In a spectroscopic binary, if a pair shows a combined set of lines tonight, but a maximum split two nights later, its orbital period must be
A) one day.
B) two days.
C) four days.
D) eight days.
E) twelve days.
D
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Significant Figures: The number of significant figures in 10,001 is
A. two. B. three. C. five. D. six.
When did humans learn that the Earth is not the center of the universe?
A) within the past 500 years B) about 2,500 years ago C) about 1,000 years ago D) We haven't; there is still considerable scientific debate about whether Earth is the center of the universe.
According to the law of reflection, a light ray striking a mirror at an angle of incidence of 30 degrees will leaves the mirror at an angle of
a. 60 degrees. b. 30 degrees. c. less than 30 degrees. d. none of the above.
A bicyclist starts down a hill with an initial speed of 2.0 m/s. She moves down the hill with a constant acceleration, arriving at the bottom of the hill with a speed of 8.0 m/s. If the hill is 12 m long, how long did it take the bicyclist to travel down the hill?