physics

an amusement park ride consists of a rotating circular platform 7.4 m in diameter from which 10 kg seats are suspended at the end of 1.81 m massless chains. when the system rotates, the chains make an angle of 26.6 degree with the vertical. the acceleration of gravity is 9.8 m/s^2.
a). what is the speed of each seat?
answer in units of m/s
b). if a child of mass 49.1 kg sits in a seat, what is the tension in the chain ( for the same angle)? answer in units of N

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