Atennis ball is hit into the air with a racket. when is the ball’s kinetic energy the greatest? ignore air resistance. a. when it leaves the racket b. just before it reaches the ground c. when it reaches its maximum height d. when its kinetic energy and potential energy are equal e. just before it starts falling downward

What is created when solids,liquids,an gases mix with one another

Does anyone know how to solve this problem? i really need . i made an attempt but i just cant get it. a metal rod is 25.000 cm long at 25.0 degrees celsius. when heated to 102.0 degrees celsius, it is 25.054 cm long. what is the coefficient of linear expansion for this metal.

Abird flies directly overhead from where you stand at an altitude of 300.0 m and at a speed horizontal to the ground of 20.0 m/s. the bird has a mass of 2.0 kg. the radius vector to the bird makes an angle \thetaθ with respect to the ground. the radius vector to the bird and its momentum vector lie in the xyxy-plane. what is the bird’s angular momentum about the point where you are standing?