Question

  1. 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?
  2. 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?

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