1. A truck tire rotates at an initial angular speed of 21.5 rad/s. The driver steadily accelerates, and after 3.50 s the tire’s angular speed is 28.0 rad/s. What is the tire’s angular acceleration during its linear acceleration?
2. Find the angular acceleration of a radiator fan blade as its angular speed increases from 8.50 rad/s to 15.4 rad/s in 5.20 s.