The efficiency of a heat engine is given by the ratio of
A. net work done/amount of heat supplied
B. net work done/amount of heat lost
C. amount of heat supplied/amount of heat lost
D. amount of heat supplied/new work done
A. net work done/amount of heat supplied
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The sedimentary rock known as ______________ consists of rounded pebbles cemented together by silica, calcium carbonate, or iron oxide
a. conglomerate b. breccia c. limestone d. shale
Two blocks, joined by a string, have masses of 6.0 and 9.0 kg. They rest on a frictionless, horizontal surface. A second string, attached only to the 6.0-kg block, has horizontal force = 45 N applied to it. Both blocks accelerate. Find the tension in the string between the blocks
a. 18 N c. 12 N b. 27 N d. 9.0 N
Under which circumstances can you be sure that the thermal pressure within a gas cloud is increasing?
A) The cloud's temperature and density are both increasing. B) The cloud's temperature is increasing and its density is decreasing. C) The cloud's temperature and density are both decreasing. D) The cloud's temperature is decreasing and its density is increasing. E) impossible to say
A spaceship is traveling to the Moon. At what point is it beyond the pull of Earth's gravity?
A) when it gets above the atmosphere B) when it is half-way there C) when it is closer to the Moon than it is to Earth D) It is never beyond the pull of Earth's gravity.