What is the Damping Coefficient in a Pendulum's Dampened Oscillation?

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The discussion focuses on calculating the damping coefficient in a pendulum's dampened oscillation, specifically for a pendulum of length 1.00 m released from an initial angle of 15.0°. After 1200 seconds, the amplitude decreases to 5.5°, leading to the determination of the value of b/2m using the formula w = sqrt(W[SIZE="1"]0^2 - (b/2m)^2). The correct approach involves substituting the initial angular frequency W[SIZE="1"]0 with sqrt(g/L), where g is the acceleration due to gravity and L is the pendulum length.

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[SOLVED] Dampened Oscillations Problem

A pendulum of length 1.00 m is released from an initial angle of 15.0°. After 1200 s, its amplitude is reduced by friction to 5.5°. What is the value of b/2m?

How do you do this one? I know it has something to do with the formula w= sqrt(W0^2 - (b/2m)^2). I tried plugging in sqrt(g/L) for W0, but I don't know what to use for the first w.
 
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Never mind. It turns out I was using the wrong formula.
 

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