The basic function of an electromotive force in a circuit is to do which of the following?
a. Convert electrical energy into some other form of energy.
b. Convert some other form of energy into electrical energy.
c. Both choices (a) and (b) are valid.
d. None of the above choices are valid.
b
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The maximum theoretical efficiency of a Carnot heat engine operating between reservoirs at the steam point and at room temperature is about:
A. 10% B. 20% C. 50% D. 80% E. 99%
In interactions taking place by the strong force, which of the following quantities are conserved?
a. electric charge b. baryon number c. mass-energy d. strangeness e. linear momentum f. angular momentum (spin)
A 2000 kg car is traveling at 20.0 m/s and then puts on the brakes and comes to a complete stop. The heat generated at the brakes due to stopping heats up the brakes. The mass of the brake system is 20.0 kg and it has a specific heat of 0.200 kcal/kg 
What is the increase in the temperature of the brakes?
A. 75.3
B. 53.1
C. 23.9
D. 18.9
E. 12.4
A charged particle moving with a certain velocity along the +x-axis enters a magnetic field pointing toward the +z-axis. Because of an electric field along the +y-axis the charge particle continues to move along the +x-axis
What is the sign of this particle? A) positive B) negative C) The particle could be either positive or negative. D) None of the other choices is correct.