Answer :
A total of -700 J worth of heat energy is transferred from the system.
Data provided
W = - 500 J is the amount of work the system has done. (A bad indication that the system needs work)
U = -100 J represents the reduction in thermal energy (internal energy). (A negative sign indicates a decrease)
Use the first law of thermodynamics, which states that the sum of the work done and the thermal energy is equal to the overall heat given to the system. Therefore,
Q = W + U
Q = - 500 + (-200)
Q = - 700 J.
A negative indication indicates that the system is losing heat energy.
As a result, -700 J of heat energy is transferred from the system.
Learn more about the first law of thermodynamics here:
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