anonymous 4 years ago A pendulum oscillates in a vertical plane, length of string is 1m. At what point vertically below the point of suspension must a nail be fixed so that bob starts revoluting about the nail as its centre? Pendulum makes 60degree with the vertical. Pl.answer with explanation

1. anonymous

are u asking for the point where there is maximum oscilaton of the pendulum when the nail is fixed?

2. anonymous

|dw:1328459143953:dw| initial potential energy of bob = mg(1/2) = kinetic energy at lowest point = (1/2)mv^2 frm here v = $\sqrt{10}$ now to complete a circle a speed to $\sqrt{5gx}$ (radius of circle) is required.. $\sqrt{5gx}$ = $\sqrt{10}$ => x = 0.2 (from lowest point).

3. anonymous

*edit now to complete a circle a speed of $\sqrt{5gx}$ (x is radius of circle) is required..

4. anonymous

very nice explanation

5. anonymous

@^ thank you.