the angular momentum of a spinning wheel decreases from 8.4 to 4.7 kg x m^2/s over a period of 2.1 s. *what is

Question

what is the angular impulse that slowed the wheel?

Answer 1

Impulse is ∆(momentum), which in this case 3.7 kg*m^2 / s
The torque is ∆(momentum) / ∆T; so that would be 1.76 N*m.