Pendulum problem


by physicshelp98
Tags: pendulum
physicshelp98
physicshelp98 is offline
#1
Apr24-10, 07:12 PM
P: 3
1. The problem statement, all variables and given/known data

a 2 kg pendulum of length 7 meters is moving at 1 m/s, calculate how high (h) the pendulum will rise; and the resultant angle.


2. Relevant equations
1/2mv2 = mgh

cos = Y/L

h = L ( 1- cos )


3. The attempt at a solution

1/2(2)(1)^2 = (2)(9.8) h
1 = 19.6h
1/19.6h
h = .051

just dont know how to go about gettign resultant angle
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ideasrule
ideasrule is offline
#2
Apr24-10, 08:15 PM
HW Helper
ideasrule's Avatar
P: 2,324
Have you tried drawing a diagram and writing out a trigonometric relationship using that diagram?
physicshelp98
physicshelp98 is offline
#3
Apr24-10, 08:43 PM
P: 3
yeah i did and got h= 7 tan[tex]\theta[/tex], how would you find the actual angle that what im having difficult with.


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