[填空题]
The tires of a car make 6ve s+db1idl(gh yw5ff ;5ba 575 revolutions as the car reduces its speed 8mikla r9h3(n1 swfx/uniformly frans /1 9hm 38(rxkwlifom 95km/h to 45km/h The tires have a diameter of 0.80 m. (a) What was the angular acceleration of the tires? $\approx$ $rad/s^2$ (b) If the car continues to decelerate at this rate, how much more time is required for it to stop? s