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 ($$ = {22 over7}$$) is.

A hollow iron pipe is 21 cm long and its exterior diameter is 8 cm. If

1.	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 ($$ = {22 over7}$$) is.
A.	3.696 kg
B.	3.6 kg
C.	36 kg
D.	36.9 kg
Answer» B. 3.6 kg

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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 ($$ = {22 over7}$$) is.

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