Andy has a bath and uses 1500g of water heated from 10°c to 40°c and with a specific heat capacity of 4200j/kg°c how much energy does he use

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