The textbook shows a graph of the history of U.S. energy use since 1950. According to this graph, which of the following resources presently delivers the most energy [or energy equivalent] annually to the United States?
A) coal
B) renewable forms such as hydroelectric and solar
C) conservation, considered as equivalent to an energy resource
D) oil
E) nuclear
C
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Buoyancy: A cylinder, semicircular in cross-section, is 10 m long and 5.0 m in radius. It is completely submerged, with its flat bottom side horizontal and 8.0 m below the water surface, as shown in the figure. What is the magnitude of the net force on the curved upper surface of the half-cylinder? Neglect atmospheric pressure.
A. 2.0 × 106 N B. 2.5 × 106 N C. 3.0 × 106 N D. 3.5 × 106 N E. 4.0 × 106 N
Why do jovian planets bulge around the equator, that is, have a "squashed" appearance?
A) They are much more massive than the terrestrial planets. B) Their large systems of moons and rings gravitationally attract the mass around the equator more. C) Their rapid rotation flings the mass near the equator outward. D) Their internal heat sources exert a pressure against the sides of the planets. E) all of the above
The metric system is preferred over the British system in science for the following main reason
A) The metric system is more precise than the British system. B) Metric quantities can be defined more accurately than the quantities in the British system. C) Metric quantities are natural whereas British quantities are invented. D) Conversions between metric quantities are especially easy because they are all related by factors of ten.
When an oscillator is driven in resonance,
a. there are no standing waves. b. any driving frequency may be used. c. all natural frequencies are present. d. there is maximum energy transfer.