A pendulum of length L is suspended from the ceiling of an elevator. When the elevator is at rest the period of the pendulum is T. How does the period of the pendulum change when the elevator moves upward with constant acceleration?
A) The period does not change.
B) The period decreases.
C) The period increases.
D) The period increases if the upward acceleration is more than g/2 but decreases if the upward acceleration is less than g/2.
E) The period becomes zero.
B
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A piston in an internal combustion engine applies torque during 
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