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Diff eq, Spring/mass damped/drivenAm I doing this right?! 
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#1
Oct2510, 08:19 PM

P: 190

1. The problem statement, all variables and given/known data
1.) After a 10lb weight is attached to a 5ft spring, the spring measures 7ft. The 10lb is replaced with 8lb, and placed in a medium offering resistence equal to the instantaneous velocity. A) find the equation of motion if the weight is released 0.5ft below equilibrium with downward vel of 1ft/s. B) What are the amplitude and period of the motion? How many complete vibrations does the weight complete in [tex]2\pi[/tex] seconds? C) Find the times at which the weight passes through the equilibrium position heading downward. 2.) A mass of 1 slug, when attached to a spring, stretches it 2ft and then comes to rest in the equilibrium position. Starting at t=0, an external force equal to f(t)=8sin4t is applied to the system. Find the equation of motion if the surrounding medium offers a damping force numerically equal to 8 times the instantaneous velocity. Thanks.. 3. The attempt at a solution 1.) 2.) I left it with C_{1} and C_{2} b/c no initial cond were given. 


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