In a given city, the permissible limit of co (carbon monoxide) in the air is 100 parts per million (ppm). the city monitors the steady rise of co from various sources annually. in which year (rounded off to the nearest integer) will the co level exceed the permissible limit?

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?