- #1

auk411

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- 0

## Homework Statement

Figure 2 shows a pendulum with a point-like pendulum bob on a string with a length = L fixedly attached to a support so as to form a friction-less pivot-point P. The bob is released at rest from the height of the pivot point. The bob swings to its lowest point where upon the string makes contact with a very thin horizontal bar positioned a distance d below the pivot point of the pendulum. The bob continues traveling past its lowest point with a new pivot point P’ and reduced radius of curvature and is barely able to travel to the top of the bar in a circular path. Find a very simple expression for d in terms of L.

see attachment

## Homework Equations

Work done by gravity = mgh

Radius of smaller circle = L -D

Fnet = T - mg = mv^2/r

## The Attempt at a Solution

?

someone at least show me how I'm supposed to be setting this up.