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Q:

A hollow iron pipe is 21 cm long and its exterior diameter is 8 cm. If the thickness of the pipe is 1 cm and iron weights $$ 8 g/cm^3 $$, then the weight of the pipe ($$ π= {22\over7}$$) is. 

  • 1
    3.696 kg
  • 2
    3.6 kg
  • 3
    36 kg
  • 4
    36.9 kg
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Answer : 1. "3.696 kg "

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