A boy ties a rock of mass M to a string and swings it in a circle of radius R with constant velocity v. The plane of the circle makes an angle of θ with the horizontal. Determine an equation for the tension in the string as a function of the constants given and the angle α.α is the angle measured around the circle with α= 0° at the highest point and α = 180° at the lowest point. α increases in the same direction as v.