670 J of work are done on a system in a process that decreases the system's thermal energy by 10 J. How much?670 J of work are done on a system in a process that decreases the system's thermal energy by 10 J. How much heat energy is transferred to or from the system?
I know its from the system but how many Joules?
Posted by schmiso
Change of system's internal energy equals work done On it plus heat heat transferred to it.
∆U = W + Q
thus,
Q = ∆U - W = -10J - 670J = -680J
So 680J of heat are transferred. Negative sign indicates that heat is transferred from the system.
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