On an H-R diagram, a protostar would be
A) below and near the right side of the main sequence.
B) above and to the right of the main sequence.
C) above and near the upper left of the main sequence.
D) below and to the left of the main sequence.
E) on the main sequence at the extreme lower right.
B
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You are holding on to one end of a long string that is fastened to a rigid steel light pole. After producing a wave pulse that was 5 mm high and 4 cm wide, you want to produce a pulse that is 4 cm wide but 7 mm high. You must move your hand up and down once,
A. the same distance up as before, but take a shorter time. B. the same distance up as before, but take a longer time. C. a smaller distance up, but take a shorter time. D. a greater distance up, but take a longer time. E. a greater distance up, but take the same time.
A mass oscillates on the end of a spring, both on Earth and on the Moon. Where is the period the greatest?
A) Earth B) the Moon C) the same on both Earth and the Moon D) Cannot be determined from the information given.
Why might excess CO2 in the atmosphere heat up the earth?
A) Because CO2 reacts with and thus destroys the ozone layer. B) Because CO2 absorbs, or traps, infra-red radiation. C) Because CO2 is an important participant in the photosynthesis process. D) Because CO2 absorbs, or traps, ultra-violet radiation. E) Because CO2 increases Earth's "reflectivity."
While a variety of factors can produce redshifts in the spectrum, the one associated with the expansion of the universe is called:
A) universal. B) cosmological. C) olberian. D) relativistic. E) the Zeeman Effect.