Question

A metal pipe is 1.4 m long. Its internal diameter is 25 mm and thickness 1 mm. If 1 mm³ of the metal weighs 0.02 gm, find the weight of the pipe.​

Answer 1

The weight of the pipe is 2287.4gm.

What is Unit of Measurement?

It is definite magnitude of a quantity, defined and adopted by convention or by law, that is used as a standard for measurement of the same kind of quantity.

It is given,

A metal pipe is 1.4 m long

Length of metal pipe is 1.4m=1400mm

Its internal diameter is 25 mm

Radius =12.5mm

Thickness=1mm

outer radius=12.5+1=13.5mm

volume of pipe=

V=π(R²−r² )h

V=3.142(13.5²-12.5²)1400

V=3.142(182.25-156.25)1400

V=3.142(26)1400

V=114368.8

1 mm³ of the metal weighs 0.02 gm

So  1.4 m long metal weights 114368.8×0.02=2287.4gm

Hence,  the weight of the pipe is 2287.4gm.

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