Pls help me do these physic questions

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

How does the formation of intrusive and extrusive igneous rocks differ?

Failure to accomplish erikson’s psychosocial task of late adulthood leads to despair. a. true b. false