Estimation: A reasonable estimate for the mass of an ordinary passenger car is
A. 100 kg
B. 1000 kg
C. 5000 kg
D. 10,000 kg
Answer: B
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An example of conservation of angular momentum is
A. A car going around a corner B. An ice skater changing the speed of a spin C. Jumping off a diving board D. A golf club hitting a golf ball
When sign painters Burl and Paul stand on opposite ends of a scaffold, the tensions in each of the two supporting ropes
A) are equal. B) depend on the relative weights of Burl and Paul. C) combine to equal zero. D) none of the above
A bolt of lightning strikes the ground 200 m from a 100-turn coil oriented vertically and with the plane of the coil pointing toward the lightning strike. The radius of the coil is 0.800 m and the current in the lightning bolt falls from 6.02 × 106 A to zero in 10.5 ?s. What is the voltage induced in the coil over this time period? [A question for future electrical engineers: is there any way
to get lightning to strike repeatedly at the same point?]
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If the position of an electron (m = 9.11 × 10^?31 kg) could be measured to within 10?30 m, the uncertainty in the magnitude of its speed could be as much as
a. 6 × 10^?34 m/s. b. 6 × 10^25 m/s. c. 6 × 10^30 m/s. d. 1031 m/s. e. 1061 m/s.