Tire Rotations and Frequency

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  a)find the number of rotations of a tire in 1 hour if the car is driven at 55 mph.

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  The radius of the tire = 20 inches/2 = 10 inches. Initially height = 0 and so the point is the lowest one on the tire that touches the ground.

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  /50 rotations per day Therefore f2 = 10,000 x 1/50 = 200 rotations per day The solution calculates the rate of rotation of the collapsed star.

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  (b) The frequency is the number of rotations per second = (number of rotations per minute)/(60 seconds) = 120 round/min / ( 60 sec/min) = 2 (round/sec) = 2 Hz, and the period is T = 1/(2 Hz) = (1/2) sec (c) This is a somewhat psychological

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  Ed's Tires and Brakes has two locations, one on the northwest side of town and one on the southeast side of town. At both locations are performed routine tire repairs and rotations, as well as expensive brake repairs.

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  So for the same traveling distance, the wheel with greater diameter will make less rotations and thus is more durable. 2.

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  Many car dealers compete with automotive service and repair businesses by offering "maintenance for life" packages that cover scheduled oil changes and tire rotations.