When you touch a warm pot on the stove,
A) work flows from your hand to the pot.
B) work flows from the pot to your hand.
C) thermal energy flows from your hand to the pot.
D) thermal energy flows from the pot to your hand.
E) electric energy flows from the pot to your hand.
D
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If the efficiency of a Carnot engine were to be 100%, the heat sink would have to be
A) infinitely hot. B) at 0°C. C) at absolute zero. D) at 100°C.
Which types of galaxies lack an ordered structure of stellar orbits?
a. elliptical galaxies only b. spiral galaxies only c. irregular galaxies only d. elliptical and irregular galaxies e. spiral and irregular galaxies
As a particle's uncertainty in position gets smaller, its uncertainty in velocity
A) must remain unchanged. B) must decrease enough to satisfy the uncertainty principle. C) must increase enough to satisfy the uncertainty principle.
A super train is moving along a track at a speed close to the speed of light. You are watching the train from the ground. You observe lightning to strike in two places along the track, a mile apart, at precisely the same time. What would someone on the train say?
A) The two bolts of lightning struck at different times, and they struck at places that are less than a mile apart. B) The two bolts of lightning struck at different times, and they struck at places that are more than a mile apart. C) The two bolts of lightning struck at the same time, and they struck at places that are less than a mile apart. D) The two bolts of lightning struck at different times, and they struck at places that are precisely a mile apart.