A student measures the diameter of a pendulum bob with a vernier calipers and the distance from the point of suspension to the lower end of the bob with a metre scale. The corrected bob diameter is 2.64 cm and the suspension-to-lower-end distance is 102.8 cm. The effective pendulum length is:
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Question

A student measures the diameter of a pendulum bob with a vernier calipers and the distance from the point of suspension to the lower end of the bob with a metre scale. The corrected bob diameter is 2.64 cm and the suspension-to-lower-end distance is 102.8 cm. The effective pendulum length is:

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G1 Physics · Accepted Answer

The effective length is from the point of suspension to the centre of the bob. Radius = 2.64/2 = 1.32 cm. Effective length = 102.8 − 1.32 = 101.48 cm.