A uniform thin hemispherical shell is ke...

A uniform thin hemispherical shell is kept at rest and in equilibrium on an inclined plane of angle of inclination `theta=30^(@)` as shown in figure. If the surface of the inclined plane is sufficiently rough to prevent sliding then the angle `alpha` made by the plane of hemisphere with inclined plane is :

value of `mu` is needed

`30^(@)`

`45^(@)`

`60^(@)`

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