Question

A bob of mass 200gm is suspended by a thread of length 100 cm is drawn aside making an angle of 60 deg with the vertical what is the increase in potential energy​

Answer 1

Answer: 0.55

Explanation:

Length of simple pendulum =1m

Mass =1wgm=0.1kg

It is displaced through as angle of 60 for vertical

Height of pendulum at starting position = length (1−ws60)

                                                                  =1(1−0.5)

                                                                  =0.5m

Potential energy =mgh=0.1×10×0.5=0.55

when it is released and it reaches mean position its potential energy at starting point is converted to kinetic energy.

so K.E. of bob at mean position =0.55.

Hence, the answer is 0.55.