Question

A turbine fan in a jet engine has MOI 2.5 kg m² about its axis of rotation. Its angular velocity is 40t². Find the net torque at any instant.

• A. 100 t
• B. 100 t²
• C. 200 t
• D. 200 t²

Answer 1

Answer: (C)

200 t

Answer 2

τ = $\frac{dL}{dt} = \frac{d}{dt}(I\omega) = \frac{d}{dt}\left( 2.5 \times 40t^{2} \right) = 200t$