What atom has this expanded electron configuration? 1s² 2s² 2p²

What is the momentum of a 2 kg object moving at 15 meters per second

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?

Wind and moving water provide energy. question 1 options: chemical mechanical thermal none of the above