During the heavy bombardment early in the solar system's history,
a. giant craters were made on the Moon.
b. giant craters were made on Mercury.
c. giant craters were made on Earth.
d. all of the above.
Answer: d. all of the above.
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The difference in blood pressure between the head and the foot of a person who is 2.000 m tall and standing up is (density of blood is 1,060 
A. 155.9 mmHg. B. 142.3 mmHg. C. 126.3 mmHg. D. 102.4 mmHg. E. 198.3 mmHg.
On a scale where the distance from Earth to the Sun is about 15 meters, the distance from Earth to the Moon is
A) small enough to fit within your hand. B) about 1 meter. C) about 5 meters. D) about 30 meters.
How do we know that there is much more mass in the halo of our galaxy than in the disk?
A) There are so many globular clusters in the halo that their total mass is greater than the mass of stars in the disk. B) Stars and gas clouds in the outskirts of the Milky Way orbit the galaxy at much higher speeds than we would expect if all the mass were concentrated in the disk. C) We have discovered that the halo is filled with an enormous number of brown dwarfs that have a combined mass much greater than the disk. D) Laboratory experiments have proven that the halo must be full of subatomic dark matter particles.
Two optically flat glass plates, 16.0 cm long, are in contact at one end and separated by 0.0200 mm at the other end. The space between the plates is occupied by oil with index of refraction 1.45. The index of refraction of the glass plates is 1.55
The plates are illuminated at normal incidence with monochromatic light, and fringes are observed. If the dark fringes are spaced 2.00 mm apart, what is the wavelength of the monochromatic light? A) 425 nm B) 475 nm C) 525 nm D) 675 nm E) 725 nm