Question

The breaking stress of aluminium is 7.5x 10 7 N/m 2 . Find the greatest length of aluminium wire that can hang vertically without breaking. Density of aluminium is 2.7x10 3 kg/m 3 .

Answer 1

given,
$\frac{mg}{A}$ = 7.5×10⁷
$\frac{m}{A}$ = 7.5×10⁶
∵g = 10 m/sec²
$\frac{m}{V}$ = 2.7×10³
$\frac{m}{A×<span>L}$ = 2.7×10³
$\frac{m}{A×2.7×10³}$ = L
$\frac{7.5×10⁶}{2.7×10³}$ = L
L = 2.78×10³ m

Answer 2

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