Power: A force produces power P by doing work W in a time T. What power will be produced by a force that does six times as much work in half as much time?
A. 12P
B. 6P
C. P
D. 
P
E. 
P
Answer: A
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If a Carnot heat engine is run in reverse, it becomes
A. a heat engine with the smallest possible efficiency. B. a refrigerator. C. an engine that has a negative efficiency. D. nothing. It can't be run in reverse because to do so would violate the second law of thermodynamics.
The voltage for typical home appliances is ______________
Fill in the blank(s) with correct word
A circular disk is rotating about a central axis with an angular velocity which is increasing at a constant rate. Point 1 on the disk is located at a distance r1 from the center of the disk and point 2 on the disk is located at a distance r2 from the center of the disk. If r2 = 2r1, which of the following ratios is the largest? 1 and 2 refer to being at points 1 and 2 in the subscripts below, all
values occurring at the same time. a. ?2/?1 b. ?2/?1 c. ac2/ac1 d. All the ratios are 1 so none is larger.
The sound of a bird singing is given as 5 dB. What is the intensity of the sound of a bird singing?
a. 
b. 
c. 
d. 
e. 