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A large number (n) of identical beads, each of mass m and radius r are strung on a thin smooth rigid horizontal rod of length L(L>>r) and are at rest at random positions. The rod is mounted between two rigid support (see fig) . If one of the beat is now given a speed v, the average force experienced by each support after a long time is (assume all collision are elastic ):

mv2Lnrmv2L2nrmv22(Lnr)zero

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