What is the Carnot cycle efficiency for a system that operates with low temperature reservoir at 20°C and a high temperature reservoir at 200°C?
A)
0.620
B)
0.380
C)
0.288
D)
0.411
E)
0.900
B
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If you move an electron in an atom from a low energy level to a higher energy level within the atom, we say that the atom is
a. in the ground state. b. ionized. c. dissociated. d. in an excited state. e. neutralized.
Why is a 1-solar-mass red giant more luminous than a 1-solar-mass main-sequence star?
A) Fusion reactions are producing energy at a greater rate in the red giant. B) The red giant has a hotter core. C) The red giant's surface is hotter. D) The red giant is more massive.
The rate of cratering in the lunar highlands shows us that:
A) they must be younger than the older, darker mare. B) they range from 4.6-4.4 billion years old, on average. C) the largest impacts are the youngest, such as Copernicus and Tycho. D) the oldest rocks are at least as old as the mare, but some craters are much younger. E) most of the asteroids must have hit the Moon, not the Earth.
Magnetic Field of a Long Wire: A horizontal wire carries a current straight toward you. From your point of view, the magnetic field caused by this current
A. points directly away from you. B. points to the left. C. circles the wire in a clockwise direction. D. circles the wire in a counter-clockwise direction.