A tractor-trailer truck has a drag area CDA = 8 m2 bare and CDA = 6.7 m2 with a deflector added (Fig. 7.18b). Its rolling

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A tractor-trailer truck has a drag area CDA = 8 m2 bare and CDA = 6.7 m2 with a deflector added (Fig. 7.18b). Its rolling resistance is 50 N for each mi/h of speed. Calculate the total horsepower required if the truck moves at (a) 55 mi/h; and (b) 75 mi/h.

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