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5. A bead of mass m is free to slide on a frictionless wire bent in the shape of a cosine curve y - a cos (k), where a and b are constant. Gravity points in the negative y direction. Suppose the bead starts at rest at the top of a peak. a. Find the radius of curvature of the point at the bottom of a trough. b. Find the tangential and normal components of the acceleration of the bead at the bottom of a trough. c. Find the constraint force (normal force) vector exerted by the wire on the bead at the bottom of a trough.

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