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A metallic rod breaks when strain produc...

A metallic rod breaks when strain produced in the rod is `0.2%`. The young's modulus of the material of the rod is `7 xx 10^9 N/m^2`. What slould be it's area of cross section to support a load of `10^4` N.

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Breaking stress = Y xx breaking strain = `7 xx 10^9 xx 2/1000 = 14 xx 10^6 N/m^2` `there for` but breaking stress F/A `there for` `F/ "breaking stress" = `10^4/(14 xx 10^6) = 7.14 xx 10^-4 m^2`
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