A container holds oxygen and helium gases at the same temperature. Which one of the following statements is correct?
A. the oxygen molecules have the greater kinetic energy
B. the helium molecules have the greater kinetic energy
C. the oxygen molecules have the greater speed
D. the helium molecules have the greater speed
D. the helium molecules have the greater speed
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This photo shows the visible light spectrum of the Sun. Why does it have all those dark lines on it?
A) The dark lines represent wavelengths of light at which atoms near the Sun's surface absorb radiation from the hotter solar interior. B) The dark lines come from sunspots on the Sun, which are dark in color. C) The dark lines are caused by Doppler shifts. D) The dark lines are not real, but rather are artifacts of the photographic process used to record the spectrum.
A baseball weighs 1.5 N on Earth. Another type of ball weighs 1.5 N on the Moon. The ball with the greater mass is the
A) baseball. B) other type of ball. C) same for each. D) not enough information
Which of the following phenomena are not thought to be results of collisions or other interactions between galaxies?
A) the fact that spiral galaxies have both disk and halo components B) the fact that elliptical galaxies are more common in clusters of galaxies than outside clusters C) starbursts D) the presence of very large, central dominant galaxies in clusters of galaxies
A 7.5 kg bowling ball is dropped from the top of a 25m tall building. Ignoring air resistance, when the bowling ball hits the sidewalk below, its kinetic energy is equivalent to how many food calories (one food calorie = 1 kilocalorie in SI measure)
A. 0.44 B. 880 C. 440 D. 0.22 E. 0.88 F. 220