An airplane propeller is 2.08 m in length (from tip to tip) and has a mass of 117 kg. When the airplane's engine is first started, it applies a constant torque of 1950 Nm to the propeller, which starts from rest. How much work in joules is being done after 5 revolutions? This is what I did: (1.04*1950)*(5*2*pi). Mastering physics says it is close, but not correct.