A ball of mass m=5.65kg moves in a horizontal circle as shown in the diagram. It is

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A ball of mass m=5.65kg moves in a horizontal circle as shown in the diagram. It is supported by two ropes of length l=5.38m which each make an angle of a=50.7 degree with the vertical. The tension of the lower rope is 1=6.15N. What is tension(T2) in the upper rope?