Acarnot engine has an efficiency of 0.537, and the temperature of its cold reservoir is 379 k.
(a) determine the temperature of its hot reservoir.
(b) if 6580 j of heat is rejected to the cold reservoir, what amount of heat is put into the engine?

(A) Th = 818.6 K

(B) Qh = 14211.7 J

Explanation:

efficiency (n) = 0.537

temperature of cold reservoir (Tc) = 379 K

heat rejected (Qc) = 6580 J

(A) find the temperature of the hot reservoir (Th)

 n = 1 -

0.537 = 1 -

= 1 - 0.537 = 0.463        

Th =

Th = 818.6 K

(B) what amount of heat is put into the engine (Qh) ?

from

Qh = 6580 ÷

Qh = 14211.7 J

it is b. absorbs thermal energy