Perturbation Theory: How Does Oscillation Amplitude Vary with Length?

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SUMMARY

The discussion focuses on the variation of oscillation amplitude (q_max) in a pendulum as its length is doubled over time, represented by the equation l = l_0(1 + epsilon*t) for 0 <= t <= 1/epsilon. The relationship derived indicates that the maximum amplitude of oscillation changes according to the formula q_max(t) = q_max(0)(l(0)/l(t))^3/4. This highlights the dependence of amplitude on the pendulum's length and the initial conditions of the system.

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  • Understanding of basic pendulum mechanics
  • Familiarity with perturbation theory
  • Knowledge of energy conservation in oscillatory systems
  • Ability to manipulate algebraic equations involving powers and roots
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  • Explore the derivation of energy equations for oscillating systems
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Homework Statement


The length of a pendulum is slowly doubled (l=l_0(1+epsilon*t), 0<=t<=1/epsilon). How does the amplitude q_max of the oscillations vary?

Any hints?


Homework Equations





The Attempt at a Solution

 
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Are you changing the total energy? By how much?
 
I'm not sure...Ans. I = 1/2 * l^{3/2} * g^{1/2} *q_max^{2}.

therefore

q_max(t) = q_max(0)(l(0)/l(t))^3/4
 

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