The $1lb$ ball located at $A$ is released from rest and travels down the curved path. $($Figure $1)$

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If the ball exerts a normal force of $4lb$ on the path when it reaches point $B,$ determine the angular momentum of the ball about the center of curvature, point $O.$ Hint Neglect the szze of the ball. The radius of curvature at point $B$ must first be determined.

Express your answer to three significant figures and include the appropriate units.

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