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A question and solution around centripetal force

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A car wheel of radius r rolls without slipping at a constant translational acceleration a. At one instant, the velocity of the axel is v. What net force acts on a small pebble of mass M stuck to the edge of the wheel along the X axis. Repeat for along y axis.

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The solution discusses what net force acts on a small pebble of mass M stuck to the edge of the wheel along the X axis.

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{See attachment for diagram}.

Nett Force in x direction Fxs by Newton's law the product of the ...

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