An engine absorbs 1 . 6 8 1 . 6 8 kJ from a hot reservoir at 2 7 7 2 7 7 0 C

 

 An engine absorbs $1\mathrm{.}68$ kJ from a hot reservoir at $277$⁰ C and expels $1\mathrm{.}18$ kJ to a cold reservoir at $27$ ⁰C in each cycle. 

 

$($a$)$ What is the engine's efficiency? 

$($b$)$ How much work is done by the engine in each cycle?

 $($c$)$ What is the power output of the engine if each cycle lasts $0\mathrm{.}304$ s$?$