## College Physics (4th Edition)

The magnitude of the torque is $~50~N \cdot m$
The angular impulse is equal to the change in angular momentum. We can use the change in angular momentum to find the torque: $\tau~t = \Delta L$ $\tau = \frac{L_f-L_0}{t}$ $\tau = \frac{(115~kg~m^2/s)-(240~kg~m^2/s)}{2.5~s}$ $\tau = -50~N \cdot m$ The magnitude of the torque is $~50~N \cdot m$.