A teacher applies a force to a wall and becomes exausted. Was work done on the unmoving wall?

What is relative velocity? in which condition is relative velocity known by adding the velocity of the first body and that of the second body

A0.580-kg rock is tied to the end of a string and is swung in a circle with a radius of 0.500 meters. the velocity of the rock is 4.50 m/s. what is the centripetal force acting on the rock? 15.5 n 5.22 n 69.8 n 23.5 n

How can waves travel through ground?