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A pendulum consists of a bob of mass m attached to a string of length L. It is pulled aside so that the string makes an angle Θ with the vertical and is released from rest. Find the speed v at the bottom of the swing and the tension in the string at that time.


What a hard question.
You use the energy equations and the centripetal force equations to fin the answers.

..help?
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A photo of Beejeong Beejeong
[quote=lashes]
I'm bored, so what the hell...


step #1: determine release height relative to the height at bottom of the swing:

dH = L(1 - cos(Θ))


step #2: Use the energy equation to determine velocity at bottom of swing:

m*g*(dH) = .5*m*(dV)^2


step #3: Use V in step 2 to determine tension at bottom of swing:

T = m*(V^2/r - g)


wtf is dH = L(1 - cos(Θ))?

I didn't understand you to be honest..
Any better way of explaining?
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