We know that giant stars are larger in diameter than the Sun because
a. they are more luminous but have about the same temperature.
b. they are less luminous but have about the same temperature.
c. they are hotter but have about the same luminosity.
d. they are cooler but have about the same luminosity.
e. they have a larger absolute magnitude than the Sun.
a
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First Law of Thermodynamics: A cyclic process is carried out on an ideal gas such that it returns to its initial state at the end of a cycle, as shown in the pV diagram in the figure. If the process is carried out in a counter-clockwise sense around the enclosed area, as shown on the figure, then the magnitude of the enclosed area represents 
A. the heat that flows out of the gas. B. the work done on the gas. C. the heat added to the gas. D. the work done by the gas.
Resolution: If the diameter of a radar dish is doubled, what happens to its resolving power assuming that all other factors remain unchanged?
A. The resolving power quadruples. B. The resolving power doubles. C. The resolving power is cut in half. D. The resolving power is reduced to one-quarter its original value.
The Roche limit is the point at which:
A) the mass of an object classifies it as a moon. B) a moon orbiting a planet experiences synchronous rotation. C) the external tidal forces on an object are strong enough to be felt by the object. D) the external tidal forces on an object become greater than the internal forces that hold it together. E) the internal forces that hold an object together weaken so that the object falls apart.
In a physical fitness program, a woman who weighs 510 N runs up four flights of stairs in 22 s. Each flight rises 3.1 m
(1 hp = 746 W) (a) What is her total change in potential energy? (b) What was the minimum average power (in watts) that she expended during the 22 s? (c) What horsepower motor would be required to generate the same power?