Eleven molecules have speeds 16, 17, 18, . . . , 26 m/s. Calculate the root-mean-square of this group of molecules
A) 21.2 m/s
B) 21.0 m/s
C) 21.5 m/s
D) 21.7 m/s
Answer: A
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The period-luminosity law of pulsating variable stars indicates that
A. the period of pulsation is independent of luminosity. B. the more slowly a star pulsates, the more luminous it is. C. the faster a star pulsates, the more luminous it is. D. None of these choices is correct.
If a quantity you calculated had units of kg ? m/s, what type of quantity could it be?
A. momentum B. kinetic energy C. work D. impulse E. force
A teaspoonful of neutron star material on Earth would weigh
A) about the same as a teaspoonful of Earth-like material. B) a few tons. C) more than Mt. Everest. D) more than the Moon. E) more than Earth.
________'s theories were based on the very accurate observations made by ________
A) Kepler; Tycho Brahe B) Galileo; Kepler C) Kepler; Galileo D) Tycho Brahe; Kepler