a brass sphere filled with mercury acts as a bob of simple pendulum.the sphere has a hole at its bottom through which mercury is constantly oozing out.how will its time period vary with time.plzzz do not send any link.

Hello Dazy dear, length of the pendulum is the distance between the point of suspension and CG of the bob
Now as mercury is filled, initially CG will be at the centre
As mercury oozes out then CG will go down and so length increases. Thereby period decreases
When all mercury comes out then CG goes back to the centre and so once again period attains the initial value.