Q: The core of a star collapses during what event, forming a neutron star? Read this paragraph and choose the correct option from the provided answers: The average particle energy needed to observe 19 GeV . (a) What unification of forces is estimated to be 10 is the rest mass in kilograms of a particle that has a rest mass 19 of 10 GeV/c 2 ? (b) How many times the mass of a hydrogen atom is this? 14. The peak intensity of the CMBR occurs at a wavelength of 1.1 mm. (a) What is the energy in eV of a 1.1-mm photon? (b) 9 There are approximately 10 photons for each massive 9 particle in deep space. Calculate the energy of 10 such photons. (c) If the average massive particle in space has a mass half that of a proton, what energy would be created by converting its mass to energy? (d) Does this imply that space is "matter dominated"? Explain briefly. (a) What Hubble constant corresponds to an approximate 10 age of the universe of 10 y? To get an approximate value, assume the expansion rate is constant and calculate the speed at which two galaxies must move apart to be separated by 1 Mly (present average galactic separation) in a time of 10 10 y. (b) Similarly, what Hubble constant corresponds to a 10 universe approximately 210 -y old? 16. Show that the velocity of a star orbiting its galaxy in a circular orbit is inversely proportional to the square root of its orbital radius, assuming the mass of the stars inside its orbit acts like a single mass at the center of the galaxy. You may use an equation from a previous chapter to support your conclusion, but you must justify its use and define all terms used. The core of a star collapses during a supernova, forming a neutron star. Angular momentum of the core is conserved, and so the neutron star spins rapidly. If the initial core radius 5 is 5.010 km and it collapses to 10.0 km, find the neutron star's angular velocity in revolutions per second, given the core's angular velocity was originally 1 revolution per 30.0 days. Using data from the previous problem, find the increase in rotational kinetic energy, given the core's mass is 1.3 times that of our Sun. Where does this increase in kinetic energy come from? 19.... Choices: - spark - blast - gravitational - supernova A:
supernova

(Question)
Q: What term is used to describe the ability to change or move matter? Read this paragraph and choose the correct option from the provided answers: Everything you do takes energy. Energy is the ability to change or move matter. Whether it's reading these words or running a sprint, it requires energy. In fact, it takes energy just to stay alive. Where do you get energy? You probably know the answer. You get energy from food. Figure {{ref|MS-LS-SE-02-03-Food|below}] shows some healthy foods that can provide you with energy. Choices: - mass - inertia - speed - energy A:
(Answer)
energy

Ques: Q: Recent fossil evidence has shown that the evolutionary divergence of what group from other land animals was characterized by streamlining and simplifying the digestive system, which allowed a high metabolic rate? Read this paragraph and choose the correct option from the provided answers: Avian Adaptations Birds have a highly efficient, simplified digestive system. Recent fossil evidence has shown that the evolutionary divergence of birds from other land animals was characterized by streamlining and simplifying the digestive system. Unlike many other animals, birds do not have teeth to chew their food. In place of lips, they have sharp pointy beaks. The horny beak, lack of jaws, and the smaller tongue of the birds can be traced back to their dinosaur ancestors. The emergence of these changes seems to coincide with the inclusion of seeds in the bird diet. Seed-eating birds have beaks that are shaped for grabbing seeds and the two-compartment stomach allows for delegation of tasks. Since birds need to remain light in order to fly, their metabolic rates are very high, which means they digest their food very quickly and need to eat often. Contrast this with the ruminants, where the digestion of plant matter takes a very long time. Ruminants Ruminants are mainly herbivores like cows, sheep, and goats, whose entire diet consists of eating large amounts of roughage or fiber. They have evolved digestive systems that help them digest vast amounts of cellulose. An interesting feature of the ruminants' mouth is that they do not have upper incisor teeth. They use their lower teeth, tongue and lips to tear and chew their food. From the mouth, the food travels to the esophagus and on to the stomach. Choices: - fish - rats - marsupials - birds A:
Ans: birds

(Q).
Q: Melanocytes are located in which layer of the epidermis? Read this paragraph and choose the correct option from the provided answers: Melanocytes are located at the bottom of the epidermis. Choices: - follicle - outer - crust - bottom A:
(A).
bottom

Ques:Q: A very small artery that leads to a capillary is known as what? Read this paragraph and choose the correct option from the provided answers: Arterioles An arteriole is a very small artery that leads to a capillary. Arterioles have the same three tunics as the larger vessels, but the thickness of each is greatly diminished. The critical endothelial lining of the tunica intima is intact. The tunica media is restricted to one or two smooth muscle cell layers in thickness. The tunica externa remains but is very thin (see Figure 20.4). With a lumen averaging 30 micrometers or less in diameter, arterioles are critical in slowing downor resistingblood flow and, thus, causing a substantial drop in blood pressure. Because of this, you may see them referred to as resistance vessels. The muscle fibers in arterioles are normally slightly contracted, causing arterioles to maintain a consistent muscle tonein this case referred to as vascular tonein a similar manner to the muscular tone of skeletal muscle. In reality, all blood vessels exhibit vascular tone due to the partial contraction of smooth muscle. The importance of the arterioles is that they will be the primary site of both resistance and regulation of blood pressure. The precise diameter of the lumen of an arteriole at any given moment is determined by neural and chemical controls, and vasoconstriction and vasodilation in the arterioles are the primary mechanisms for distribution of blood flow. Choices: - capillary junction - vein - arterium - arteriole A:

Ans:arteriole

Q: Energy from the sun has a wide range of wavelengths.what is the total range of energy called? Read this paragraph and choose the correct option from the provided answers: Energy from the Sun has a wide range of wavelengths. The total range of energy is called the electromagnetic spectrum . You can see it in Figure below . Choices: - heat spectrum - light spectrum - thermal spectrum - electromagnetic spectrum A:
electromagnetic spectrum