Determine the average kinetic energy per atom due to thermal vibrations in a solid at 1000 K. You can assume that the heat capacity at constant volume for the solid is equal to the classical limit of 3R for all temperatures, and that the material is at constant volume during heating. Express your answer in eV/atom.
What will be an ideal response?
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When the nuclear reactions begin making too little energy in a star, by virtue of the natural thermostat, the star:
A) would expand slightly. B) would reduce its central temperature. C) would increase its density. D) would increase the mass by a factor of 2.
In the fissioning of uranium, a chain reaction is caused by
A) the kinetic energy of the decay products. B) ejected neutrons. C) alpha particles. D) none of the above
A woman who weighs 500 N stands on a 6.0-m-long board that weighs 100 N. The board is supported at each end. The support force at the right end is 3 times the support force at the left end. How far from the right end is the woman standing?
a. 4.8 m b. 2.1 m c. 1.7 m d. 1.2 m e. 3.9 m
A 3.0-cm tall statue is 48 cm in front of a convex lens having a focal length of magnitude 20 cm
(a) Is the image of the statue real or virtual? (b) How far is the image from the lens? (c) Is the image upright or inverted? (d) How tall is the image?