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With what minimum angular velocity a biker should rotate in a circular motion on the wall of a death well so that it does not fa

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From the figure 

We can say that 

The minimum angular velocity a biker should rotate in a circular motion on the wall of death well so that it does not fall down

will be given by 

\omega_{min}=\sqrt{\frac{g}{\mu r}}

where 

 \omega _{min} = minimum angular velocity

\mu=coefficient of friction

r = radius of Rotor

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