The different outcomes in touching a faulty 120-V light fixture and a high-voltage Van de Graaff generator have to do with differences in
A) sustainability of charge flow.
B) duration of charge flow.
C) amount of energy transferred.
D) all of the above
E) none of the above
Answer: D
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If the light takes 8 minutes to reach Earth from the Sun and the nearest star is 4.7 ly from the Sun, what is the distance from the Sun to the nearest star in astronomical units?
a. 37.6 AU b. 1.7 AU c. 214 AU d. 310,000 AU e. 1.5 × 10^11 AU
Rolling without slipping depends on
A) kinetic friction between the rolling object and the ground. B) static friction between the rolling object and the ground. C) normal force between the rolling object and the ground. D) tension between the rolling object and the ground. E) the force of gravity between the rolling object and the earth.
What evidence did Wegener use to support his hypothesis of continental drift?
A) sea-floor spreading B) paleoclimatic data C) polar reversals D) transform fault boundaries
Which man exerts greater pressure against the floor?
1) a 150-kg man lying on the floor 2) a 150-kg man standing on the floor 3) Both men exert the same pressure. The reason is that 4) both men have the same weight. 5) the upright man's weight is distributed over a smaller area. 6) the man lying down has his weight equally distributed.