Question

weight 8 g/cm", find the weight of pipe.
9. A iron pipe is 21 m long and its exterior diameter is 8 cm. If the thickness of the pipe is 1 cm and iron
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Answer 1

Volume of hollow iron pipe =π{R2−r2}×h

=π{42−32}×21

=227×7×21      =22×21

=462cm3

Now 1cm3=8g

462cm3=8×462g

=3696g=3.696kg

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