Question 349: 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 $$	imes$$ 106 J

Answer

Zero

Answer

12.6 $$	imes$$ 106 J

Answer

8.4 $$	imes$$ 106 J

Thermodynamics & KTG

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

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