An electric heater supplies heat to a system at a rate of \( 100 \mathrm{~W} \). If the system d...

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An electric heater supplies heat to a system at a rate of \( 100 \mathrm{~W} \). If the system does work at a rate of \( 75 \mathrm{~J} \) per second, at what rate is the internal energy increasing?
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