Question 291: Thermodynamics & KTG

Question

A Carnot engine takes 5000 kcal of heat from a reservoir at 727$^\circ$C and gives heat to a sink at 127$^\circ$C. The work done by the engine is

Accepted Answer

Efficiency $\eta  = 1 - {{{T_L}} \over {{T_H}}}$
$ = 1 - {{400} \over {1000}} = 0.6$
$ \Rightarrow 0.6 = {W \over Q}$
$ \Rightarrow W = 0.6Q = 3000$ kcal $=12.6 	imes {10^6}$ J

Answer

3 $	imes$ 10
6
J

Answer

Zero

Answer

12.6 $	imes$ 10
6
J

Answer

8.4 $	imes$ 10
6
J

Thermodynamics & KTG

A Carnot engine takes 5000 kcal of heat from a reservoir at 727^\circC and gives heat to a sink at 127^\circC. The work done by the engine is

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