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A final exam for physics 124 from 2009, including multiple-choice questions on various topics such as mechanics, thermodynamics, and waves. Useful physical constants and formulae are provided.
Typology: Exams
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Useful physical constants: Gas constant R = 8.314 J/mol K. Boltzmann con- stant kB = 1.38× 10 −^23 J/K. Avogadro’s number NA = R/kB = 6.02× 1023. 0 ◦C = 273 K. Speed of sound in air = 343 m/s. Atmospheric pressure = 10^5 Pa. Gravitational constant G = 6.67× 10 −^11 m^3 /s^2 kg. At earth’s surface g = 9.8 m/s^2. Stefan-Boltzmann constant σ = 5.67× 10 −^8 W/m^2 K^4. Volume of a sphere = 4πr^3 /3.
a) L/ 2 b) 3 L/ 4 c) L d) 5 L/ 4 e) 3 L/ 2
a) 3.1 m/s b) 6.3 m/s c) 12 m/s d) 25 m/s e) 37 m/s
2 PHe c) PH = PHe d) PH = 2PHe/
e) PH = PHe/ 2
a) During an isothermal process, the entropy of the gas does not change. b) During an adiabatic process, the temperature of the gas does not change. c) During an isobaric process, no work is done on or by the gas. d) During an isothermal process, no heat enters or leaves the gas. e) During an isochoric process, the change in the internal energy of the gas is exactly equal to the amount of heat that goes into (or out of) the gas.
a) The difference in entropy between two states of a system is indepen- dent of the path between the two states. b) Entropy can be measured in units of J/K. c) The total entropy change in one cycle of a Carnot engine is zero. d) The entropy of an isolated system is conserved, i.e., constant. e) Entropy is a quantitative measure of disorder.
a) They do not expand/contract. b) There is no pressure inside them. c) Their work is small. d) They don’t do work. e) There is no pressure difference at the surface.