When we see them in the night sky, which of the following objects are emitting their own light?
A. Mars
B. the Sun
C. the Moon
D. Venus
E. All of these choices are correct.
Answer: B
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Suppose you have two capacitors and want to use them to store the maximum amount of energy by connecting them across a voltage source. You should connect them
A) in parallel across the source. B) in series across the source. C) It doesn't matter because the stored energy is the same either way.
A hydrogen atom consists of a single proton and a single electron. If the distance between the proton and the electron were doubled, the electric force would be
1) 1/4 as much, 2) 1/2 as much, 3) twice as much, 4) not enough information to say, and if instead the distance between the electron and proton were halved, the electric force would be 5) 1/4 as much. 6) 1/2 as much. 7) twice as much. 8) four times as much. 9) not enough information to say
Why does the Moon have a layer of "powdery soil" on its surface?
A) It is the result of countless tiny impacts by small particles striking the Moon. B) Recent, large impacts shattered lunar rock to make this soil. C) It is made by the same processes that make powdery sand on Earth. D) It exists because the Moon accreted from powdery material after a giant impact blasted the Earth.
In the context of Schwarzschild black holes, the _____ is the boundary between the isolated volume of space-time and the rest of the Universe
A) bridge fragment B) event horizon C) pulsating point D) status curve