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Q.

A simple pendulum hung from the ceiling of a train moving at constant speed has a period T. If the train starts accelerating or decelerating, then what will be the effect on time period of pendulum?

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a

Decreases only when train accelerates

b

Decreases only when train decelerates

c

Decreases in both cases

d

Increases in both cases

answer is .

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Detailed Solution

T = 2πl|g→+a→|  .   a→ is in horizontal direction in both cases. Hence |g→+a→| > g, so T decreases in both cases.
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