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 equation2.list out your known variables3.plug the numbers into the equations4.solve5.write your solution statement that includes initial energy and final energy added

2500 J

Step-by-step explanation:

As we know that from first law of thermodynamics we have

here we know that

Q = heat given to the system

W = work done by the system

= change in internal energy of the system

now we will have

Q = 1000 J

Work done by the piston = 500 J

so work done by system of gas = (work done by piston)

now from above equation we have

now we know that

So final internal energy of the gas is 2500 J while initial internal energy is given as 2000 J

-13

step-by-step explanation:

f(x)=2x-5 for f(-4)

f(-4)   means let x=-4

f(-4) = 2(-4) -5

f(-4) =-8-5

      = -13

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step-by-step explanation: