During each cycle of operation, a refrigerator absorbs 230 J of heat from the freezer and expels 356 J of heat to the room. How much work input is required in each cycle?
A) 712 J
B) 586 J
C) 460 J
D) 126 J
D
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The light-gathering power of a telescope is directly proportional to the:
A) square of the diameter of the primary mirror or lens. B) cube of the diameter of the primary mirror or lens. C) square of the focal length of the primary mirror or lens. D) cube of the radius of curvature of the primary mirror or lens.
Consider the equipotential diagram shown below and to the left: 
In what direction does the electric field at point P point?
A. A B. B C. C D. D
Phil leans over the edge of a cliff and throws a rock upward at 5 m/s. Neglecting air resistance, one second later the rock's speed is
A) zero. B) 5 m/s. C) 10 m/s. D) 15 m/s. E) none of the above
A magnetic field will be produced at a point in space if an electric field at that point
a. exists b. gets stronger c. gets weaker d. changes direction e. all of the above