The kilowatt-hour is a unit of
a. power. b. energy.
c. voltage. d. current.
b
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When an ideal gas adiabatically expands
A. the temperature of the gas changes. B. the internal energy of the gas does not change. C. work is not done on or by the gas. D. no heat is given off or taken in by the gas.
An astronaut falling into a black hole would see the universe
A) red-shifted. B) blue-shifted. C) with no shift at all.
When light goes from one material into another material having a HIGHER index of refraction
A) its speed, wavelength, and frequency all decrease. B) its speed and wavelength decrease, but its frequency stays the same. C) its speed decreases but its wavelength and frequency both increase. D) its speed decreases but its frequency and wavelength stay the same. E) its speed increases, its wavelength decreases, and its frequency stays the same.
A mass is suspended from a string in an airplane. As the plane is in the process of taking off, it is found that the string, instead of being vertical, hangs at an angle of 13° from the vertical. What is the acceleration of the plane at this time?
a. 2.3 m/s2 c. 9.1 m/s2 b. 3.8 m/s2 d. 3.5 m/s2