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Question

A man grows into a giant such that his linear dimensions increase by a factor of 9. Assuming that his density remains same, the stress in the leg will change by a factor of
(Assume cubical shape of man with L as edge length)

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Solution

We know stress is given by
Stress=ForceArea=mgA=ρVgA(ρ=mV)
i.e., stress L3L2 (L is the linear dimension).
stress L
Since linear dimension increases by a factor of 9, stress also increases by a factor of 9.

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