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 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 axis by making some angle with the vertical. The figure above shows vertical section of a merry go round in which the 'initially vertical ' rods are inclined with the vertical at `37^@`,during rotation. Calculate the frequency of revolution of merry go round.` (Use g=pi^2ms^-2 and sin37^@=0.6)`