An electric heater supplies heat to a system at a rate of 120 W. If system performs work at a rate of 80 J s-1, the rate of increase in internal energy is

Question

An electric heater supplies heat to a system at a rate of

120 W

. If system performs work at a rate of

80 J s^{- 1}

, the rate of increase in internal energy is

30 J s^{- 1}

40 J s^{- 1}

50 J s^{- 1}

60 J s^{- 1}

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