In light of what we know about geological activity on the terrestrial worlds, why might it seem surprising to find geological activity on jovian moons?
a. because some of them have orbital resonances with other moons
b. because they rotate slowly
c. because they are relatively small in size
d. because they are moons, not planets
e. because they are far from the Sun
Ans: c. because they are relatively small in size
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What is the Asteroid belt?
A. a line of craters on the Moon caused by an asteroidal impact about 50 million years ago B. the place in the Solar System where most of the asteroids are found C. a line of craters on Earth caused by an asteroidal impact about 50 million years ago D. a term used to describe the impact of a very large asteroid with a planet E. None of these choices is correct.
A spring with spring constant k = 800 N/m is extended 12 cm from its equilibrium position. A spring with 6.0 cm extension from equilibrium will have the same potential energy as the first spring if its spring constant is
a. 200 N/m. b. 400 N/m. c. 800 N/m. d. 1 600 N/m. e. 3 200 N/m.
A 500 nm light is reflected constructively from a thin layer of oil of index of refraction 1.25, which rests on the top of water of index of refraction 1.33. What is the minimum thickness of the layer of oil?
A) 100 nm B) 150 nm C) 175 nm D) 200 nm E) 225 nm
By how many newtons does the weight of a 100-kg person change when he goes from sea level to an altitude of 5000 m? (The mean radius of the Earth is 6.38 × 106 m.)
A) 0.6 N B) 1.6 N C) 2.6 N D) 3.6 N E) 5.2 N