According to the second law of thermodynamics, which of the following applies to the heat received from a high temperature reservoir by a heat engine operating in a complete cycle?
a. must be completely converted to work
b. equals the entropy increase
c. converted completely into internal energy
d. cannot be completely converted to work
D
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A light beam from a 2.1-mW He-Ne laser has a wavelength of 633 nm. How many photons does the laser emit in one second? (h = 6.626 × 10-34 J ? s, c = 3.00 × 108 m/s)
A) 6.7 × 1015 B) 8.8 × 1015 C) 1.1 × 1016 D) 1.3 × 1016
A dart is loaded into a spring-loaded toy dart gun by pushing the spring in by a distance d. For the next loading, the spring is compressed a distance d/2. How much faster does the second dart leave the gun compared with the first?
1.two times as fast 2.the same 3.half as fast 4.one fourth as fast
The rate of flow of electric charge is
a. voltage b. current c. resistance d. electric field e. critical temperature
Which of the following is the strongest evidence in support of the hypothesis that the Solar System was formed by the collapse of a gas and dust nebula?
A. the discovery of extra solar planets B. images of other stars with gas and dust disks surrounding them C. the existence of large clouds D. radiometric dating of dust from the Moon's surface