A solid iron rectangular block of dimensions 4.4 m , 2.6 m and 1 m is cast into a hollow cylindrical pipe of internal radius 30 cm and thickness 5 cm.Find the length of the pipe.
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volume of cylindrical pipe=volume of rectangular block.
volume of external cylinder-volume of interal cylinder=l*b*h
`piR^2h-pir^2h=l*b*h`
`pih(R^2-r^2)=l*b*h`
`pi*h(35+30)(35-30)=4.4*2.6*1`
`h=112m.`