A metal pipe has internal radius of 2.5 cm. The pipe is 2 cm thick all round. Find the weight in kilogram, of 2 metres of the pipe if 1 cm cube of the metal weighs 7.7 g.
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Step-by-step explanation:
internal radius=2.5cm=r
external radius=2.5+2=4.5cm=R
h=200cm
vol.of pipe = vol. of external pipe-vol. of internal pipe
=πR²h-πr²h
=22/7×4.5×4.5×200-22/7×2.5×2.5×200
=8800cm³
mass of pipe =8800×7.7
=67760g
=67.76kg
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