4. The following homogeneous solid with mass m is formed by revolving the area shown about the y-axis. (a) Draw perpendicular triangular partion to y-axis with thickness of dy, (b) find dm, (c) find m, (d) write the relation for dly, (e) use part (d) to determine the moment of inertia for mass of the the figure with respect to the y-axis. 2² = y R

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