When an object is dropped from a tower, what is the effect of the air resistance as it falls?
a. It does positive work.
c. It increases the object's potential energy.
b. It increases the object's kinetic energy.
d. None of the above choices are valid.
D
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Which of these are effects of the Doppler shift?
A. When an object accelerates, the wavelengths of its light get warmer. B. When an object is moving toward us, the wavelengths of its light decrease. C. When an object slows, the wavelengths of its light get cooler. D. When an object is moving away from us, the frequencies of its light increases.
In a game of shuffleboard (played on a horizontal surface), a puck is given an initial speed of 6.0 m/s. It slides a distance of 9.0 m before coming to rest. What is the coefficient of kinetic friction between the puck and the surface?
a. 0.20 b. 0.18 c. 0.15 d. 0.13 e. 0.27
Magnifying Glass With the Image at the Near Point of the Eye: Vicki very closely examines her new ruby ring with the jeweler's "loop." The ruby appears 7.0 times larger through this lens than when she views it close-up without the "loop." If her near point is 35 cm, what is the focal length of the lens of the "loop"?
A. 4.2 cm B. 6.7 cm C. 7.0 cm D. 3.6 cm E. 5.8 cm
The graph below indicates the temperature of Saturn's atmosphere as a function of distance from the upper cloud layer. Water will condense to form droplets at a temperature of approximately 270 K in the atmosphere of Saturn. At what distance from the upper cloud layer will clouds of water vapor form?
a.
-250 km
b.
-150 km
c.
0 km
d.
150 km
e.
250 km