Method of undertermined coefficients

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SUMMARY

The discussion focuses on solving the differential equation of an undamped mass-spring system, specifically 2x" + 36x = sin(wt). The method of undetermined coefficients is employed to find a particular solution when the frequency w is not resonant. The participants confirm that the solution involves first addressing the homogeneous equation before determining the particular solution. The resonance condition is identified as the values of w that satisfy the equation's natural frequency.

PREREQUISITES
  • Understanding of second-order differential equations
  • Familiarity with the method of undetermined coefficients
  • Knowledge of homogeneous and particular solutions
  • Basic concepts of resonance in mechanical systems
NEXT STEPS
  • Study the characteristics of second-order linear differential equations
  • Learn the method of undetermined coefficients in detail
  • Explore the concept of resonance in mass-spring systems
  • Practice solving differential equations with varying frequencies
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Students studying differential equations, mechanical engineers, and anyone interested in the dynamics of mass-spring systems.

lordy12
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Homework Statement


The motion of an undamped mass-spring system is described by the differential equation 2x" + 36x = sin(wt)

a) For what values of w will the system exhibit resonance?
b) Use the method of undertermined coefficients to find a particular solution in the case where w is not the resonant frequency.





I know I have to use y = Asin(wt) but I am stuck after that.
 
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Do you know how to solve a second-order differential equation? First you solve the corresponding homogeneous equation, then find a particular solution, then add the two. You may find it easier to do a) after doing b).
 

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