A 500-N weight sits on the small piston of a hydraulic machine. The small piston has an area of 2.0 cm2. If the large piston has an area of 40 cm2, how much weight can the large piston support? Assume the pistons each have negligible weight
A) 25 N
B) 500 N
C) 10000 N
D) 40000 N
C
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What happens to the surface temperature and luminosity when a protostar radiatively contracts?
A) Its surface temperature and luminosity increase. B) Its surface temperature remains the same and its luminosity decreases. C) Its surface temperature and luminosity decrease. D) Its surface temperature decreases and its luminosity increases. E) Its surface temperature and luminosity remain the same.
An adiabatic free expansion of a gas in a thermally isolated container is not reversible because
A. work must be done on the gas to return it to its original volume. B. heat must be exchanged with the surroundings to return the gas to its original temperature. C. its internal energy has a greater value after the expanded gas is returned to its original volume and temperature. D. of all of the above. E. of (a) and (b) above only.
The base SI unit of length is
A) millimeter. B) centimeter. C) meter. D) kilometer. E) megameter.
A wave on a string has a wavelength of 0.90 m at a frequency of 600 Hz. If a new wave at a frequency of 300 Hz is established in this same string under the same tension, what is the new wavelength?
a. 2.7 m c. 0.45 m b. 1.8 m d. 0.30 m