When a solid melts, energy is

A) absorbed by the solid.
B) released by the solid.
C) both of these
D) neither of these


Answer: A

Physics & Space Science

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Venus may have started with an ocean's worth of water. Where is its water now?

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A block is supported on a compressed spring, which projects the block straight up in the air at velocity  . The spring and ledge it sits on then retract. You can win a prize by hitting the block with a ball. When should you throw the ball and in what direction to be sure the ball hits the block? (Assume the ball can reach the block before the block reaches the ground and that the ball is thrown from a height equal to the release position of the block.)

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One of the "nails in the coffin" for the Earth-centered universe was

A) the retrograde motion of the planets. B) Galileo's observation of stars in the Milky Way. C) eclipses of the Sun. D) Galileo's observations of the moons of Jupiter. E) the phases of the Moon.

Physics & Space Science

In a plot of probability of finding the electron in the hydrogen ground state versus the distance from the nucleus, the maximum occurs

a. at a0, the first Bohr radius. b. at slightly less than a0. c. at slightly more than a0. d. at 2 a0.

Physics & Space Science