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Question

A simple pendulum, composed of a bob of mass m connected to the end of a massless rod, executes simple harmonic motion as it swings through small angles of oscillation.The maximum angular displacement with the vertical is denoted by θmax. Frictional effects and variation of acceleration due to gravity are negligible.
Which one of the following would enable you to calculate the length of the pendulum?
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A
The mass of the bob
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B
The period of the oscillations
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C
The tangential acceleration at θ=0
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D
The maximum speed of the bob
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E
The acceleration at θ=θmax
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Solution

The correct option is B The period of the oscillations
For the small oscillation, the motion of the pendulum can be treat as a simple harmonic motion. So, time period of a SHM is T=2πlg
Thus, time period would enable you to calculate the length of the pendulum.

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