SHMHard

Question

The length of a simple pendulum executing simple harmonic motion is increased by 21%. The percentage increase in the time period of the pendulum of increased length is

Options

A.11%
B.21%
C.42%
D.10%

Solution

Time period of simple pendulum is given by.
    T = 2π
New length l′ = l +
∴    
       
⇒     T′ = T + T
        T ≠ 10% of T.

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