Question on: SS1 Physics - Heat and Thermodynamics II
A heat engine has an efficiency of 25% and releases 400 J of heat energy to a low-temperature sink. How much work is done by the engine?
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Efficiency = (Work output / Heat input) x 100%
           Work output = Efficiency x Heat input
           25% = Work output / (Heat input - 400 J)
           Work output = 0.25 x (Heat input - 400 J)
           Work output = 0.25 x Heat input - 100 J
           Heat input - 100 J = 400 J
           Heat input = 500 J
           Work output = 0.25 x 500 J - 100 J = 25 J
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