How are surfaces of Mercury and the Moon similar? Different? Why?
What will be an ideal response?
Both are airless worlds with many ancient impact craters. On our Moon, the tides of Earth drew out the mare on the Earth side, while Mercury's lava flows were much less extensive than the mare. But as its core cooled and shrank, Mercury's crust developed huge scarps, great wrinkles that run for hundreds of miles.
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Infrared observations are used to determine the mass of asteroids because ________.
A. most asteroids are made of dark minerals which are more efficient at reflecting infrared light than visible light B. the Hubble Space Telescope only has infrared cameras C. the infrared radiation is the glow of heat from the asteroid, and larger asteroids emit more infrared light D. asteroids reflect too little visible light to use optical telescopes for the measurements
The principle stating that the work output of a heat engine must be less than its total energy input is called
A) the second law of thermodynamics. B) the kinetic principle. C) the first law of thermodynamics. D) the law of conservation of energy. E) Nonsense--there is no such physical law.
Two simple pendulums, A and B, are each 3.0 m long, and the period of pendulum A is T. Pendulum A is twice as heavy as pendulum B. What is the period of pendulum B?
A) 2T B) T/2 C) T/ D) T E) T
Consider a situation where two moving objects collide and rebound from each other.Linear momentum
a. is definitely conserved. b. is definitely not conserved. c. may or may not be conserved, depending on the nature of the collision. d. none of the above