# Circuit and spring

Given I(0)=Q(0)=0, find the charge and current at a time t in a RLC circuit, if R=4ohms, L=2henries, C=0.5farads, and V(t)=2e^-t volts.

Find the position and velocity of a mass m attached to a spring of constant k when subjected to an oscillating force F(t)=FsinBt.

See the attached file.

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#### Solution Summary

The solution provides an example of solving a circuit problem and a position-velocity-spring problem.

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