A hollow iron pipe is 21 cm long and its external diameter is 8 cm. Sf the thickness of the pipe is 1 cm and iron weighs \[\mathbf{8}\text{ }\mathbf{g}/\mathbf{c}{{\mathbf{m}}^{\mathbf{3}}}\], then the weight of the pipe is:

A hollow iron pipe is 21 cm long and its external diameter is 8 cm. Sf

1.	A hollow iron pipe is 21 cm long and its external diameter is 8 cm. Sf the thickness of the pipe is 1 cm and iron weighs \[\mathbf{8}\text{ }\mathbf{g}/\mathbf{c}{{\mathbf{m}}^{\mathbf{3}}}\], then the weight of the pipe is:
A.	3.6 kg
B.	3.696 kg
C.	36 kg
D.	36.9 kg
E.	None of these
Answer» C. 36 kg

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A hollow iron pipe is 21 cm long and its external diameter is 8 cm. Sf the thickness of the pipe is 1 cm and iron weighs \[\mathbf{8}\text{ }\mathbf{g}/\mathbf{c}{{\mathbf{m}}^{\mathbf{3}}}\], then the weight of the pipe is:

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