A metallic coin is given a positive electric charge. Its mass:
1.increases measurably.
2.increases by an amount too small to measure directly.
3.remains unchanged.
4.decreases by an amount too small to measure directly.
5.decreases measurably.
4
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Why is it believed that life can not evolve on a planet that orbits a spectral type A, B or O star?
a. These stars produce too much infrared radiation which would destroy carbon-based organisms. b. These stars have very small life zones. c. These stars are not capable of producing planets. d. These stars do not remain on the main sequence long enough for life to evolve. e. These stars take too long to form.
What happens to the frequency of the scattered X-rays beam as the scattering angle in the Compton effect decreases?
A) It stays the same. B) It decreases. C) It increases. D) Not enough information
The idea that we live in a universe (literally, "one story"), in which the same law of gravity applies both on Earth and in space, was established through the work of
A) Newton. B) Copernicus. C) Kepler. D) Galileo.
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Answer the following statement true (T) or false (F)