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mcafej
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Homework Statement
A mass of 4 kg is stretches a spring by 1 m. An external force of cos (!t)
N acts on the mass. Assume that the damping constant is nonzero and gravity is 10 ms^-2.
Consider a spring mass system described by the following IVP.
u''+yu'+u = cos(wt)
u(0) = 0
u'(0) = 0
1) Find the amplitude of the spring mass system in terms of w and y.
The Attempt at a Solution
The solution says
R2 = 1/((1-w2)2+w2y2)
But how is that the solution, I can't find how to compute the amplitude in my textbook, it just says R2=A2+B2.