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Q.

There is a simple pendulum hanging from the ceiling of a lift. When the lift is stand still, the time period of the pendulum is T. If the resultant acceleration becomes g/4 then the new time period of the pendulum is

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a

0.8 T

b

0.25 T

c

2 T

d

4 T

answer is C.

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Detailed Solution

When lift is at rest, T=2πl/gIf acceleration becomes g/4 then T'=2πlg/4=2π4lg=2×T

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