In the case of a force varying with position, what feature of the graph of force vs. position represents the work done during a displacement?
1.the maximum force times the maximum position
2.the beginning force times the total displacement
3.the area under the curve
4.nothing
3
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The direction of a magnetic field at a point can be determined by
a. a generator. b. a compass. c. a transformer. d. electromagnetic induction. e. none of the above.
200 Joules of heat flows into a 35.0 g sample. If the temperature increases by 10.0 
C then what is the specific heat capacity of the sample, in J/kg 
C?
A. 175 B. 254 C. 375 D. 422 E. 571
From 1979 to 1999 Pluto was closer to the sun than
a. Earth. b. Uranus. c. Neptune. d. Saturn. e. Jupiter
A engine manufacturer makes the claim that the engine they have developed will, on each cycle, take 100 J of heat out of boiling water at 100°C, do mechanical work of 80 J, and exhaust 20 J of heat at 10°C
What, if anything, is wrong with this claim? A) The heat exhausted must always be greater than the work done according to the second law of thermodynamics. B) This engine violates the first law of thermodynamics because 100 J + 20 J ? 80 J C) An engine would operate by taking in heat at the lower temperature and exhausting heat at the higher temperature. D) The efficiency of this engine is greater than the ideal Carnot cycle efficiency. E) There is nothing wrong with this claim because 100 J = 20 J + 80 J.