If the tennis player serves the ball horizontally (q = 0), calculate its velocity v if the center of the ball clears the 36-in. net by 4 in. also find the distance s from the net to the point where the ball hits the court surface. neglect air resistance and the effect of ball spin.

The necleus of an atom is made up of what subatomic particles?

Electric field of the earth. the earth has a net electric charge that causes a field at points near its surface equal to 150 n> c and directed in toward the center of the earth. (a) what magnitude and sign of charge would a 60-kg human have to acquire to overcome his or her weight by the force exerted by the earth’s electric field? (b) what would be the force of repulsion between two people each with the charge calculated in part (a) and separated by a distance of 100 m? is use of the earth’s electric field a feasible means of flight? why or why not?

Ways that industry and agriculture use physical properties to separate substances