Which of the following is not a heat engine?

A) steam locomotive
B) hydro-electric generating plant
C) nuclear electric power plant
D) coal-fired electric generating plant
E) automobile engine

B

Physics & Space Science

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If three primary colors of light shine on a white wall and produce a white spot, the primaries must be

A) additive. B) subtractive. C) multiplicative. D) divisive.

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Physics & Space Science

There is a current I flowing in a clockwise direction in a square loop of wire that is in the plane of the paper. If the magnetic field B is toward the right, and if each side of the loop has length L, then the net magnetic torque acting on the loop is



a.
2ILB.

b.
ILB.

c.
IBL2.

d.
zero.

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Physics & Space Science

If you observe a variable star with a period of 50 days as a yellow, supergiant star, then you most likely have seen a(n) ____

a. degenerate star b. RR Lyrae variable star c. eclipsing binary star d. Cepheid variable star e. Type I Pulsar

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Physics & Space Science

Astronomers have identified more and more black holes in recent years by using x-ray imaging. If black holes are supposed to be black and not emit light, where are the x rays coming from?

a. The accretion disk is full of accelerating atoms, which emit electromagnetic radiation as they accelerate. b. The friction within the accretion disk heats the gas to very high temperatures, and the gas emits x rays according to its characteristic spectrum. c. Hawking radiation not captured by the black hole knocks out K shell electrons within the accretion disk and the matter emits characteristic x rays. d. Scientists suspect that many of the supposed black holes are indeed neutron stars that emit x-ray radiation. e. Gravitational waves coming from the black hole are thought to interact with matter in the accretion disk, exciting many of the atoms into producing x rays.

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Physics & Space Science