If a spinning star gets larger in diameter, what happens to its rotation rate?
A) It increases.
B) It will not change.
C) It decreases.
C) It decreases.
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A ship that weighs 10,000 tons (mass 10 million kg) must displace what volume of fresh water in order to float?
A) 104 m3 B) 107 m3 C) 108 m3 D) 1010 m3 E) 1012 m3
An object is released from rest a height h above the ground. A second object with four times the mass of the first is released from the same height. The potential energy of the second object compared to the first is
A) one-fourth as much. B) one-half as much. C) twice as much. D) four times as much. E) eight times as much.
Which of the following is NOT a unit of pressure?
A) Pascal B) inches of mercury C) psi D) atmosphere E) N-
In a nuclear reactor, the control rods must be able to
A) absorb neutrons. B) absorb 235U. C) slow neutrons down without absorbing them. D) remove the heat from the fissioning uranium. E) absorb 238U.