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  3. an engineer is designing a rearwheeldrive car the car without...

Question: an engineer is designing a rearwheeldrive car the car without...

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An engineer is designing a rear-wheel-drive car. The car (without its engine) weighs 2000 lb and has a 100-inch wheelbase, drivetrain efficiency of 80%, 14-inch-radius wheels, an overall gear reduction ratio of 10 to 1, and a center of gravity (again, without the engine) that is 22 inches above the roadway surface and 55 inches behind the front axle. Engines considered weigh 4 lb for each ft-lb of torque that they produce and would be placed in the front portion of the car. Calculations show that the cars center of gravity moves 1 inch closer towards the front axle for every 15 lb of engine weight added (but it stays the same height above the roadway surface). If the car is starting from rest on a level paved roadway surface with coefficient of adhesion equal to 0.8, what engine size (weight and associated torque) will provide the highest possible tractive effort? 4.

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