Which of the following is a remnant of a dying star?
A. neutron star
B. black hole
C. white dwarf
D. All of these choices are correct.
Answer: D
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The planet Neptune is blue in color. How would you expect the spectrum of visible light from Neptune to be different from the visible-light spectrum of the Sun?
A) The two spectra would have similar shapes, except Neptune's spectrum would be missing a big chunk of the red light that is present in the Sun's spectrum. B) The two spectra would have similar shapes, except Neptune's spectrum would be missing a big chunk of the blue light that is present in the Sun's spectrum. C) Neptune's spectrum would peak at a much longer wavelength than the Sun's spectrum. D) There is no way to predict the answer to this question, since planets and stars are made of such different things.
At the moment of a total eclipse, the moon lies along a line from the Earth to the Sun. If your normal weight is 600 N, how much is your weight decreased by the combined pull of the Sun and Moon? MSun = 2.0 × 10^30 kg, rS-E = 1.5 × 10^8 km MMoon = 7.4 × 10^22 kg, rM-E = 3.8 × 10^5 km
A heat pump is used to heat a house in Minnesota in the winter and has half the ideal coefficient of performance for a reversible heat pump. If the outside air temperature is 
and the indoor temperature desired is 
what is its coefficient of performance under these conditions?
A. 3.7 B. 1.1 C. 2.0 D. 4.2
Which of the following is a postulate of special relativity?
A. The laws of physics are the same for all observers in uniformly moving frames of reference B. The relative speed of two objects is the same for all observers C. Physicists can make no measurements in a moving reference frame D. The color of light is the same for all observers