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In the given system, when the ball of ma...

In the given system, when the ball of mass m is released, it will swing down the dotted arc.
a. How fast will it reach the lowest point in its swing? A nail is located at a distance d below the point of suspension.

b. Show that d must at `0.6l`, if the ball is to swing completely around a circle centered along the nail.
c. If `d=0.6l`, find the change in tension in the string just after it touches the nail.

A

`15 cm`

B

`4 cm`

C

`9 cm`

D

None of threr

Text Solution

Verified by Experts

The correct Answer is:
C
Velocity of bob at `C` should be sqrt(5gR)
` (##A2Z_XI_C06_E01_149_S01.png" width="80%">
`sqrt(5g(R-L)) = sqrt (2gR)`
`5(R-L) = 2R`
`3R = 5L`
`L = (3)/(5) R = (3)/(5) xx 15 = 9 cm`
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