A hollow iron pipe is 21 cm long and its external diameter is 8 cm. If – McqOptions

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1.	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 weights 8 g/cm3, then the weight of the pipe is:
A.	.6 kg
B.	.696 kg
C.	6 kg
D.	6.9 kg
Answer» C. 6 kg

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