Find the center of mass of each of the following:
(a) Athin wire bent into the form of a three-sided, block-shaped "Ll"with each segment of
equal length b
(b) A quadrant of a uniform circular lamina of radius b
(c) The area bounded by parabola y =x2/b and the line y =b
(d) The volume bounded by paraboloid of revolution z = (x2 +y2)/b and the plane z = b
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