Using energy to solve circular motion problems

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Homework Help Overview

The discussion revolves around a problem related to circular motion and energy conservation, specifically examining the relationship between spring energy and kinetic energy in a given scenario.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants are questioning the validity of equating spring energy to kinetic energy in the context of the problem. There is a focus on understanding the principles behind energy distribution and the reasoning for a potential "50-50 split" of energy.

Discussion Status

The discussion is ongoing, with participants exploring different interpretations of energy conservation principles. Questions about the assumptions underlying the energy relationship are being raised, indicating a productive exploration of the topic.

Contextual Notes

There appears to be confusion regarding the application of energy principles to the problem, particularly in how energy is partitioned between kinetic and spring forms. The original poster's attempts to apply energy conservation are being critically examined.

flyingpig
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Homework Statement



[PLAIN]http://img251.imageshack.us/img251/1764/66016056.jpg

Solutions

[PLAIN]http://img213.imageshack.us/img213/6821/99132292.jpg


The Attempt at a Solution



Now here is my question, why exactly can we not approach this problem using Energy to part a) by setting spring energy = kinetic energy?

I tried it and I got an answer similar, except there is a square root
 
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flyingpig said:
Now here is my question, why exactly can we not approach this problem using Energy to part a) by setting spring energy = kinetic energy?

I tried it and I got an answer similar, except there is a square root
Based on what principle should the kinetic energy be equal to the spring energy? Why should there be a 50-50 split of the energy initially added to the mass?
 
Kinetic energy of the stone (the tangential speed) is equal to the spring energy? What do you mean 50-50 split?
 
flyingpig said:
Kinetic energy of the stone (the tangential speed) is equal to the spring energy? What do you mean 50-50 split?
It was your idea.
flyingpig said:
Now here is my question, why exactly can we not approach this problem using Energy to part a) by setting spring energy = kinetic energy?
Total energy = Kinetic energy + spring energy
If, as you say, spring energy = kinetic energy, then there is a 50-50 split of the total energy. I am wondering why you think that is true.
 

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