On a cold day your feet feel warmer on a rug than on a tile floor because a rug
A) is usually warmer than tile.
B) is a poorer conductor.
C) for the same mass has more internal energy than tile.
D) all of the above
E) none of the above
Answer: B
Physics & Space Science
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A hollow conducting sphere of radius 12 cm had a charge of 18 
C placed on it. What is the potential 20 cm from the center of the sphere?
A. 0 V
B. 15 V
C. 73 V
D. 
E. 
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A heat pump has a coefficient of performance of 4. If the heat pump absorbs 20 cal of heat from the cold outdoors in each cycle, the heat expelled (in cal) to the warm indoors is
A. 34 B. 25 C. 36 D. 40 E. 80
Physics & Space Science
When a system is being driven at a natural frequency, it is said to be driven in ______________
Fill in the blank(s) with correct word
Physics & Space Science
The Pliocene is a(n)
a. epoch. b. era. c. eon. d. period.
Physics & Space Science