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Finding the differential equation for a oscillating system

by JustinLiang
Tags: differential, equation, oscillating
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JustinLiang
#1
Dec8-12, 04:49 AM
P: 82
1. The problem statement, all variables and given/known data



3. The attempt at a solution
I don't think this is the correct answer because for some reason I have a constant mg term. Usually I get mgsinθ and from small angle approximations it becomes mgθ, but this time I am getting mgcosθ and from small angle approximations it becomes mg.



What am I doing wrong? Or is this correct?
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haruspex
#2
Dec8-12, 05:14 AM
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I don't see the distances in your expressions for the moments.
theBEAST
#3
Dec8-12, 03:17 PM
P: 368
Quote Quote by haruspex View Post
I don't see the distances in your expressions for the moments.
I just tried this question and did it with the distances, but I also don't understand why there is a constant term. That term is throwing me off.

haruspex
#4
Dec8-12, 04:09 PM
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Finding the differential equation for a oscillating system

Quote Quote by theBEAST View Post
I just tried this question and did it with the distances, but I also don't understand why there is a constant term. That term is throwing me off.
Please post your working if you'd like further assistance.


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