Drag Force on Toyota Camry & Hummer 1. To maintain a constant speed, the force provided by a car's engine must equal the drag force plus theforce of friction of the road (the rolling resistance).(a) What are the drag forces at 60 km/h and 95 km/h for a Toyota Camry? Assume that the drag areais 0.70m² and the drag coefficient C= 0.28. Use the density of air 1.21 kg/m³. Assume all values areaccurate to three significant digits.Enter to 3 significant figuresDrag force at 60 km/h, FD1=Drag force at 95 km/h, Fp2 =By what factor does of the drag force increase from 60 km/h to 95 km/h?Enter to 3 significant figuresFD2/FD1 =✓Check: Is this ratio consistent with the fact that drag force is directly proporational to thesquare of the velocity?✔NN(b) What are the drag forces at 60 km/h and 95 km/h for a Hummer H2? Assume that the drag areais 2.44m² and the drag coefficient for a Hummer C=0.64.Enter to 3 significant figures=Drag force at 60 km/h, FD1Drag force at 95 km/h, FD2 =By what factor does of the drag force increase from 60 km/h to 95 km/h?Enter to 3 significant figures✔NN (b) What are the drag forces at 60 km/h and 95 km/h for a Hummer H2? Assume that the drag areais 2.44m² and the drag coefficient for a Hummer C=0.64.Enter to 3 significant figuresDrag force at 60 km/h, FD1=✔NNDrag force at 95 km/h, FD2 =By what factor does of the drag force increase from 60 km/h to 95 km/h?Enter to 3 significant figuresFD2/FD1✓Reflect:1. Which drag force do you predict to be bigger, the drag force on the Toyota Camry or the drag forcethe Hummer? Does your answer support your predition?2. Do you predict the factor of increase of the drag force for the two speeds same or different for thetwo vehicles? Why? Does your answer support your predition?

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To maintain a constant speed, the force provided by a car's engine must equal the drag force plus the force of friction of the road (the rolling resistance). (a) What are the drag forces at 60 km/h and 95 km/h for a Toyota Camry? Assume that the drag area is 0.70m² and the drag coefficient C= 0.28. Use the density of air 1.21 kg/m³. Assume all values are accurate to three significant digits. Enter to 3 significant figures Drag force at 60 km/h, FD1 = Drag force at 95 km/h, FD2 = N N

To maintain a constant speed, the force provided by a car's engine must equal the drag force plus the force of friction of the road (the rolling resistance). (a) What are the drag forces at 60 km/h and 95 km/h for a Toyota Camry? Assume that the drag area is 0.70m² and the drag coefficient C= 0.28. Use the density of air 1.21 kg/m³. Assume all values are accurate to three significant digits. Enter to 3 significant figures Drag force at 60 km/h, FD1 = Drag force at 95 km/h, FD2 = N N

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter5: Analysis Of Convection Heat Transfer

Section: Chapter Questions

Problem 5.49P

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3.) Automotive engineers work very hard to improve the value of the drag coefficient for cars. Suppose you have a car with a mass of 3000. kg and an effective surface area of 4.00 m^2. The engine can generate a maximum force of 28,000. N. Let the coefficient of kinetic friction be 0.200, and the coefficient of static friction be 0.400. Air has a density of 1.21 kg/m^3. (back on earth) (3a) Draw a free-body diagram for your car, including both drag and friction, when the car is moving at its maximum velocity. (3b) If the maximum value of your car's velocity is 150.0 m/s, then what is the drag coefficient for the car? (3c) Suppose your engineers change the drag coefficient to 0.300 - what would be your maximum velocity then with the same force from your engine.
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