Question

A simple pendulum has a string of length l and bob of mass m when the bob is that its lowest position it is given the minimum horizontal speed necessary for it to move in a circular path about the point of suspension the tension in the string at the lowest position of the bob is

Answer 1

Explanation:

conservation of energy.

at the highest position tension in string is zero .now we proceed

mg=mv^2/l at tje highest position

v^2=gl

now at the lowest position

apply conservation of energy

1/2mv^2+mg.2l=1/2mv'^2

v'2=5gl

where v'is velocity of bob at lowest position

now, T=6mg