A person stands in contact against the i...

A person stands in contact against the inner wall of a rotor of radius r. The coefficient of friction between the wall and the clothing is `mu` and the rotor is rotating about vertical axis. The minimum angular speed of the rotor so that the person does not slip downward is

`sqrt((mu g)/(r))`

`sqrt((mu r)/(g))`

`sqrt((g)/(mu r))`

`sqrt(mu r g)`

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