First Law of Thermodynamics: An external heat source supplies heat to a system at a rate of 187 W as the system does work at a rate of 131 W. At what rate is the internal (thermal) energy of the system changing?
A. -56 W
B. 320 W
C. 56 W
D. 190 W
E. -320 W
Answer: C
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A good heat conductor is a
A) poor insulator. B) good insulator. C) neither of these
Melting and freezing are
A) changes of phase. B) opposite processes. C) both of these D) neither of these
A hydraulic lift raises a 2000-kg automobile when a 500-N force is applied to the smaller piston. If the smaller piston has an area of 10 cm2, what is the cross-sectional area of the larger piston?
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