# When a spring with natural frequency /2 is driven with a sinusoidal force sin(t) with

## Question:

When a spring with natural frequency λ/2π is driven with a sinusoidal force sin(ωt) with ω ≠ λ, it oscillates according to

Let

(a) Use L’Hôpital’s Rule to determine y_{0}(t).

(b) Show that y_{0}(t) ceases to be periodic and that its amplitude |y_{0}(t)| tends to ∞ as t → ∞(the system is said to be in resonance; eventually, the spring is stretched beyond its structural tolerance).

(c) Plot y for λ = 1 and ω = 0.8, 0.9, 0.99, and 0.999. Do the graphs confirm your conclusion in (b)?

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