16. Consider a fixed hemispherical bowl of radius R with its opening horizontal. One end of a light rod of length l= R is hinged at a point Á on the brim of the bowl. A small bead of mass m is attached at the other end the rod. Initially the bead is held at a point B also on the brim and then released. Find the tensile force in the rod when the bead passes the lowest position. Acceleration of free fall is g. Ans: R mg J3

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!