The bob of a simple pendulum is a hollow sphere. If it is half-filled with water, what will be the effect on its frequency?

The bob of a simple pendulum is hollow. If half of it is filled with water, what will be the effect on its time period?

Time period of a simple pendulum is 2 s. If its length is doubled, then the new time period will be

The bob of a simple pendulum is made of iron. A powerful magnetic pole is placed below the bob in its equilibrium position. How will the time period of the pendulum change?

The bob of a simple pendulum executes simple harmonic motion in water with a period T, while the period of oscillation of the bob is T_(0) in air. Neglecting frictional force of water and given that the density of the bob is 4/3xx10^(3)kg*m^(-3) . Prove that, T=2T_(0) .