The area under the line and above the axes on a velocity vs. time graph represents what?

The diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island

If the new moon happens on january 15th, what shape will it be on february 6th?

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?