what is the efficiency of a machine that can carry a load of 100 kg with an effort of 20N when its velicity ratio is 10

The electronic structure or chlorine is 2.8.7 what is the electronic structure of fluorine?

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?

What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) acceleration