Study the sizes of the gas giants shown in the image above (the distance from the Sun increases from left to right), and choose the best explanation that accounts for their differences in size.
Choose one:
A. Gas giants increase in size with increased distance from the Sun because more types of materials could condense farther out.
B. Gas giants increase in size with increased distance from the Sun because the Solar Nebula was denser farther out.
C. Gas giants decrease in size with increased distance from the Sun because the Solar Nebula was less dense farther out.
D. Gas giants decrease in size with increased distance from the Sun because fewer types of materials could condense farther out.
C. Gas giants decrease in size with increased distance from the Sun because the Solar Nebula was less dense farther out.
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A 1200 kg car travels at 25.0 m/s and collides head-on in a perfectly inelastic collision with a stationary 2400 kg truck. The kinetic energy lost in the collision is
A. 330,000 J. B. 250,000 J. C. 125,000 J. D. 95,000 J. E. 75,000 J.
Why does the Cepheid "standard candle" have limited usefulness beyond 20 Mpc?
A) Distant galaxies are seen in the past, when Cepheid variables behaved differently than they do today. B) Distant galaxies are so young they do not contain Cepheids. C) Cepheids are too faint to be seen beyond that distance, even with HST. D) The light variability of Cepheids diminishes with distance so they do not appear to vary there. E) Older distant Cepheids are of Population II, where the period-luminosity relation no longer works.
What is Boyle's law?
a. Gas temperature is a constant. b. Gas pressure is a constant. c. The product of gas volume and gas pressure is a constant. d. The product of gas temperature and gas pressure is a constant. e. The sum of gas temperature and gas pressure is a constant.
In the apparatus shown here, when the switch is open there is not attractive force between the wires. When the switch is closed, the currents are in the same direction and the wires are attracted to each other. If the currents in the two parallel wires were to point in opposite directions, what would be the force between the wires?
a. Attractive. b. Repulsive. c. Zero. d. One is pushed up and the other pushed down. e. Each one pushes the other up.