RMS and Peak Quantities: What is the peak voltage in an ac circuit where the rms voltage is 120 V?
A. 84.8 V
B. 120 V
C. 170 V
D. 240 V
Answer: C
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Pressure: When a heavy metal block is supported by a cylindrical vertical post of radius R, it exerts a force F on the post. If the diameter of the post is increased to 2R, what force does the block now exert on the post?
A. F/4
B. F/2
C. F/
D. F
E. 2F
The escape velocity inside a black hole is
A. half the speed of light. B. infinity. C. greater than the speed of light. D. zero. E. unknown.
Exhibit 12-2
The figure below shows a graph of angular velocity versus time for a man bicycling around a circular track.
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Use this exhibit to answer the following question(s).
Refer to Exhibit 12-2. What is his average angular acceleration, in rad/s2, in the period from t = 6 min to t = 8 min?
A.
B.
C.
D.
E.
Refer to diagram of billiard balls F, K, M, and T. Each arrow represents the velocity of the ball. If billiard ball M is traveling straight upward at 2.5 m/sec, then
A. billiard ball F is the slowest of the four. B. billiard ball K has the same velocity as M. C. nothing about their speeds can be said, because they are all moving in different directions. D. billiard ball M must be faster than T.