In a heat engine if 1000 j of heat enters the system and the piston does 500j of work, what is the final internal energy of the system if the inital 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 energy added.

Step-by-step explanation:

To solve this problem, we must use the first law of thermodynamics that says that the net heat absorbed by a system is equal to the sum of the work done plus the change of internal energy.

* = final internal energy of the system

* = initial internal energy of the system

* = Work done by the system

* = Heat added to the system

Then:

The final internal energy of the system is 2500 J. This means that by adding 1000j of heat to the system the internal energy increased by 500J

3.4 pizzas

step-by-step explanation:

given is a scatter plot showing number of pizzas sold during weeks for different issues of coupon

y represents number of pizzas sold and x number of coupons issued

y is marked verticaly and x horizontally

the trend line is given as

y =3.4x+43

this says that even when no coupon is issued pizzas sold will be 43

and rate of change of pizza sold for 1 unit of coupon = slope = 3.4

i.e. when x increases by 1 unit y increases by 3.4 units

hence for each additional coupon issued 3.4 pizzas more will be sold