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  4. A simple pendulum has a string of length l and bob of mass m. When the bob is at 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 :

Q. A simple pendulum has a string of length and bob of mass . When the bob is at 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 :

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Solution:

The minimum velocity that should be imparted to the bob so that it completes vertical circle is

At lowest position,


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