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# rev_test3 - PHYSICS 1 EAST LA COLLEGE TEST#3 Review(Ch 6 8...

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PHYSICS 1, EAST LA COLLEGE TEST #3 Review (Ch 6 8) Mr. V. Kiledjian 1) a) In a revolution type ride with R = 20 meters, how fast would you have to go at the top in order to not fall off? b) How fast would you have to go at the top in order to feel your regular weight? Three times your weight? c) In a colossus type ride with R = 20 meters, what is the maximum you should go at the top? How fast should you go to feel half your weight? d) For either ride, how fast should you go to feel half your weight at the bottom? Three times your weight? (For all of these parts, derive the equations then plug in the numbers!!!!) 2) A car weighs 2000 lbs and is making a turn around a banked curve of angle 25 degrees where the coefficient of static friction equals 0.4 and the radius of curvature is 100 feet. What is the maximum and minimum safe driving speeds that the car can go at? [First derive the equation for either the minimum or maximum speeds and then you can switch the signs for the other one. You have to derive one o f them; you can’t just use a formula] If you are driving 10 ft/sec below the maximum speed, what is the magnitude and direction of f s and the magnitude of N?

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