The efficiency of a Carnot engine would be increased if
A. the high and low temperatures were both lowered by 100°C.
B. the high and low temperatures were both raised by 100°C.
C. the low temperature were raised by 100°C.
D. the high temperature were lowered by 100°C.
Answer: A
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A soda-pop can containing only steam is placed top downward in a pan of water. Whap! The can is dramatically crushed by atmospheric pressure. The reduced pressure inside the can is due to
A) contact with the relatively cooler water. B) sudden slowing of the air and steam molecules inside. C) condensation of steam inside. D) reduced internal energy. E) rapid conduction of heat to the relatively cool water.
A 400-kg box is lifted vertically upward with constant velocity by means of two cables pulling at 40.0° on either side of the vertical direction. What is the tension in each cable?
A) 231 N B) 400 N C) 800 N D) 2560 N E) 3920 N
During the double-slit experiment with light, the region between the slits and the screen contains
A) an electromagnetic field. B) electrons. C) photons. D) a matter field. E) None of the above.
A small source radiates an electromagnetic wave with a single frequency into vacuum, equally in all directions. As the wave moves, its speed:
1.increases. 2.decreases. 3.stays constant.