Consider two copper wires. One has twice the cross-sectional area of the other. How do the resistances of these two wires compare?
A)
Both wires have the same resistance.
B)
The thicker wire has half the resistance of the shorter wire.
C)
The thicker wire has twice the resistance of the shorter wire.
D)
none of the given answers
B
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A person weighs 146 pounds. The person's weight is (1 lb = 4.45 N)
A. 445 N. B. 500 N. C. 584 N. D. 650 N.
When a parachutist jumps from an airplane, he eventually reaches a constant speed, called the terminal velocity. This means that
A) the acceleration is equal to g. B) the force of air resistance is equal to zero. C) the effect of gravity has died down. D) the effect of gravity increases as he becomes closer to the ground. E) the force of air resistance is equal to the weight of the parachutist.
An ideal, reversible refrigerator keeps food in the freezer portion 
and dumps excess heat into the kitchen, whose temperature is 
What is the refrigerator’s coefficient of performance under these conditions?
A. 7.4 B. 4.0 C. 8.4 D. 2.1
Each pattern shown below would appear on a screen when monochromatic light first passes through a narrow slit of width a and then strikes a screen. The darkest areas on the page represent the brightest areas on the screen. In which case is the slit illuminated with light of the shortest wavelength?
a.
b.
c.
