Statement of a problem № 42140


Speedometer your car s speedometer converts the angular speed of the wheels to the linear speed of the car, assuming standard-size tires and no slipping on the pavement. (a) If your car s standard tires are 24 inches in diameter, at what rate (in rpm) are your wheels rotating when you are driving at a freeway speed of 60 mi/h? (b) Suppose you put oversize, 30-inch-diameter tires on your car. How fast are you really going when your speedometer reads 60 mi/h? (c) If you now put on undersize, 20-inch-diameter tires, what will the speedometer read when you are actually traveling at 50 mi/h?

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