- #1
fobbz
- 27
- 0
Homework Statement
http://img694.imageshack.us/img694/1115/pendulumcutquestion.jpg [Broken]
Please ignore the blue pen.
Homework Equations
Ek=1/2 mv2
Ep=mgh
The Attempt at a Solution
Basically I looked at the problem firstly as the pendulum has reached the lowest point, therefore having an Ep of 0 and an Ek . Then I took a final point, where the string is cut. At this point there is Ek and Ep is there not?
The height would therefore be from the bottom of the swing, to the place where it's cut, which equals
6.4 - 6.4cos(30)
So now I have this
Ek= Ek2 + Ep
0.5mv2 = 0.5m(vsin30)2 + mgh
Am I on the right track?
What do I do after this? I don't know what my next move should be...
Should I use the point where the string is cut , and set it equal to the ball at the top of the height's energy?
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