A boy rides his bicycle which has wheels of radius 31.0 cm. If the boy accelerates from rest to a speed of 11.8 m/s in 30.0 s, what is the angular acceleration (in rad/s2) of the tires?

Plzz 10 points ! is some thermal energy always released during a transformation ? and is potential chemical energy always transformed into kinetic energy

Awind turbine is initially spinning at a constant angular speed. as the wind's strength gradually increases, the turbine experiences a constant angular acceleration 0.173 rad/s2. after making 2870 revolutions, its angular speed is 132 rad/s. (a) what is the initial angular velocity of the turbine? (b) how much time elapses while the turbine is speeding up?

What is the acceleration of a spaceship that is initially at rest and then speeds up to 220 m/s in 20 seconds