When a fixed amount of ideal gas goes through an adiabatic expansion
A) its internal (thermal) energy does not change.
B) the gas does no work.
C) no heat enters or leaves the gas.
D) its temperature cannot change.
E) its pressure must increase.
C
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A boy throws a rock with an initial velocity of at 30.0° above the horizontal. How long does it take for the rock to reach the maximum height of its trajectory if air resistance is negligibly small and g = 9.80 m/s2?
A) 0.160 s B) 0.282 s C) 0.313 s D) 0.441 s
The position of a particle as it moves along the x axis is given by x = 15e?2t m, where t is in s. What is the acceleration of the particle at t = 1.0 s?
A. 22 m/s B. 60 m/s C. 8.1 m/s D. 15 m/s E. 35 m/s
The entropy of a certain macropartition of a combined system is 102kB. The entropy of another macropartition is 204kB. How much more likely is the system to be in the second macropartition than the first?
A. 2 times
B. e2 = 7.4 times
C. 102 = 100 times
D. e102 = 2 × 1044 times
E. 
? e0; so the two macropartitions have basically the same probability
The acceleration (or deceleration) of the expansion of the universe is determined by
a. the standard matter, baryons and leptons. b. the dark matter in the universe. c. the dark energy in the universe. d. all of the above. e. only (b) and (c) above.