4. A block of mass m= 5.00 kg is released from rest from point A and slides on the frictionless track shown in in the diagram. Determine (a) the block's speed at points
B and C and (b) the net work done by the gravitational force on the block as it
moves from point from A to C.​

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

Need asap ‼️ 20 pts which gravitational force field diagram is drawn correctly? (answers in pictures below)

Amoving electron has kinetic energy k1. after a net amount of work w has been done on it, the electron is moving one-quarter as fast in the opposite direction. (a) find w in terms of k1. (b) does your answer depend on the final direction of the electron's motion?