If a light signal and a radio signal were emitted simultaneously from the Moon, the first signal to reach Earth would be

A) radio.
B) light.
C) both of these
D) none of the above


Answer: C

Physics & Space Science

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An 800 V/m electric field is directed along the +x-axis. If the potential at x = 0 m is 2000 V, what is the potential at x = 2 m?

A) 200 V B) 400 V C) 600 V D) 800 V E) 1000 V

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A. analytics B. benchmarking C. cookies D. hits

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A refrigerator has a performance coefficient (COP) of 1.15, and it extracts 7.95 J of heat from the cold reservoir during each cycle

(a) How much work is done on the gas in each cycle? (b) How much heat is exhausted into the hot reservoir in each cycle?

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The atmosphere of Saturn is composed mostly of

A) methane and ammonia. B) carbon dioxide and ethane. C) hydrogen and helium. D) hydrogen sulfide and ammonia. E) nitrogen and oxygen.

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