Angular momentum L (which change disc speed) can be found:
L=J∗(ω2−ω1)
where J - disc's moment of inertia, ω2 - finish angular speed ω1 - start angular speed.
Moment of inertia for disc can be found:
J=2m×r2
where m - mass of the disc, r - radius of the disc.
Angular speed for correct calculation have to be transformed from rev/s to rad/s.
1rev/s=2×πrad/s
So we have:
L=2m×r2×(ω2−ω1)
L=23×0.62×(15×2×π−10×2×π)=16.956skg×m2
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