Question
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A metre stick is pivoted about its centre.A piece of wax of mass 20g travelling horizontally and perpendicular to it at 5m/s strikes and adheres to one end of the stick so that the stick starts to rotate in a horizontal circle. Given the moment of inertia of the stick and the wax about the pivot is 0.02kg m2, what is the initial angular velocity of the stick?
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What is the moment of inertia of a uniform semicircular wire of mass m and radius r, about an axis passing through its centre of mass and perpendicular to its plane?