There must be equal amounts of mass on both sides of the center of mass (or center of gravity) of a system
A) True
B) False
B
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When you lift a heavy 5.0 kg crate straight up from ground level to a height of 2.0 m above ground level, then you have changed the crate's gravitational potential energy by
A. 98 N. B. an undetermined amount, because it depends on how fast you lifted it. C. 98 m2/s2. D. 98 J. E. 98 kg m/s.
A spherical mirror has a radius of curvature of 22 cm. If the mirror is concave, its focal length is
A) -11 cm. B) -22 cm. C) 11 cm. D) -44 cm. E) 22 cm.
To calculate the masses of stars in a binary system, we must measure their
A) orbital period and average orbital distance. B) spectral types and distance from Earth. C) absolute magnitudes and luminosities. D) luminosities and distance from Earth.
Which of the following general statements about Earth's atmosphere is not true?
A) The nitrogen and oxygen in Earth's atmosphere keep the surface pleasantly warm. B) Atmospheric pressure decreases with altitude. C) Even in low-Earth orbit, some atmospheric gas is still present. D) Atmospheric scattering of light explains why our daytime sky is bright and blue.