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Find the Mass of a cylindrical iron pipe 2.1m long and 12cm in external diameter,if the metal is 1cm thick and of density 7.8g/come(take π to be 22/7)
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Find the Mass of a cylindrical iron pipe 2.1m long and 12cm in external diameter ,if the metal is 1cm thick and of density 7.8 g/cm3 (take π to be 22/7).

volume of pipe = external volume - internal volume

                        =(π*R2*L)-(π*r2*L)

                        =(22/7*122*(2.1*10-2))-(22/7*(12-1)2*(2.1*10-2))

                        =9.504-7.986=1.518 cm3 

mass of pipe=density*volume=7.8*1.518=11.8404 gm.

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