Which of the following is (are) conserved in an isolated system?
1.the kinetic energy alone
2.the potential energy alone
3.both the potential energy and the kinetic energy
4.the sum of the kinetic energy and the potential energy
4
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Interstellar dust consists mostly of
A) ozone "smog." B) microscopic particles of carbon and silicon. C) hydrogen and helium atoms. D) tiny grains of water ice. E) the same tiny particles found in household dust.
A heat pump absorbs heat from the atmosphere at a rate of 30 kW. If work is being done to run this heat pump at a rate of 7.7 kW, what is the coefficient of performance (COP) of the heat pump?
A) 22 B) 0.26 C) 2.9 D) 4.9 E) 3.9
Explain the operation of a constant-volume gas thermometer
What will be an ideal response?
The index of refraction of diamond is 2.42. This means that a given frequency of light travels
A) 2.42 times faster in air than it does in diamond. B) 2.42 times faster in diamond than it does in air. C) 2.42 times faster in vacuum than it does in diamond. D) 2.42 times faster in diamond than it does in vacuum. E) 2.42 times faster in vacuum than it does in air.