Which of the following is an almost reversible process?
A. The explosion of hydrogen and oxygen to form water.
B. Heat transfer through thick insulation.
C. The adiabatic free expansion of a gas.
D. A slow isothermal compression of a gas.
E. A slow leakage of gas into an empty chamber through a small hole in a membrane.
Answer: D
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The wavelengths corresponding to the harmonics of a string with fixed ends can be found by saying that the length of the string must be equal to
A) an odd number of quarter-wavelengths. B) an odd number of third-wavelengths. C) an odd number of half-wavelengths. D) an integer number of half-wavelengths. E) an integer number of wavelengths.
The kilowatt-hour is a unit of
a. power c. voltage b. energy d. current
Where would you least expect to find an ionization nebula?
A) in the galactic disk B) near a hot, young star C) in a spiral arm D) in the halo of our galaxy
When a drawn bow of potential energy 40 J is fired, the arrow will ideally have a kinetic energy
A) less than 40 J. B) more than 40 J. C) of 40 J.