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Plot the results of Prob. 1 in the permissible range.

Prob. 1

Using the result of Prob.2 , determine the amplitude of motion of a spring-rn ass system with Coulomb damping when excited by a harmonic force Fo sin wt. Under what condition can this motion be maintained?

Prob. 2

Coulomb damping between dry surfaces is a constant D always opposed to the motion. Determine the equivalent viscous damping.

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