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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The work done by the centripetal force on an object with a mass of 1 kg moving with a constant velocity of 4 m/s into a circular path of radius 0.6 m for one full cycle is
A) 100.7 J B) 3.8 J C) 0 J D) 40 J E) 80 J
Which tin can will roll down an incline in the shortest time, one filled with water or one filled with ice? (Hint: water 'slides' inside the can.)
A) with water B) with ice C) both the same D) need more information
If the ground state configuration of an atom is 
what is the atomic number of the atom?
A. 14 B. 10 C. 8 D. 4 E. 3
A sealed hot air balloon is capable of rising to high altitudes when it is initially released. As the air in the balloon cools, however, it eventually comes back down to the ground because
A. objects can only float in a fluid if their density is less than that of the fluid. B. what goes up must come down. C. objects heavier than air can only fly through the air with the help of a motor. D. the object comes down when the air in it eventually leaks out.