A hollow iron pipe is 21cm long and its external diameter is 8cm. If the thickness of the pipe is 1cm and iron weighs 8g/cm 3 , then the weight of pipe is :
Answer: 3.696kg
Explanation
Volume of iron =π(R2−r2)×h
=π(42−32)×21
=722×(16−9)×21
=462cm2
Weight =10008×462kg=3.696kg
Weight =10008×462kg=3.696kg
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