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As shown in Fig. 9-5, a 0.90-kg body attached to a cord is whirled in a vertical circle of radius 2.50 m. (a) What minimum speed vt must it have at the top of the circle so as not to depart from the circular path? (b) Under condition (a), what speed vb will the object have at the bottom of the circle? (c) Find the tension FTb in the cord when the body is at the bottom of the circle and moving with the critical speed vb. |
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