The similarity of the Sun's and the Moon's angular sizes allows ________ to occur.
A. seasons
B. sunspots
C. eclipses
D. lunar phases
E. tides
Answer: C
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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?
Spherical Mirrors: Tan's face is 20 cm in front of a concave shaving mirror. If he observes his image to be twice as big and upright, what is the focal length of the mirror?
A. 10 cm B. -40 cm C. -50 cm D. 40 cm E. 50 cm
Which of the following is a property of Seyfert galaxies?
A. Their nuclei have abnormally low luminosities. B. The radiation from their cores fluctuates rapidly. C. Most are elliptical galaxies. D. They contain no gas clouds.
On a cold day, a heat pump absorbs heat from the outside air at 14°F (?10°C) and transfers it into a home at a temperature of 86°F (30°C). Determine the maximum COP of the heat pump.
A. 0.2 B. 4.4 C. 0.5 D. 7.6 E. 6.7