Astronomers believe that the Moon did not differentiate to the same degree as Earth because:
A) the Moon was made of solid debris, not liquids like our hydrosphere.
B) the meteors that hit the Moon were lighter than those that hit us, so did not generate as much heat on the surface.
C) the less dense and smaller Moon did not have as much radioactivity as the larger Earth in its core.
D) the Moon was formed after the Earth was, so its radioactivity was less.
E) the Moon was made of very different materials than our mantle and crust.
C
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A very massive object A and a less massive object B move toward each other under the influence of gravity. Which force, if either, is greater?
A) the force on A B) the force on B C) both forces are the same.
To determine the height of a bridge above the water, a person drops a stone and measures the time it takes for it to hit the water. If the height of the bridge is 41 m, how long will it take for the stone to hit the water? Neglect air resistance
A) 3.6 s B) 2.3 s C) 2.6 s D) 2.9 s E) 3.2 s
Which of the following is (are) conserved in an isolated system?
1.the kinetic energy alone 2.the potential energy alone 3.both the potential energy and the kinetic energy 4.the sum of the kinetic energy and the potential energy
A 40.0-L container is divided into two equal parts by a rubber membrane. One half of the container has 1.50 moles of an ideal monatomic gas at 250 K, and the other half is a vacuum
The container is well insulated, so there is no exchange of heat with the surroundings. The membrane breaks, and eventually the gas reaches a new equilibrium condition occupying the entire volume. What is the final temperature of the gas? A) 125 K B) 250 K C) 157 K D) 180 K E) 100 K