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A simple AC circuit contains an AC source with output voltage

V_max cos(?t)

and a resistor with resistance

R = 140.0 Ω.

(a) What is the angular frequency of the AC source if the first time

V_R = 0.340V_max

is at

t = 1.80 ✕ 10⁻³ s?

(b) When is

V_R = 0.850V_max

for the first time?

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