A heat pump uses 100 J of work output heat at some temperature. If the heat pump withdraws 60 J of heat from some lower temperature, then what is the coefficient of performance for the heat pump?
A. 1.6
B. 2.0
C. 2.4
D. 2.8
A. 1.6
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The path difference between two waves is 5 m. If the wavelength of the waves emitted by the two sources is 4 m, what is the phase difference (in degrees)?
A. 90 B. 400 C. 1.57 D. 7.85 E. 15
At some point between Earth and the Moon, the forces due to gravity on a space traveler would be the same when this point is
A) nearer Earth. B) nearer the Moon. C) mid-way between Earth and the Moon. D) none of the above
If one waits for a time equal to two half-lives for a certain radioactive material, all of it originally present will have decayed completely
a. True b. False Indicate whether the statement is true or false
A mass is attached to a vertical spring and bobs up and down between points A and B. Where is the mass located when its kinetic energy is a maximum?
A) at either A or B B) midway between A and B C) one-third of the way between A and B D) one-fourth of the way between A and B E) none of the above