One - fourth length of a uniform rod is ...

One - fourth length of a uniform rod is placed on a rough horizontal surface and it starts rotating about the edge as soon as we release it. The rod starts slipping on the edge when it has turned through an angle `theta`. If the coefficient of friction between rod and surface is `mu`, and it satisfies the relation `x tan theta=4mu`, then what is the value of x? `["Take "g=10m//s^(2)]`

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