Q.

A pendulum suspended from the ceiling of a train has a period T, when the train is at rest. When the train is accelerating with a uniform acceleration a, the period of oscillation will

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a

Increase

b

Decrease

c

Remain unaffected

d

Become infinite

answer is B.

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Detailed Solution

Initially time period was T=2πlg.When train accelerates, the effective value of g becomes (g2+a2)  which is greater than gHence, new time period, becomes less than the initial time period.
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A pendulum suspended from the ceiling of a train has a period T, when the train is at rest. When the train is accelerating with a uniform acceleration a, the period of oscillation will