An ideal gas is allowed to undergo a free expansion. If its initial volume is V1 and its final volume is V2, the change in entropy is
a. nR ln (V2/V1)
b. nRT ln (V2/V1)
c. nk ln (V2/V1)
d. 0
e. nR V2/V1
a
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How do we know the Sun is in hydrostatic equilibrium?
A. It is not growing colder. B. It is not exploding. C. It is not collapsing. D. All of these choices are correct. E. None of these choices are correct.
Two stars have the same luminosity. Star X is spectral type F, while Star Y is spectral type K. Therefore, Star X is larger in radius than Star Y
Indicate whether the statement is true or false
A 5.0-m radius playground merry-go-round with a moment of inertia of 2000 kg?m2 is rotating freely with an angular speed of 1.0 rad/s
Two people, each having a mass of 60 kg are standing right outside the edge of the merry-go-round and step on it with negligible speed. What is the angular speed of the merry-go-round right after the two people have stepped on? A) 0.20 rad/s B) 0.40 rad/s C) 0.60 rad/s D) 0.80 rad/s E) 0.67 rad/s