When an ideal gas adiabatically expands
A. the temperature of the gas changes.
B. the internal energy of the gas does not change.
C. work is not done on or by the gas.
D. no heat is given off or taken in by the gas.
D. no heat is given off or taken in by the gas.
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Specific Heat: A 4.0-kg aluminum block is originally at 10°C. If 160 kJ of heat is added to the block, what is its final temperature? The specific heat capacity of aluminum is 910 J/kg ? K.
A. 24°C B. 34°C C. 44°C D. 54°C
You want to swim straight across a river that is wide. You find that you can do this if you swim at an angle of ? = 28° from the upstream direction at a constant rate of relative to the water
At what rate does the river flow? The angle ? is measured from the river bank (directly upstream is while directly across the river is A) 1.3 m/s B) 0.70 m/s C) 1.6 m/s D) 1.8 m/s
Which two processes can generate energy to help a star or gas cloud maintain its internal thermal pressure?
A) nuclear fusion and nuclear fission B) nuclear fusion and supernovae C) nuclear fission and supernovae D) nuclear fusion and gravitational contraction
In a police rifle test, a 15-g bullet traveling 213 m/s in a vertical direction suddenly buries itself in a 2.4-kg block of wood at rest directly above it. As a result, the bullet-block combination moves vertically upward
(a) Determine the velocity of the bullet-block combination just after the impact. (b) Determine the maximum height reached by the bullet/block combination. (c) Is kinetic energy conserved in this collision?