Density is calculated as
A. mass times volume.
B. volume divided by mass.
C. mass divided by volume.
D. mass times gravity.
Answer: C
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Which statement about the cosmic microwave background is not true?
A) It is the result of a mixture of radiation from many independent sources, such as stars and galaxies. B) Its spectrum has the shape of an essentially perfect thermal radiation spectrum. C) With the exception of very small variations, it appears essentially the same in all directions in which we look into space. D) It is thought to be radiation that began its journey to our telescopes when the universe was about 380,000 years old.
Which expression gives the speed of light v in a substance in terms of the index of refraction n of a substance and the speed of light c in a vacuum?
a. v = c/n b. v = c n c. v = c + n d. v = n/c e. v = c/n2
If the Sun and stars are supported by gas pressure, what supports a white dwarf?
What will be an ideal response?
During an isothermal process, 5.0 J of heat is removed from an ideal gas. How much work does the gas do during this process?
A) 5.0 J B) 10 J C) -5.0 J D) 2.0 J E) 0.00 J