The bob of a pendulum is made of hollow brass sphere. What happens to the time period of the pendulum, if the bob is filled with water completely? Why?

Suppose the bob of a simple pendulum is made up of ice. What will happen to the time period if the ice starts melting?

A bob of pendulum was filled with Hg and entire Hg is drained out, then the time period of pendulum

What will be the effect on the time period of the pendulum if the mass of the bob is increased for the same length?

The matallic bob of a simple pendulum has the relative density rho . The time period of this pendulum is T it the metallic bob is immersed in water the new time period is given by