For the PE formula, why Is the height required for calculations? Why do we need to know the height in order to determine PE?

An object moves from position +34m to the position -15m in 15 seconds. what is the total displacement? what is the total velocity?

If an atom contains 11 protons in its nucleus, predict the element with the atomic number and electronic configuration. will the number of electrons remain the same during the chemical reaction in such an atom? explain.

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j? 1. write the equation 2.list out your known variables 3.plug the numbers into the equations 4.solve 5.write your solution statement that includes initial energy and final