Question

A heat engine absorbs $360J$ of energy by heat and performs $25J$ of work in each cycle. The energy expelled to the cold reservoir in each cycle is:

• A. $335J$
• B. $14.4J$
• C. $360J$
• D. $385J$

Answer 1

Answer: (A)

$335J$

Given, $E=360J$
Energy expelled to the cold reservoir in each cycle, i.e. heat given by the system
$△Q=△U+△w$
[from first law of thermodynamics]
$△W=△Q-△U$
$△W=360-25$
$=335J$