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lec19 - L ECTURE 19 R EVIEW AND O VERVIEW Unanswered...

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L ECTURE 19: R EVIEW AND O VERVIEW Unanswered questions Philosophical Interlude More unanswered questions Final logistics
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Car Questions 1. In a rear wheel drive car, why does the rear end of the vehicle attempt to pull in front of the front end, resulting in a side-ways or drifting motion? 2. How fast would a racecar (with spoilers) have to go in order to have enough down force to drive upside down in a tunnel? 3. It would be interesting to know more about car racing.
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From The Physics of NASCAR “When air molecules encounter a wing, some air molecules go over the wing and some go under. If the force unser the wing is larger than the force over the wing, there is a net force pushing up, which is called lift. If the force pushing down is larger than the force pushing up, the net force is down. Airplane designers call this negative lift, but race engineers call it downforce.” “Drag coefficients of passenger cars are 0.28 (Camry) or 0.33 (Fusion); Indy cars have drag coefficients around 1.00.” “Passenger cars have lift coefficients from + 0.10 to + 0.40, while a stock car may have a lift coefficient around -0.42. Indy cars have lift coefficients that range from -2.00 to -3.00.”
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1. Which kind of force is
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