An auto travels down a straight, level road at constant speed. One force that acts on the auto is
A) the road pushing upward on the auto.
B) the auto pushing downward on the road.
C) gravity pushing upward on the auto.
D) the road pulling downward on the auto.
E) None of the above.
A
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a. 200,000 m b. 20,000 m c. 2,000 m d. 200 m e. 0.02 m
Phase Angles: A 20.0-mH inductor is connected in series with a 100-? resistor at 1.00 kHz in an ac circuit. What is the phase angle of this circuit?
A. 90.0° B. 51.5° C. 38.5° D. 0° E. 45°
A starship navigator measures the distance between the Earth and the sun. If the ship is moving at a speed of 0.90 c, instead of obtaining 93 million miles, the navigator measures a distance (in millions of miles) of
a. 41. b. 30. c. 80. d. 215. e. 90.
The total momentum of a flock of identical birds could be zero only if the birds are
A) taking off from the ground. B) flying in the same direction. C) flying in different directions. D) very tired and coming down to rest.