Which statement about elements in the same family is true? a. they have similar atomic sybolsb. they have similar chemical properties c. they appear in the same row on the periodic table. d. they are in the same state of matter at room temperature

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?