Which of the following is not an example of a girl on a bike who is accelerating?

Awind turbine is rotating counterclockwise at 0.5 rev/s and slows to a stop in 10 s. its blades are 20 m in length. (a) what is the angular acceleration of the turbine? (b) what is the centripetal acceleration of the tip of the blades at t=0s? (c) what is the magnitude and direction of the total linear acceleration of the tip of the blades at t=0s?

Is the portion of the electromagnetic spectrum that has a frequency just above that of visible light.

What are two examples of phase changes that skip a phase during transition?