What is a Physics Fight and How to Investigate Magnet Oscillations?

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Discussion Overview

The discussion revolves around investigating the oscillation of a movable magnet positioned above a fixed magnet, framed within the context of a "physics fight." Participants explore the differential equations governing the system and propose various methods for analysis.

Discussion Character

  • Technical explanation
  • Mathematical reasoning
  • Debate/contested

Main Points Raised

  • One participant presents the governing equation for the oscillation of the movable magnet, introducing terms related to mass, damping, and magnetic interaction.
  • Another participant suggests a substitution to simplify the equation, proposing the use of a Riccati equation and perturbation methods, while expressing that an exact solution may not be feasible.
  • A participant questions the origin of a specific substitution (z = y * exp(-bt/2m)) and requests a detailed solution with steps for better understanding.
  • Another participant points out a discrepancy between two equations presented, highlighting differences in the placement of the |y|^2 term and clarifying that |y|^2 equals y^2 for real numbers.
  • A participant expresses a lack of contribution to the mathematical solution but seeks clarification on the term "physics fight."

Areas of Agreement / Disagreement

Participants exhibit a mix of agreement and disagreement, particularly regarding the equations presented and the methods for solving them. There is no consensus on the best approach to take or the definitions involved.

Contextual Notes

Some assumptions about the nature of the oscillation and the definitions of terms are not explicitly stated, leading to potential ambiguity in the discussion. The mathematical steps and methods proposed remain unresolved.

Who May Find This Useful

This discussion may be of interest to those studying differential equations, magnetism, or those involved in physics competitions or collaborative problem-solving environments.

chooxani
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I am doing a physics fight and the problem I've got to solve is as follows:
Two magnets are arranged on top of each other such that one of them is fixed and the other one can move vertically. investigate the oscillation fo the magnet.

The equation is

my''-by'-((m_1*m_2)/(miu*4*pi*|y|^2))=0

or where k=-(m_1*m_2)/(miu*4*pi),

m*y'' - b*y' - k*|y|^2 = 0
 
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chooxani said:
I am doing a physics fight and the problem I've got to solve is as follows:
Two magnets are arranged on top of each other such that one of them is fixed and the other one can move vertically. investigate the oscillation fo the magnet.

The equation is

my''-by'-((m_1*m_2)/(miu*4*pi*|y|^2))=0

or where k=-(m_1*m_2)/(miu*4*pi),

m*y'' - b*y' - k*|y|^2 = 0
Put y'=p, y'' =p dp/dy. Rearranging, you get a Riccati equation in p and y.
Therefore, it would be unjust to insist on the exact solution. I suggest that we substitute z=y* exp(-bt/2m) and simplify the equation.We could either linearise tthe equation or use the perturbation methods.
 
thanks but where did z come from? also could u please write the 'solution' with the steps? bear with me but i need to understand this thing right.
 
my"- by'- b|y|^2= 0 is not at all like the first equation you wrote:
my''-by'-((m_1*m_2)/(miu*4*pi*|y|^2))=0.

One has the |y|^2 in the numerator and the other in the denominator. By the way, as long as y is a real number, |y|^2= y^2 so you don't need the "| |".

As for "where did z come from", Eynestone just gave it to you. He is defining z to be y* exp(-bt/2m) in hopes that this substitution will simplify the equation.
 
I'm sorry, I have little to contribute in terms of solving the DE, but I must ask: what is a physics fight?
 

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