The elastic limit of brass is 379MPa.What should be the mininum diameter of a brass rod if it is to support a 400 N load without exceeding its elastic limit?

  • Option 1)

    1.00mm

  • Option 2)

    1.16mm

  • Option 3)

    0.90mm

  • Option 4)

    1.36mm

Answers (1)

As we know that

\frac{F}{A}=stress

=\frac{400\times 4}{\pi d^{2}}

=379\times 10^{-6}

\Rightarrow d^{2}=1.34\times 10^{-6}

\Rightarrow d= 1.15\times 10^{-3}m

 


Option 1)

1.00mm

Option 2)

1.16mm

Option 3)

0.90mm

Option 4)

1.36mm

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