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18. Acinder block of mass m = 4.0 kg is hung from a nylon string that is wrapped around a frictionless pulley having the shape

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18. Acinder block of mass m = 4.0 kg is hung from a nylon string that is wrapped around a frictionless pulley having the shape of a cylindrical shell, as shown in the figure. If the cinder block accelerates downward at 2.45 m/s? when it is released, what is the mass M of the pulley? (for cylindrical shell, | = MR?) N M| =l m

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