If a spear is thrown at a fish swimming in a lake, it will often miss the fish completely. why does this happen?

If the ama of the inclined plane below is 2, calculate the ima and efficiency. ima = efficiency =

Explain why electric current cannot exist if a current doesn't have a voltage source.

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?