1.

A hollow cylindrical tube open at both end is made of iron 2 cm thick. If the external diameter be 50 cm and the length of the tube is 210 cm, find the number of cubic cm of iron in it.

Answer»

Solution :External radius (R) = 25 cm
Internal radius (r) = (25-2)= 23 cm
VOLUME of IRON = `pi h(R^2-r^2)`
= `(22)/7 xx 210 xx (25^2-23^2)`
=`63360 cm^2`


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