Compared to the Milky Way, how many stars are contained in the most massive galaxies?
A) two to three times as many
B) tens of times as many
C) hundreds of times as many
D) thousands of times as many
E) millions of times as many
B
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Thin Films: When a beam of light that is traveling in glass strikes an air boundary at the surface of the glass, there is
A. a 90° phase change in the reflected beam. B. no phase change in the reflected beam. C. a 180° phase change in the reflected beam. D. a 60° phase change in the reflected beam. E. a 45° phase change in the reflected beam.
The oldest rocks found on the Earth's surface date back about ________ billion years
A) one B) two C) three D) four E) four and a half
If a power plant is 30% efficient, and the transmission system that delivers power to consumers is 60% efficient, then the overall efficiency is
A) 90%. B) 60%. C) 30%. D) 18%. E) none of the above
There must be equal amounts of mass on both side of the center of mass of an object
A) True B) False