A Carnot engine operates between two reservoirs with unknown temperatures. If the Carnot engine operates at efficiency, what is the ratio of the absolute temperatures of the reservoirs, Tc/Th?
A) 0.33
B) 0.0012
C) 0.0025
D) 0.67
A
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Photon A has a higher energy than photon B. Given this information, which of the following statements is true?
A) Photon A has a longer wavelength than photon B B) Photon A travels faster in a vacuum than photon B C) Photon A has a higher frequency than photon B D) Photon A has a lower frequency than photon B
How much heat (in kilocalories) is needed to convert 1.00 kg of ice at 0°C into steam at 100°C?
a. 23.9 b. 79.6 c. 564 d. 643 e. 720
_________hardening is the least expensive process for strengthening metals, because no expensive alloy elements are added, and it is only necessary to deform the metal with standard deformation processes.
Fill in the blank(s) with the appropriate word(s).
What is the amplitude (in meters) of a wave whose displacement is given by y = 50. sin(0.20x + 120t) cm?
A) 0.50 m B) 1.0 m C) 6 m D) 0.20 m E) 10 m