Question

A bob of pendulum of length 2 m describes an are of a circle in a vertical plane. If the lension in the cord is 2.5 times the weight of the bob for the position shown, find the velocity of the bobs at that position.

Answer 1

Hi..


Let T be tension in the string
The bob has a centerpetal force mv2l
T−mgcosθ=mv2l
2mg−mgcos30=mv22
v=5.66m/s.


Hope this helps u!