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?

Solution:Step 1We need to find the new wire of diameter it haveSo the diameter of wire depends on length of the wireThe young’s modulus FL Y = r lWhere, L is the length of the wire and,l is the change in length.