The string of a pendulum of length l is displaced through 90o from the vertical and released. Then the minimum strength of the string in order to withstand the tension as the pendulum passes through the mean position is
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a
3 mg
b
4 mg
c
5 mg
d
6 mg
answer is A.
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Detailed Solution
The velocity at the lowest point is given by v=(2gr)Further, T−mg=mv2r∴ T=mg+mv2r=mg+m(2gr)r=mg+2mg=3mg
The string of a pendulum of length l is displaced through 90o from the vertical and released. Then the minimum strength of the string in order to withstand the tension as the pendulum passes through the mean position is