The radial velocity curve of a star with an extrasolar planet is a plot of
A) radial velocity against luminosity
B) radial velocity against brightness
C) radial velocity against distance
D) radial velocity against time
D
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In what form does water exist on the Moon?
A) There is water ice in craters near the poles. B) There are small pools of liquid water just beneath the surface. C) There are shallow lakes of liquid water in the deepest craters. D) There is water ice in the bright regions of the lunar maria. E) There is no water in any form on the Moon. Answer: A
The surface of Earth is an example of a free-float reference frame
Indicate whether the statement is true or false
The percentage of 235U, as a fraction of the total uranium content, in a uranium fission bomb is closest to
A) 50 percent. B) 20 percent. C) 1 percent. D) 90 percent. E) 5 percent.
Mass and weight on Earth's surface
a. are the same thing. b. are defined solely by inertia. c. are explained by Newton's third law. d. differ in magnitude by a constant. e. are explained by Kepler's second law.