physics question A "swing" ride at a carnival consists of chairs that are swung

Chase

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in a circle by 12.0 m cables? A "swing" ride at a carnival consists of chairs that are swung in a circle by 12.0 m cables attached to a vertical rotating pole, as the drawing shows. (? = 60.0°) Suppose the total mass of a chair and its occupant is 210 kg.
(a) Determine the tension in the cable attached to the chair.
(b) Find the speed of the chair.
 
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