The air in your room is composed of molecules that have
A) nearly identical speeds.
B) a wide variety of speeds.
C) no speeds worth mentioning.
Answer: B
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A ball drops some distance and gains 30 J of kinetic energy. Do not ignore air resistance. How much gravitational potential energy did the ball lose?
A) more than 30 J B) exactly 30 J C) less than 30 J D) Cannot be determined from the information given.
Almost all properties of other stars are described relative to our Sun
Indicate whether the statement is true or false
Underground rivers can exist in
A) limestone aquifers. B) science fiction. C) all aquifers. D) any of the above.
The wind speed of the air flowing over a 16-cm-diameter outside mirror is significantly higher than the speed of a vehicle. If the pressure on the front of the mirror is assumed to be stagnation pressure and the pressure on the rear is assumed to be atmospheric, the power needed to move the mirror, if the air velocity around the mirror is 30 m/s, is nearest:
(A) 0.44 hp (B) 0.39 hp (C) 0.34 hp (D) 0.29 hp