a 21 cm long cylindrical iron pipe has exterior diameter 8cm . if the thickness of the pipe is 1cm and iron weighs 8g/cm³, then find the weight of the pipe
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Answer:
Volume of iron =π(R 2−r 2 )×h
=π(4^2−3^2)×21
= 7/22 ×(16−9)×21
=462cm^2
Weight =
8×462 /1000 kg=3.696kg
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