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Question: the aerodynamic drag of a new car is to be...

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The aerodynamic drag of a new car is to be predicted at a speed of 60 mph. Automotive engineers built a one-third scale model of the car to test in a wind tunnel. The temperature of the wind tunnel is the same as that of the expected operational temperature of the actual (prototype) car. (a) Determine how fast the air should move in the test section of the wind tunnel to achieve similarity between the model and the prototype. The aerodynamic drag on the model in the wind tunnel is measured to be 33.5 lb when the similarity condition is achieved. (b) Estimate the drag force on the prototype (full-scale) car.

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