Fifteen joules of heat are added to a cylinder with a piston. The system uses 7 joules of energy to raise the piston upward. By how much did the internal energy of the system increase?

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asked Aug 26, 2020 66.2k views

3 votes

Fifteen joules of heat are added to a cylinder with a piston. The system uses 7 joules of energy to raise the piston upward. By how much did the internal energy of the system increase?

Physics
middle-school

Leo The Lion asked

by Leo The Lion

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1 Answer

3 votes

Answer:

8 J

Step-by-step explanation:

Heat = work + change in internal energy

Q = W + ΔU

15 J = 7 J + ΔU

ΔU = 8 J

Baraa answered Sep 1, 2020

by Baraa

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