The tires of a car make 65 revolutions as the car reduces

Chapter 2, Problem 21P

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QUESTION:

Problem 21P

The tires of a car make 65 revolutions as the car reduces its speed uniformly from 95 km/h to 45 km/h. The tires have a diameter of 0.80 m. (a) What was the angular acceleration of the tires? (b) If the car continues to decelerate at this rate, how much more time is required for it to stop?

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QUESTION:

Problem 21P

The tires of a car make 65 revolutions as the car reduces its speed uniformly from 95 km/h to 45 km/h. The tires have a diameter of 0.80 m. (a) What was the angular acceleration of the tires? (b) If the car continues to decelerate at this rate, how much more time is required for it to stop?

ANSWER:

Step 1 of 4

Part (a)

The final angular velocity can be expressed as,

                                                                       

For , ,

                                                                     

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