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:

Explanation:

It's given that,

=> Energy absorb by a heat engine due to heat = 360J  

=> Work W = 25J  

=> The energy expelled to the cold reservoir in each cycle, Qc = ?

=> Efficiency of the engine, e :

e = W/Qh

e = 25 J / 360 J

e = 0.069

e = 6.9%

=> The energy expelled in each cycle:

e = W / Qh = Qh - Qc / Qh

 

e = 1 - Qc / Qh

1 - [Qc/Qh] = e = 0.069

[Qc/Qh] = 1 - 0.069

[Qc/Qh]  = 0.931

Qc  = Qh * 0.931

Qc = ( 360J ) (0.931)

Qc = 335 J

=> Thus, The energy expelled to the cold reservoir in each cycle is 335 J.