What does frequency mean?
a- how many waves or cycles pass a certain point in one second
b- how many waves or cycles pass a certain point in one hour
c- how many waves or cycles exist at one time
d- how many waves or cycles pass in a certain point in one minute

With these questions , 15 pts & brainliest

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?

If an electric circuit is not grounded it is best to reach out and touch it to provide the ground a.true or b.false