As drawn in Fig. 9-6, a 20-g bead slides from rest at A along a frictionless wire.

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As drawn in Fig. 9-6, a 20-g bead slides from rest at A along a frictionless wire. If h is 25 cm and R is 5.0 cm, how large a force must the wire exert on the bead when it is at 

(a) Point-B and 

(b) Point-D?h B R Fig. 9-6 D F mg (b)

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