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

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