Whenever there is a change of state, such as a solid to liquid or liquid to gas, heat energy can be added without a temperature
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The work output of the procedure is given as,
Substitute the known values,
Thus, the work output is 180 J.
The work input of the procedure is,
Substitute the known values,
Thus, the work input is 250 J.
The efficiency of the person is given as,
Substitute the known values,
Thus, the efficiency of person is 0.72 or 72%.