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Question

A pendulum clock consists of an iron rod connected to a small, heavy bob. If it is designed to keep correct time at 20C, then how fast or slow will it go in 24 hours at 40C? Co-efficient of linear expansion of iron = 1.2×106/C.


A
2.08 sec, slow
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B
2.08 sec, fast
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C
1.04 sec, slow
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D
1.04 sec, fast
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Solution

The correct option is B 1.04 sec, slow
Δt=12αΔθt=12×α×Δθ×86400

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