A heat engine absorbs 85.6 kJ of heat each cycle and exhausts 61.8 kJ
(a) What is the efficiency of the engine?
(b) How much work does it do each cycle?
What will be an ideal response?
(a) 27.8% (b) 23.8 kJ
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When the Moon is on the horizon, it appears larger than when it is high in the sky. Why?
A. Its angular size is larger on the horizon. B. This is an optical illusion. C. When it is on the horizon, it is closer to us. D. The brightness of the Moon makes it seem larger. E. Earth's atmosphere acts like a lens, magnifying it.
Of the Jovian satellites, which shows the oldest, most cratered surface?
A) Miranda B) Callisto C) Enceladus D) Ganymede E) Triton
Which of the following is not a planar defect?
(a) Edge dislocation (b) Stacking fault (c) Twin (d) Grain boundary
A person weighting 700 N stands in the middle of an otherwise empty 4 m x 5 m x 3 m room. How does the weight of the person compare with the weight of the air (the density of air is 1.29 kg/m3 ) in the room?
A) The weight of the air is much more than the weight of the person. B) The weight of the air is about the same as the weight of the person. C) The weight of the air is much less than the weight of the person. D) It makes no sense to speak of weight for a gas like air.