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A small block of mass m is placed on top...

A small block of mass `m` is placed on top of a smooth hemisphere also of mass `m` which is placed on a smooth horizontal surface. If the block begins to slide down due to a negligible small impulse, show that it will loose contact with the hemisphere when the radial line through vertical makes an angle `theta` given by the equaition `cos^3theta-6costheta+4=0`.

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