Question

The bob of 0.2 m pendulum describes an arc of a circle in a vertical plane if the tension in the cord is root 3 times the weight of the bob when the cord makes an angle 30 degree with the vertical the acceleration of the bob in the position is

Answer 1

Let T be tension in the string

The bob has a centerpetal force mv2lmv2l

T−mgcosθ=mv2lT−mgcos⁡θ=mv2l

2mg−mgcos30=mv222mg−mgcos⁡30=mv22

v=5.66m/s