Fluorine and Chlorine are very reactive elements. Which prediction best explains this phenomena? A. Both elements are stable atoms. B. Both elements form a +1 ions. C. Both elements are metalloids. D. Both elements only need one more valence electron to fill their outer shell.

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?