Question
In the figure shown, a rod of length 24cm is pivoted near an end in horizontal plane. At the free end a simple pendulum of length 24 cm is suspended. The system is made to rotate with angular velocity ω so that the string makes an angle 37° with vertical. Find ω.

Solution
Rod of length = 24 cm
Length of simple pendulum = 24 cm
Angular velocity,
= 37o, with the vertical.
From the figure below, the bob will rotate in a horizontal circle of radius of radius r given by,

Length of simple pendulum = 24 cm
Angular velocity,

From the figure below, the bob will rotate in a horizontal circle of radius of radius r given by,

