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A small block of mass m os takes slowly ...

A small block of mass m os takes slowly up a fixed hemisphere from `P` to `Q` and then slowly down along its surface from `Q` to `S` by force `F`, which at each point of the surface, is tangential to the surface. If the coefficient of friction is `mu`, then the work performed by the force `F` in taking the block from `P` to `S` along the hemispherical surface of radius `R` is :

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