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Question
Find the weight of a lead pipe 35 cm long. The external diameter of the pipe is 2.4 cm and the thickness of the pipe is 2mm, given 1 cm3 of lead weighs 10 gm.
Solution
External radius 'R' = 1.2 cm
Internal radius 'r' = 1.0 cm ...(Since internal radius = external radius - thickness)
Height 'h' = 35 cm
∴ Volume of the pipe = πh[ R2 - r2 ]
= `22/7` x 35 x [(1.2)2 - (1.0)2]
= 48.4 cm3
∴ Weight of lead pie = 10 x 48.4 = 484 gm.
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