(Answered) A rock of mass m slides from a to b along the inside of a

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A rock of mass m slides from A to B along the inside of a frictionless hemispherical bowlwith negligible air resistance.

356_frictionless hemispherical bowlwith.jpg

It is released from rest at point A.

a. Draw a free body diagram of the rock at point B.

b. Derive an expression for the magnitude of the Normal force on the rock at pointB. Simplify your answer as much as possible.
(Use Conservation of Energy)

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