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  4. The elastic limit of brass is 379MPa . The minimum diameter of a brass rod if it is to support a 400N load without exceeding its elastic limit is:

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Q. The elastic limit of brass is $379MPa$ . The minimum diameter of a brass rod if it is to support a $400N$ load without exceeding its elastic limit is:

NTA AbhyasNTA Abhyas 2020

Solution:

Stress $=\frac{F}{A}=\frac{400}{\pi \frac{d^{2}}{4}}=379\times 10^{6}$
$\frac{400 \times 4}{\pi \times 379 \times 10^{6}}=d^{2}$
$d=1.159\times 10^{- 3}m$
$d\approx1.16mm$