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Potential Energy Is Defined for a System

An aluminium ...

Question

An aluminium rod has a breaking strain of 0.2% the minimum cross sectionall area of the rod in square meter in order to support a load of 10power4N is if youngs modulls is 7×10power9 N/square metres

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Solution

There's a calculation error there in the last step. The answer on solving will be 7.1 x 10^(-4)

If you do the calculations as shown, you'll get the same answer.

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