The bob of a simple pendulum is a spherical hollow ball filled with water. A plugged hole near the bottom of the oscillating bob gets suddenly
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When spherical ball is half filled with water then its effective length of string increases by delta l...
L+delta l..lets its time period be t1..
T1>t2 (ball filled with water.).
Hence
Rime period first increase and then decrease to its orignal value
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