Electrical resistance is greater for
A) dry skin.
B) wet skin.
C) both the same
Answer: A
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Release a ball inside a freely falling elevator and it falls directly in front of you instead of "falling to the floor," because you, ball, elevator, and enclosed air are in free fall. If you do the same with a helium-filled balloon, the balloon
A) also remain in front of you. B) press against the ceiling. C) press against the floor. D) slowly rise. E) slowly fall.
An ice skater performs a pirouette (a fast spin) by pulling in his outstretched arms close to his body. What happens to his angular momentum about the axis of rotation?
A) It does not change. B) It increases. C) It changes, but it is impossible to tell which way. D) It decreases.
According to the turn-off points of the oldest globular clusters, they are about
A) 4.5 billion years old. B) 6.8 billion years old. C) 10 billion years old. D) 12 billion years old. E) 16 billion years old.
According to the second law of thermodynamics, the entropy of any system always increases
A) True B) False