- #1

Faefnir

- 10

- 0

$$ \omega = 20 \frac{round}{s} = 126 \frac{rad}{s} $$

$$ t = 20 min = 1200 s $$

The braking moment intensity is equal to the speed with which the angular moment changes. Because the wheel is stopped at the time ## t = 1200 s##

$$ t = 1200 s $$

$$ \Delta L = I \cdot \omega $$

$$ \tau = \frac{I \cdot \omega}{t} = \frac{245 kg \cdot m^2 \cdot 126 \frac{rad}{s}}{1200 s} = 25.725 N \cdot m $$

The text provides a result of ## 513 N \cdot m ##. What was wrong with reasoning?