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

Physics & Space Science

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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

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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

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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

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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

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