may you solve it and tell me why you put the cos in the denominator please?

A "swing" ride at a carnival consists of chair that are swung in a circle by 14.4 m cables attached toa vertical rotating pole, as the drawing shows. Suppose the total mass of a chair and its occupant is 280 kg. (a) Determine the tension in the cable attached to the Chair. (b) Find the speed of the chair. 60.0 (a) (b) Number 5490 Number 14.5 Units Units m/s