Unformatted text preview: f ( t ) models a spring system that with one spring, one end of the spring is ﬁxed and a object with 1 unit mass attached at one end. The Hook’s constant k = 4 . f ( t ) is external force applied to the system. In the Example 3.3, the force sin(2 t ) only applied at ﬁrst π unit of time (second). The following diagram compares the solution of this equation with diﬀerent input f ( t ) ....
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- Spring '11