Two identical arrows, one with twice the kinetic energy of the other, are fired into a bale of hay. Compared with penetration of the slow arrow, the faster arrow penetrates
A) the same distance.
B) twice as far.
C) four times as far.
D) more than four times as far.
E) none of the above
Answer: B
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Enceladus orbits Saturn in a resonance with the larger moon Dione. Each time Dione orbits Saturn once, Enceladus orbits _______________
Fill in the blank(s) with correct word
The Moon appears larger when it rises than when it is high in the sky because
A. it's brighter when it rises. B. you are closer to it when it rises (angular-size relation). C. it's an illusion from comparison to objects on the horizon. D. you are farther from it when it rises (angular-size relation).
A chunk of metal has a mass of 1 kg on Earth. If the same chunk were on the Moon its mass would be
A) less. B) the same. C) more.
In solving a physics problem you end up with m in the numerator and m/s in the denominator. The units for your answer are
A) m2/s. B) m2. C) m. D) s. E) 1/s.