed significantly boost the thrust from a solar sail, but I think we need to inject a note of reality. Firstly the force is still very small so even for a very large CME our solar sail powered spac... | [
"explode",
"stop midair",
"accelerate",
"decelerate"
] | C | force causes the speed of an object to increase |
OpenBookQA | OpenBookQA-2727 | atmosphere, ocean, hydrology, climate-change
Comment: I strongly endorse the use of wind and hydropower as sources of energy over the further use of fossil fuels. However, I still think it is important to do research into the actual renewability of presumed-renewable energy sources, as we don't want to end up with ano... | [
"moons",
"suns",
"orbits",
"environments"
] | D | the Earth contains many ecosystems |
OpenBookQA | OpenBookQA-2728 | homework-and-exercises, thermodynamics, temperature, everyday-life
Title: Why is my hand not burned by the air in an oven at 200 °C? I have this problem from University Physics with Modern Physics (13th Edition):
The inside of an oven is at a temperature of 200 °C (392 °F). You can put your hand in the oven without i... | [
"you will feel cool",
"you will be chilled",
"your nervousness will disappear",
"your nerves will make you aware"
] | D | nerves can be used to feel heat and pressure on the skin |
OpenBookQA | OpenBookQA-2729 | Hey, thanks for your help guys. For a minute there, I thought that this theoretical person could not safely expect to live to be 82 years old.
9. Jun 16, 2012
### SW VandeCarr
In fact, on a purely probabilistic basis, for any finite time no matter how large, there is a non zero probability that a person would surviv... | [
"block in their yard",
"salt their whole yard",
"burn trash in their yard",
"flood their whole yard"
] | A | An example of protecting the environment is creating protected areas |
OpenBookQA | OpenBookQA-2730 | biochemistry, botany, plant-physiology, photosynthesis
What are typical characteristics of different plants in this regard? I.e., how do common species of plants manage their C consumption before (and after) the development of leaves? There are quite a few questions and thoughts in there, I'll try to cover them all:
F... | [
"get rid of waste",
"absorb energy that the closest star provides",
"keep warm from thermal energy",
"absorb light colored food from the soil"
] | B | chlorophyll is used for absorbing light energy by plants |
OpenBookQA | OpenBookQA-2731 | biochemistry, botany, plant-physiology, photosynthesis
What are typical characteristics of different plants in this regard? I.e., how do common species of plants manage their C consumption before (and after) the development of leaves? There are quite a few questions and thoughts in there, I'll try to cover them all:
F... | [
"use it right away",
"sell it to someone",
"save it for future use",
"give it to a friend"
] | C | usually plants store the food they produce for future use |
OpenBookQA | OpenBookQA-2732 | zoology, ecology, species-distribution, migration
Title: How do animals end up in remote areas? I was thinking specifically about random marshy water holes on farmers fields. It seems that you can visit just about any one of these and you will find frogs if you look hard enough.
They usually don't seem to be connected... | [
"lake fronts",
"birds",
"spring",
"winter"
] | D | An example of migration is birds flying south in the winter |
OpenBookQA | OpenBookQA-2733 | physical-chemistry, aqueous-solution, gas-laws, vapor-pressure
An example of this situation playing out in the environment can be seen in the growth of water and ice particles in clouds. The vapor pressure of one particle can differ from that of another due to solute concentration, particle size (small droplets have a... | [
"cats lick their fur",
"headphones fall into a puddle",
"hail falls from the sky",
"water forms on a frosty beverage"
] | D | condensing causes a liquid to form |
OpenBookQA | OpenBookQA-2734 | atmosphere, ocean, hydrology, climate-change
Comment: I strongly endorse the use of wind and hydropower as sources of energy over the further use of fossil fuels. However, I still think it is important to do research into the actual renewability of presumed-renewable energy sources, as we don't want to end up with ano... | [
"Happiness",
"Love",
"Anger",
"a magnetic creation"
] | D | the Earth absorbs more energy than it loses |
OpenBookQA | OpenBookQA-2735 | human-biology
Title: Do biological facts determine when a human fetus is considered alive and human? I often hear or read this statement:
"It's not a human, it's a fetus."
In other words, some think a fetus is non-human until a certain point.
And another similar statement:
"The fetus isn't alive until 26 weeks of g... | [
"under age",
"too old",
"young",
"aged enough"
] | D | reproduction occurs during adulthood |
OpenBookQA | OpenBookQA-2736 | astrophysics
Or, in other words, under the inelastic assumption the decrease in velocity per collision is $$~9.79\times10^{-26}\dfrac{m}{s}$$
At 1-2 protons per second, the craft would require ~$10^{26}$ seconds to slow down by 1 meter per second. This is several orders of magnitude greater than the life of the unive... | [
"4000000000000000000000 seconds",
"40 seconds",
"400 seconds",
"4 seconds"
] | A | seconds are used to measure time |
OpenBookQA | OpenBookQA-2737 | If the question is asking for the probability that either of the two cows is 2-coloured, we have
$$P(\text {1 cow is 2-coloured | both visible sides are black}) = \frac{P(\text {1 cow is 2-coloured and other is black}) \times P(\text {the black side of the 2-coloured cow is seen})}{P(\text{both visible sides are black... | [
"fluid",
"seeds",
"fibers",
"skin"
] | B | fruit contains seeds |
OpenBookQA | OpenBookQA-2738 | newtonian-mechanics, newtonian-gravity, universe
Title: What would happen to an object if one was to drop it in intergalactic space? This might be a dumb question but i was confused as to what would happen if one was to somehow drop an object in intergalactic space. For example when something is dropped on earth it fa... | [
"it will start moving with acceleration",
"it will make a loud noise",
"spontaneously teleport a light year away",
"remain in the same location"
] | A | a rocket engine is used to produce thrust by pushing gases out at a high speed |
OpenBookQA | OpenBookQA-2739 | food, nutrition
Supplements aren't intended to be a food substitute because they can't replicate all of the nutrients and benefits of whole foods, such as fruits and vegetables.
and there are three main differences:
Greater nutrition. Whole foods are complex, containing a variety of
the micronutrients your body need... | [
"organism charts",
"water",
"sunlight",
"critters"
] | D | having food has a positive impact on an organism 's health |
OpenBookQA | OpenBookQA-2740 | rocks, remote-sensing, archaeology, ground-truth
Together, #1, #2, and #3 tell us that it's probably early summer just after the river ice has broken up.
The tooth-like features in the left image are simply erosional remnants sticking out of the riverbank. They could be bedrock (not likely), ice wedges, unmelted perm... | [
"black holes",
"Pine",
"time travel",
"emotions"
] | B | if a tree is located near a sidewalk then the roots of that tree might crack the sidewalk |
OpenBookQA | OpenBookQA-2741 | botany, plant-physiology, plant-anatomy
It made me wonder if we are simulating the sun in a dark room for growing the plants with the help of red, blue, and a little bit of far-red light, what will happen to the plants if we keep the ideal conditions for which the plants carry out photosynthesis whole day? Does it aff... | [
"put them in a fire pit",
"put them in a glass pile",
"put them in an igloo",
"put them in a glass building"
] | D | a greenhouse is used to protect plants by keeping them warm |
OpenBookQA | OpenBookQA-2742 | we simply assume that (a, b) and (b, a) are in the relation, and then we show that a = b. Consider the ≥ relation. As it turns out, the relation 'is divisible by' on the integers is an antisymmetric relation. Spanish Grammar: Describing People and Things Using the Imperfect and Preterite, Talking About Days and Dates i... | [
"Play-Doh can scratch diamond, therefore it is softer",
"Diamond can scratch Play-Doh, therefore Play-Doh is harder",
"Diamond can scratch Play-Doh, therefore diamond is harder",
"Play-Doh can scratch diamond, therefore it is harder"
] | C | if one mineral can scratch another mineral then that other mineral is softer than that one mineral |
OpenBookQA | OpenBookQA-2743 | theory, programming-contest
Title: Are there any (theoretical-esque) computer science "competitions" at Undergrad level similar to Putnam? I have searched for a bit eventually arriving at well known websites like codeforces, atcoder, codewars, codinggame or the various OJs.
They mostly involve solving tasks where usua... | [
"a giraffe eats the highest leaves",
"a bear takes a salmon from the stream",
"a shark eats a tuna that an orca was hunting",
"a slug eats a blade of grass"
] | C | if an animal takes a resource from another animal then that animal competes for resources successfully |
OpenBookQA | OpenBookQA-2744 | zoology, ornithology, ethology, senses, balance
Source: Weimerskirch, H., Bishop, C., Jeanniard-du-Dot, T., Prudor, A. and Sachs, G. (2016). Frigate birds track atmospheric conditions over months-long transoceanic flights. Science, 353(6294), pp.74-78.
PS: You have two questions here, specially after your edit. I sugg... | [
"eruptions",
"merging with background",
"flames",
"blending paint"
] | B | camouflage is used for hiding by animals against predators |
OpenBookQA | OpenBookQA-2745 | optics, everyday-life, reflection
Title: What are natural retro-reflectors? Recently I was on an airplane on a sunny day. The sun was shining on the other side of the plane and noticed a bright patch on the ground following beside us. Eventually I noticed a dark centre to this bright patch, the plane's shadow, which ... | [
"light edibles",
"dirt",
"solar heat",
"sunbeams"
] | D | if an object is blue then that object reflects only blue light |
OpenBookQA | OpenBookQA-2746 | statistical-mechanics, atmospheric-science, density
A limnic eruption, also referred to as a lake overturn, is a rare type of natural disaster in which dissolved carbon dioxide (CO2) suddenly erupts from deep lake waters, forming a gas cloud that can suffocate wildlife, livestock and humans. Such an eruption may also ... | [
"propagate",
"stagnate",
"crash",
"stall"
] | A | as the available water in an environment increases , the populations of organisms in that environment will increase |
OpenBookQA | OpenBookQA-2747 | paleontology, fossils, desert
Title: Why are many fossils found in deserts? Why are deserts famous for fossils? Is it a coincidence? Some examples:
Giant Catfish Fossil Found in Egyptian Desert
Chile's stunning fossil whale graveyard explained
Giant Dinosaur Fossil Found in Sahara Desert I would contend that the fact ... | [
"it can eat bugs and withstand very cold weather",
"it can eat fish and withstand very cold weather",
"it can eat bugs and withstand very hot weather",
"it can eat fish and withstand very cold weather"
] | C | some lizards live in desert habitats |
OpenBookQA | OpenBookQA-2748 | atmospheric-chemistry
But some researchers have argued it does make a notable contribution in the lower atmosphere, but indirectly. There doesn't appear to be a consensus on how big this effect is (and the Wikipedia reference is old and obsolete). The argument for ozone being a notable contributor is based on the foll... | [
"using styrofoam",
"pedaling forward",
"driving cars",
"smoking cigarettes"
] | B | riding a bike does not cause pollution |
OpenBookQA | OpenBookQA-2749 | species-identification, invertebrates
Title: Identification of odd jellyfish-like creature in the Mediterranean My parents encountered this unknown creature on a beach in Karpathos, Greece.
None of the locals have seen it before, it may be a species that has moved further north due to ocean warming.
Any ideas what it ... | [
"rushing streams",
"backyard ponds",
"clam filled waters",
"local pools"
] | C | coral lives in the ocean |
OpenBookQA | OpenBookQA-2750 | botany, plant-physiology, plant-anatomy
It made me wonder if we are simulating the sun in a dark room for growing the plants with the help of red, blue, and a little bit of far-red light, what will happen to the plants if we keep the ideal conditions for which the plants carry out photosynthesis whole day? Does it aff... | [
"Comfort them",
"replicate sunlight",
"Protect from bugs",
"Keep plants warm"
] | B | a plant requires sunlight to grow |
OpenBookQA | OpenBookQA-2751 | the-moon, earth, angular-diameter
I should mention that these calculations assume the the Earth and Moon are perfect spheres, separated by a constant distance. In reality, none of those things are true, so the true angular sizes of the Earth and Moon are a little different to what I've calculated above.
As ProfRob say... | [
"twelve",
"three",
"one",
"six"
] | B | the moon is the celestial object that is closest to the Earth |
OpenBookQA | OpenBookQA-2752 | human-biology, cell-biology
Title: Body's decomposition Does a human body decompose in a completely sterile environment ? If yes, what decomposes it ? And how fast ? What happens in vacuum ? Can it remain exactly the same ?
Thanks
Does a human body decompose in a completely sterile environment ?
No it wont. Unstable... | [
"environment",
"play",
"home",
"army"
] | A | decomposer is a kind of role in an ecosystem |
OpenBookQA | OpenBookQA-2753 | zoology, physiology, brain, ethology, behaviour
Vallortigara, G., Rogers, L. J. & Bisazza, A. (1999). Possible evolutionary origins of cognitive brain lateralization. Brain Research Reviews, 30, 164–175.
Wells, D. L., & Millsopp, S. (2009). Lateralized behaviour in the domestic cat, Felis silvestris catus. Animal Beh... | [
"learned",
"found",
"intuitive",
"useless"
] | C | an animal knows how to do instinctive behaviors when it is born |
OpenBookQA | OpenBookQA-2754 | ocean, ocean-currents, tides
Physical effects, then, are likely to include direct effects on current speed, sediment, and stratification.
The obvious possible biological effect is from collisions. This is not my field, but as I understand it no effect is likely on small fish populations from collisions, although indiv... | [
"they are hungry",
"they are symbiotic",
"they are starving",
"they are delicious"
] | B | remora fish eat food by attaching themselves to sharks and eating the food left behind |
OpenBookQA | OpenBookQA-2755 | Iv found the co-ordinates of Q relative to P at t=0
---->X=(10,10)km
iv also found the velocity of Q relative to P----> V= V[Q] -V[P]
-----.V= (0,40) - V(30,0)
----- V= (-30,40)km/h
4. Originally Posted by dopi
A ship P is travelling due East at 30 km/h and a Ship Q is travelling due South at 40 km/h.
Both ships keep... | [
"predictable",
"unpredictable",
"waterproof",
"tradition"
] | A | Earth 's magnetic patterns are used for finding locations by animals that migrate |
OpenBookQA | OpenBookQA-2756 | reproduction, digestion, sexual-reproduction
Hazardous components of pollen:
Trace amounts of hepatotoxic pyrrolizidine alkaloids were found in pollen of Echium vulgare, E. plantagineum, Senecio jacobaea, S. ovatus, and Eupatorium cannabinum (Boppre et al., 2008). In Middle and Northern Europe these pollens are not ... | [
"sweat",
"poop",
"urine",
"blood"
] | B | plant requires seed dispersal for reproduction |
OpenBookQA | OpenBookQA-2757 | hygiene, food-chemistry
Dishes and utensils are only susceptible to bacterial growth if there's traces of food on them. Washing is meant to remove traces of food and oil so bacteria can't multiple on them. The conditions must be right for bacteria to multiple. If traces of food were to be completely dry and hardened o... | [
"low",
"nil",
"extreme",
"zero"
] | C | cooking food to proper temperatures protects against food poisoning by killing bacteria and viruses |
OpenBookQA | OpenBookQA-2758 | homework-and-exercises, thermodynamics, thermal-radiation, thermoelectricity
Title: The thermal expansion of material The question is that: they drill a hole in the middle of a metal. Then when this metal is heated, will the hole become larger or smaller? The hole will get bigger, by experiment, but I think that when ... | [
"nutriment",
"pipes",
"flounder",
"conversation"
] | A | an organism requires energy for growth |
OpenBookQA | OpenBookQA-2759 | mycology
Does this mean that not only is going to the swimming pool not a cure of fungal infections, but it is actually the cause? Well, maybe not. While the articles show that there is a larger incidence of fungal infections among swimmers, they only show correlation, not causality. People who partake in sports activ... | [
"people go to the movies",
"field fluid drips down",
"humans enjoy eating meat",
"some cattle eat cheese"
] | B | runoff is when cropland water enters bodies of water |
OpenBookQA | OpenBookQA-2760 | evolution, zoology
Let's say the environmental challenge for two different kinds of carnivore (let's call them Bogs and Dats) is to catch Mophers. Both Bogs and Dats initially have the same medium-to-short muzzles. Some Bog individuals figure out that they can dig Mophers out of their burrows, and some Dat individu... | [
"long curly hair",
"round ears",
"four wings",
"rainbow stripes"
] | B | mice live in in holes in the ground in fields |
OpenBookQA | OpenBookQA-2761 | acoustics, vacuum, frequency, resonance, vibrations
Title: Resonance and natural vibrations in vacuum In my Physics textbook, it says that if two pendulums of the same natural frequency are placed next to each other and if one is set into vibration, the other starts resonating and when the first one gets damped due to... | [
"soda cans",
"dog food",
"baseball caps",
"violas"
] | D | vibrating matter can produce sound |
OpenBookQA | OpenBookQA-2762 | physical-chemistry, acid-base, equilibrium
*There is perhaps some subtlety here. As an example, consider the salt $\ce{MX}$, which dissociates weakly into $\ce{M+}$ and $\ce{X-}$. The intuition behind the greater degree of dissociation is that (1) upon dilution, the equilibrium constant for dissociation doesn't change... | [
"milk to yogurt",
"mixing marbles",
"my chemical romance",
"shredding paper"
] | A | An example of a chemical change is acid breaking down substances |
OpenBookQA | OpenBookQA-2763 | a) Assuming that the ball starts with Joan,
what is the probability that she will have it back after 2 throws?
$\begin{array}{cccc} & \text{John} & \text{Joan} & \text{Kim} \\
\text{John} & 0 & \frac{1}{3} & \frac{2}{3} \\ \\[-4mm]
\text{Joan} & \frac{1}{2} & 0 & \frac{1}{2} \\ \\[-4mm]
Then: . $A^2 \;=\;\begin{pmatr... | [
"a flock of geese",
"a ton of sand",
"a release of air",
"a release of doves"
] | C | a beach ball contains gas |
OpenBookQA | OpenBookQA-2764 | ros-lunar
Originally posted by alsora with karma: 1322 on 2018-09-08
This answer was ACCEPTED on the original site
Post score: 1
Original comments
Comment by Elric on 2018-09-08:
Thanks a lot. It's an exercise that I have to do in my robotic's subject.
Comment by Elric on 2019-01-22:
Do I need to use Navigation Stack... | [
"electricity",
"skittles",
"ethics",
"lava"
] | A | a computer controls a robot |
OpenBookQA | OpenBookQA-2765 | zoology, ethology, behaviour, psychology, death
Strange thought
Organisms that have not evolved the ability to make "conscious choices" cannot decide to end their life. You will be hard-pressed to find any scientific data on this question. Psychology in humans is already a difficult study, at times failing to demonstr... | [
"watched TV",
"cried",
"perished",
"laughed"
] | C | if a living thing dies then that living thing is dead |
OpenBookQA | OpenBookQA-2766 | the-moon, earth, light, satellite
Title: Why does the Moon appear gray when passing between the Sun and the Earth? Shouldn't the Moon appear as bright as a full Moon seen at midnight from Earth?
The photo was taken by DSCOVR at Lagrange point 1.
In the picture, The Moon appears dark gray. Of course the Earth appears ... | [
"Narwhales",
"Fairies",
"dead volcanoes",
"Unicorns"
] | C | the moon 's surface contains highlands |
OpenBookQA | OpenBookQA-2767 | gravity, earth
This is not enough to send iMerchant into space. However, a component $g_\mathrm{spin} \sin\theta = 4.9\,\mathrm{m}\,\mathrm{s}^{-2}$, or roughly half a G, would point horizontally toward South, enough to send him tumbling down the street, or at least walk awkwardly.
The following is multiple choice qu... | [
"dark angel wings",
"burning rocket fuel",
"using paparazzi cameras",
"using foot levers"
] | D | pushing on the pedals of a bike cause that bike to move |
OpenBookQA | OpenBookQA-2768 | astronomy, everyday-life, popular-science, climate-science
Title: Why is the summer, in the temperate latitudes, in average, hotter that the spring? It is common knowledge that the transition from the Spring to the Summer season occurs in the Summer Solstice when the "Sun reaches its highest excursion relative to the ... | [
"twelve weeks",
"three years",
"nine months",
"two days"
] | A | a new season occurs once per three months |
OpenBookQA | OpenBookQA-2769 | zoology, ornithology, ethology, behaviour
Title: Crow branch pecking behaviour I was walking through a small park when two crows started cawing at me, and followed me, flying from tree-to-tree as I walked. I speculate that this is a territorial or protective behaviour, but what I found different was the crows were vio... | [
"munches on some berries",
"it fulfills its role",
"orders something it likes",
"kills a small deer"
] | B | producer is a kind of role in the food chain process |
OpenBookQA | OpenBookQA-2770 | Let $P_k$ denote the event that she is poisoned with the $k$th cup.
Since there are four cups, of which just one contains poison, the probability that she is poisoned with her first cup is $$\Pr(P_1) = \frac{1}{4}$$
To be poisoned with the second cup, she must not have been poisoned with the first cup and then be poi... | [
"their own nutrients",
"grow in space",
"ride horses",
"enter singing competitions"
] | A | plant cells can perform photosynthesis |
OpenBookQA | OpenBookQA-2771 | entomology, ethology, habitat
Title: Preferred criteria for new bee colony location As a human I want a house with a roof, indoor plumbing, bug free, and make my wife happy. I don't want to drive too far to work, and it has to be well-suited for offspring.
What are the criteria that define a "good spot" for a new loc... | [
"space cadet",
"smaller ones",
"bigger ones",
"dead ones"
] | C | as the size of a flower increases , the number of pollinators it will attract increases |
OpenBookQA | OpenBookQA-2772 | optics, electromagnetic-radiation, visible-light, reflection, geometric-optics
Title: We know that a window can actually reflect light. But if the window has some dirt sticking to it, the image we see sometimes get magnified. Why? Well, I was traveling in a bus yesterday and saw this occur. The board that separates th... | [
"reflection",
"refraction",
"evaporation",
"condensation"
] | D | a phase change is when matter changes from one state into another state |
OpenBookQA | OpenBookQA-2773 | human-biology, respiration
Title: Surviving only on another's exhales? While reading this - Surviving under water in air bubble - this question came to me:
How long can an adult person survive on breathing in only exhales of another adult person? Can this be even calculated by not relying on rough approximations or th... | [
"buried animals",
"living animals",
"stuffed animals",
"rocks"
] | B | all animals breathe |
OpenBookQA | OpenBookQA-2774 | physical-chemistry, everyday-chemistry, thermodynamics
As a comparison to this example, let's check out two liquids that do mix.
3. Water and ethanol
For the water, we have basically the same situation as before -- water molecules forming good bonds to each other. The ethanol, though, has an -OH group that can form bo... | [
"salt and oyster crackers",
"lettuce and roma tomato",
"coffee and hazelnut cream",
"whole milk and cheese"
] | C | An example of combining two substances is pouring one substance into the other substance |
OpenBookQA | OpenBookQA-2775 | javascript, optimization, portability, parallax
curPos.top += yStep;
}
if (curPos.top > followPos.top && (yStep >= 0 ? curPos.top > minY : curPos.top < maxY)) {
curPos.top -= yStep;
}
$(jstr).css({ "left": curPos.left, "top": curPos.top });
}, upd... | [
"something is pulled",
"something is ravaged",
"something is burned",
"something is gold"
] | A | a pulley is used to lift a flag on a flagpole |
OpenBookQA | OpenBookQA-2776 | pressure, ideal-gas, evaporation, humidity, condensation
This has important applications in really understanding how things fully work like heat pumps, air dryers, food processing plants, electronics manufacturing, and more.
The following is multiple choice question (with options) to answer.
Where would you point to ... | [
"the beads on a cold root beer can",
"the pens leaking ink",
"the vapor rising from the coffee",
"the sprinkler system above"
] | A | beads of water are formed by water vapor condensing |
OpenBookQA | OpenBookQA-2777 | One important takeaway here is that we're not thinking of "implies" in terms of causality or possibility. If you want to talk about such things, we have to go beyond propositional logic - modal logic is a good place to set up shop.
Any if-then statement beginning with "If" and then something that has a value of False ... | [
"thunder and lightning indicate that there will be acid rain",
"wind indicates a chance of rain",
"fire indicates that there will be rain",
"thunder and lightning indicate a great chance of rain"
] | D | if weather is stormy then there is a greater chance of rain |
OpenBookQA | OpenBookQA-2778 | biophysics, theoretical-biology, ecosystem
Systems ecology, especially with regard to energy and nutrient flow.
This type of ecology can be strongly influenced by physics. For one example see the book Theoretical Ecosystem Ecology: Understanding Element Cycles by Ågren & Bosatta (Ågren was originally a physicist)
Phys... | [
"are made up of many plants and lack living animals",
"are communities with a plethora of living beings",
"only contain animals of the same species",
"are present only on certain continents"
] | B | an ecosystem contains large numbers of living organisms in a particular place |
OpenBookQA | OpenBookQA-2779 | wildfire
There are detailed satellite imagery with PM2.5 monitor overlay at Aerosol Watch, if you would like to see how the event progressed through time.
The following is multiple choice question (with options) to answer.
The more often wildfires take place on a space of land, the more often we will see | [
"animal groups in decline",
"animal populations growing larger",
"more birds moving in",
"larger deer starting families"
] | A | as the supply of food in an environment decreases , the population of animals in that environment will decrease |
OpenBookQA | OpenBookQA-2780 | photosynthesis, cellular-respiration, energy, sugar
Basically, points 4-7 convey that Calvin-Benson cycle not only produces sugar but what it actually does is fix inorganic carbon (as CO2) to organic form (in the form of sugar). So, most (practically all) of the carbon that a photosynthetic plant has, comes from this ... | [
"Babies",
"Love Handles",
"Belly",
"sustenance"
] | D | sugars are transported from the leaves to the roots of a plant |
OpenBookQA | OpenBookQA-2781 | anatomy, scales
If this horse is 500 kg (a mid-range mass for horses), each leg would have to support 125 kg, compared to only 37.5 kg for a 75 kg adult. Why don't we see a corresponding difference in cross-section? Elephant, rhinoceros, &c all have much thicker legs in proportion. The answer, I think, lies in the fa... | [
"her mom was very old",
"his hair is blonde",
"her arms are wide",
"his ancestors had the same"
] | D | the thickness of the parts of an organism is an inherited characteristic |
OpenBookQA | OpenBookQA-2782 | zoology, ornithology, ethology, behaviour
Title: Crow branch pecking behaviour I was walking through a small park when two crows started cawing at me, and followed me, flying from tree-to-tree as I walked. I speculate that this is a territorial or protective behaviour, but what I found different was the crows were vio... | [
"shooting them as they come",
"cutting their hair at night",
"leaving lids off garbage cans",
"putting garbage cans inside the garage"
] | C | raccoons eat waste |
OpenBookQA | OpenBookQA-2783 | electromagnetism, geophysics, geomagnetism
Title: Why is modelling the Earth as having geomagnetic poles useful? I'm reading about geomagnetic poles and wondering what their signifcance is. It seems one (and perhaps the main) purpose of using this type of model is for understanding the aggregation of magnetic particle... | [
"needles will glow in the dark because of them",
"needles will stab them",
"some poles will be radioactive",
"needles aim that way"
] | D | a compass 's needle lines up with Earth 's magnetic poles |
OpenBookQA | OpenBookQA-2784 | Conversely, suppose $n=2^m\cdot \gcd(a_0,b_0,c_0)$. We can solve the puzzle as follows. If the current state is $\{a,b,c\}$, write $a=2^x a'$, $b=2^y b'$, $c=2^z c'$, where $a'$, $b'$, and $c'$ are odd. The condition on $n$ implies that either $a=b=c$, or that of the three numbers $x$, $y$, and $z$, two will be equal a... | [
"fields are useless",
"dirt is refreshed",
"sand is dried",
"water is poisoned"
] | B | crop rotation renews soil |
OpenBookQA | OpenBookQA-2785 | organic-chemistry
Title: What are the minimal chemical requirements for a food which we all can eat? I've been puzzled by the following though experiment for the past few days:
I want to make my own food from scratch, but I do not know where to start from.
I want to be 100% sure that what I eat will never contains som... | [
"oxygen",
"animal toys",
"rays",
"weaker bugs"
] | D | consumers eat other organisms |
OpenBookQA | OpenBookQA-2786 | earth-history, mass-extinction, geobiology, evolution, ecology
Title: Why haven't weeds overtaken the entire planet? Given how rapidly weed plants spread and grow, choking out all other plant life, how come after millions of years we haven't ended with forests full of thistle or pokeweed, as opposed to pines or oak tr... | [
"crows show up",
"humans see it",
"worms live there",
"vegetables are farmed"
] | D | farming changes the environment |
OpenBookQA | OpenBookQA-2787 | thermodynamics, combustion
Title: Recovering mechanical energy from natural gas water boiler Is there any heat energy lost to the mechanical force of pushing a piston in a combustion engine?
In other words, would a natural gas burning as a flame produce more heat than the same amount of natural gas that was burned whe... | [
"snow",
"a warmer room",
"oxygen",
"water"
] | B | natural gas is a source of heat by burning |
OpenBookQA | OpenBookQA-2788 | Best Japanese Brown Rice, Air Fryer Burgers And Fries, østfold University College Vacancies, Band T-shirts Walmart, How To Become An Anglican Priest, Too Much Fennel Taste, Porter Cable Circular Saw Cordless, Utmb My Chart, Iams Large Breed Dog Food Nutrition Facts,
The following is multiple choice question (with opti... | [
"serves it hot",
"breaks it down",
"losses energy",
"dies"
] | B | break down means change from a whole into pieces |
OpenBookQA | OpenBookQA-2789 | thermodynamics
Based on this page in a “Blaze” book, my six year old asked “which would win?” between water and lava. On further investigation, we refined the question to: which would turn solid first in similar conditions, a liter of room temperature water or a liter of volcanic lava? You've got the right idea — you ... | [
"seawater",
"refrigerators",
"air conditioning",
"glaciers"
] | A | new land can be formed by volcanoes erupting by lava cooling |
OpenBookQA | OpenBookQA-2790 | human-biology, cancer, medicine
Title: Why are only few cigarette smokers prone to cancer? It's tacit that only a few populace of smokers get cancer. What spares the others from it or what specifically cause cancer in those populace? See this Washington Post Article Cigarette smokers are most certainly prone to cancer... | [
"wizards",
"space",
"Jonny and Susie",
"unicorns"
] | C | smoking causes direct damage to the lungs |
OpenBookQA | OpenBookQA-2791 | civil-engineering
Other things that can be done is to place hay bales, or rocks, on the soil slope and on the slope above the deposited soil. These can help to reduce the speed of surface water running down the slope.
If hay bales are used they should be placed in a staggered, off-set pattern, so that long drainage ch... | [
"Give me a hair cut",
"Create a beautiful painting",
"turn a statue to dust",
"Clean my car windows"
] | C | wind causes erosion |
OpenBookQA | OpenBookQA-2792 | theoretical-biology, hematology, red-blood-cell
**As an intern, I once had the very sorrowful experience of admitting an healthy appearing, exuberant 4 year old child to the pediatric surgical service. The only presenting symptom was that the child started squatting during exertion (not good), and on exam, had a murmu... | [
"foil",
"wood",
"steel",
"oil"
] | A | tearing means changing a whole into pieces |
OpenBookQA | OpenBookQA-2793 | entomology
Title: What is the name of this tiny creature? It looks like a tiny piece of moving cotton? By chance, I saw this tiny insect on my bag a few days ago in Sydney. Am I the first person who has pinpointed this animal?! If not can you please let me know its name? From your image, it looks like it might be a wo... | [
"JDZ clones",
"mushroom farmers",
"garbage eaters",
"trash removers"
] | C | decomposition increases amount of organic matter in soil |
OpenBookQA | OpenBookQA-2794 | sleep, hearing, perception
Title: What is the term for awareness of or inclusion of real sounds within a dream? I fell asleep while listening to a podcast, and I am sure I was dreaming but I could also still hear the podcast.
The podcast played an important role in the dream, I was searching for the source of the voi... | [
"gas in the stove",
"water in the walls",
"atmosphere in the space",
"water in the ears"
] | C | sound can travel through air |
OpenBookQA | OpenBookQA-2795 | special-relativity
$$ t' = (t-v\cdot x/c^2)/sqrt(1-v^2/c^2) $$
It's the $v\cdot x$ term in the numerator that causes the mischief here. In the runner's frame the more distant event (larger $x$) happens earlier. The far door is closed first. It opens before she gets there, and the near door closes behind her. Safe ... | [
"a clear road path",
"a dry clear road",
"a road full of ice",
"a road without hills"
] | C | skidding causes speed to decrease |
OpenBookQA | OpenBookQA-2796 | algorithms, reference-request, distributed-systems
I'm not aware of any literature on this and I don't particularly see any reason to expect there to be any. It's a very specific set of requirements, and it looks to me like the resulting task is either trivial or impossible to solve. Those usually aren't the kind of... | [
"knobs",
"bricks",
"panels",
"droplets"
] | D | water is a renewable resource |
OpenBookQA | OpenBookQA-2797 | zoology, pathology, herpetology
Title: How do pet gecko lizards pose a health risk? Does having gecko lizards living in your house pose any health risk? If you're referring to keeping geckos as pets, like all reptiles, amphibians and birds, they come with a small but finite risk of contracting salmonellosis. Having sa... | [
"live house flies",
"a dog",
"plant fertilizer",
"snakes"
] | A | a salamander eats insects |
OpenBookQA | OpenBookQA-2798 | spacetime, velocity, space-expansion, dark-energy, galaxy-clusters
Also, I found this Forbes article by one of the authors to be particularly good at explaining in layman's terms the question of what a "repeller" means, when gravity is purely attractive.
The concept of a low-mass region of mostly void pushing things s... | [
"shape",
"luster",
"a trajectory",
"color"
] | C | gravity causes orbits |
OpenBookQA | OpenBookQA-2799 | species-identification, marine-biology
Title: help identify this fish
I came across this washed up fish in Panama City, Florida in November 2015. I'm guessing it's a puffer fish but I can't find anything like it online.
Thanks. This is a kind of trunkfish. (They have different names, this could be a smooth or spotte... | [
"cannibals",
"fairies",
"grapes",
"unicorns"
] | A | predators eat prey |
OpenBookQA | OpenBookQA-2800 | beam
all the distances are positive (everything is either above or to the right of $A$)
the horizontal distributed load is positive
the vertical loads are negative
$F_{E,y}$ is whatever it will be (positive, in our case)
When calculating the moment due to vertical forces, the sign is positive
When calculating the mome... | [
"snakes",
"magnitude",
"water",
"frames"
] | B | gravitational force causes objects that have mass to be pulled down on a planet |
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