1.

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) 1/4a

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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