A football thrown with a spinning motion is more stable than one thrown without spin because
A. the angular momentum of a spinning object can only be changed by applying a torque.
B. the torque generated by the spinning action is conserved.
C. air flows more easily around spinning objects.
D. there is no net torque on a spinning object.
Answer: A
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A ceiling fan is turned on and reaches an angular speed of 120 rev/min in 20 s. It is then turned off and coasts to a stop in an additional 60 s. The ratio of the average angular acceleration for the first 20 s to that for the last 60 s is which of the following?
a. 3 c. 0.3 b. –3 d. –0.3
A circuit consists of N resistors, all of resistance R, connected as shown below. A potential difference V is applied to the circuit. The equivalent resistance of the circuit is
a.
.
b.
R.
c.
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