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The density of a certain rod a foot long varies directly as the square of the distance from one end. Find the centre of gravity.(a) 4/3a(b) 3/4a(c) 1/3a(d) 1/4aThis question was addressed to me in class test.I want to ask this question from Centres of Gravity and Moments of Inertia of Area topic in division Development of Surfaces, Isometric Projections, Perspective Projections & Transformation of Projections of Civil Engineering Drawing |
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Answer» RIGHT CHOICE is (B) 3/4a Best EXPLANATION: Place the ROD on the x-axis, one end at the origin so that ρ = kx^2, where a is the length of the rod. |
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