Question 36

66 cubic centimetres of silver is drawn into a wire of 1mm diameter. The length of the wire in metres will be :

Solution

Volume will be same 
Let length be h
we get :
$$66\ =\pi\ \times\ \frac{1}{20}\times\ \frac{1}{20}\times\ x$$
Cross multiplying
we get x=8400 cm or 84 metres


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