Example 1.4: A merry-go-round usually consists of a central vertical pillar. At the top of it there are horizontal rods which can rotate about vertical axis. At the end of this horizontal rod there is a vertical rod fitted like an elbow joint. At the lower end of each vertical rod, there is a horse on which the rider can sit. As the merry-go-round is set into rotation, these vertical rods move away from the axle by making some angle with the vertical. 2.1 m 1.5 m The figure above shows vertical section of a merry-go-round in which the 'initially vertical' rods are inclined with the vertical at 370, during rotation. Calculate the frequency of revolution of the merry-go-round. (Use g = 12 m/s2 and sin 370 = 0.6)