Q: Which law explains why a ship weighing thousands of metric tons floats on water? Read this paragraph and choose the correct option from the provided answers: Do you see the man sitting on top of this tanker truck? He gives you a sense of how big the truck is. What's behind the truck? Is it a huge apartment complex? It's just as massive as a very large building, but it's not even resting on land. It's a giant cruise ship, and it's floating on water. The ship weighs about 100,000 metric tons. How can such a tremendous weight float on water? Why doesn't it sink to the bottom of the ocean instead? Archimedes' law explains why. Choices: - hofstadter ' law - ganymede ' law - water pressure law - archimedes' law A:
archimedes' law

Q: Surface tension is responsible for the fact that small insects can do this on water? Read this paragraph and choose the correct option from the provided answers: tension causes liquids to form spheres in free fall or zero gravity (see - ball-ch10_s02_f01: the "floating" water isn't in the shape of a sphere by accident; it is the result of surface tension). Surface tension is also responsible for the fact that small insects can "walk" on water. Because of surface tension, it takes energy to break the surface of a liquid, and if an object (such as an insect) is light enough, there is not enough force due to gravity for the object to break through the surface, so the object stays on top of the water ( ball-ch10_s03_f07). Carefully done, this phenomenon can also be illustrated with a thin razor blade or a paper clip. The fact that small droplets of water bead up on surfaces does not mean that wateror any other liquid does not interact with other substances. Sometimes the attraction can be very strong. Adhesion is the tendency of a substance to interact with other substances because of intermolecular forces, while cohesion is the tendency of a substance to interact with itself. If cohesive forces within a liquid are stronger than adhesive forces between a liquid and another substance, then the liquid tends to keep to itself; it will bead up. However, if adhesive forces between a liquid and another substance are stronger than cohesive forces, then the liquid will spread out over the other substance, trying to maximize the interface between the other substance and the liquid. We say that the liquid wets the other substance. Adhesion and cohesion are important for other phenomena as well. In particular, if adhesive forces are strong, then when a liquid is introduced to a small-diameter tube of another substance, the liquid moves up or down in the tube, as if ignoring gravity. Because tiny tubes are called capillaries, this phenomenon is called capillary action. For example, one type of capillary actioncapillary riseis seen when water or water-based liquids rise up in thin glass tubes (like the capillaries sometimes used in blood tests), forming an upwardly curved surface... Choices: - swim - sink - float - walk A:
walk

Q: Q: Why do sodium and chloride ions attract each other? Read this paragraph and choose the correct option from the provided answers: Sodium and chloride ions have equal but opposite charges. Opposites attract, so sodium and chloride ions attract each other. They cling together in a strong ionic bond. You can see this in row 2 of Figure above . Brackets separate the ions in the diagram to show that the ions in the compound do not share electrons. You can see animations of sodium chloride forming at these URLs:. Choices: - sulfides attract - magnetism - like attracts like - opposites attract A:
A: opposites attract

Question: Q: What part of the body are eggs formed in? Read this paragraph and choose the correct option from the provided answers: Eggs form in the ovaries. After puberty, an egg is released from an ovary each month in the process of ovulation. The egg passes through the fallopian tube where fertilization may take place. Choices: - brain - intestine - pancreas - ovaries A:
Answer: ovaries

*Question*
Q: What is a pure substance called? Read this paragraph and choose the correct option from the provided answers: A pure substance is called an element . An element is a pure substance because it cannot be separated into any other substances. Currently, 92 different elements are known to exist in nature, although additional elements have been formed in labs. All matter consists of one or more of these elements. Some elements are very common; others are relatively rare. The most common element in the universe is hydrogen, which is part of Earth's atmosphere and a component of water. The most common element in Earth's atmosphere is nitrogen, and the most common element in Earth's crust is oxygen. Several other elements are described in the musical video at this URL:. Choices: - a mixture - homogeneous matter - a liquid - an element A:
**Answer**
an element

Q: Q: What creatures evolved from a lobe-finned lungfish ancestor? Read this paragraph and choose the correct option from the provided answers: Fossil evidence shows that amphibians evolved about 365 million years ago from a lobe-finned lungfish ancestor. As the earliest land vertebrates, they were highly successful. Some of them were much larger than today's amphibians. For more than 100 million years, amphibians remained the dominant land vertebrates. Then some of them evolved into reptiles. Once reptiles appeared, with their amniotic eggs, they replaced amphibians as the dominant land vertebrates. Choices: - birds - horses - mice - amphibians A:
A: amphibians