Imagine you are lifting a toy car above your head and then holding it stationary above your head. while it is stationary what forces do you think act on the toy car?

a. applied and gravity

b. normal and applied

c. gravity and normal

d. tension and spring

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