Question

A simple pendulum with brass Bob has a period t the Bob is now immersed in non viscous liquid is 1\8 of brass the time period of same pendulum will be

Answer 1

Answer:

the timeperiod of the same pendulum may be increased.

Answer 2

Answer:

Wo = d V g   where d is density of brass and V the volume of pendulum

B = buoyant force = (d / 8) V g      weight of liquid displaced

W = Wo - B     apparent weight of pendulum in liquid

W = d V g (1 - 1/8) = 7 / 8 Wo

So the pendulum experiences an apparent gravitational acceleration of      7 g / 8

Since the period of the pendulum is given by

T = 2 pi * (L/g)^1/2

T / To = (g / (7 g / 8))^1/2 = (8 / 7)^1/2

The period increases due to an apparent decrease in the gravitational force.