Author Topic: A hollow iron pipe is 21 cm long and its external diameter is 8 cm. If the thic  (Read 182 times)

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Question:  A hollow iron pipe is 21 cm long and its external diameter is 8 cm. If the thickness of the pipe is 1 cm and iron weighs 8 g/cm3, then the weight of the pipe is:

Options are:

A.     3.6 kg
B.     3.696 kg
C.     36 kg
D.     36.9 kg

Correct answer is:

B.     3.696 kg

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