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xternal diameter of a lead pipe is 2.4 cm and the thickThe emm. Find the weight of a pipe of length 7 m, it being givenbeing gwenthat 1 cu cm of lead weighs 10th of the pipe, h = (7 Ă 100) cm-700 |
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Answer» External diameter = 2.4 cm so external radius of 2.4 cm /2 = 1.2 cm. Since thickness is 2 mm hence inner radius = external radius - thickness = 1.2 cm - 0.2 cm = 1 cm. Height = 700 cm Now the Volume of the Metal = π * h ( externa radius square - internal radius square ) π*700( 1.2² - 1²) or 22*700/7 ( 1.44 - 1 ) = 2200 * .44 = 968 cubic centimeter. Now the weight of the lead = 986 * 10 gram = 9680 gram or 9.680 kilogram. |
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