The torque produced by a 2.5-L automobile engine operating at full throttle was measured over a range

Question:

The torque produced by a 2.5-L automobile engine operating at full throttle was measured over a range of speeds (Figure P8.12). By using this graph of torque as a function of the engine’s speed, prepare a second graph to show how the power output of the engine (in the units of hp) changes with speed (in rpm).

Figure P8.12

140 120 80 60 40 20 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 Engine speed, rpm Torque, ft- Ib