In: Physics
Heat flows from a reservoir at 373 K to a reservoir at 273 K through a 0.39-m copper [thermal conductivity 390 J/(s
Rate of Heat trasfer per unit time is given by
R= (where K is thermal conductivity of material , A is area , d is thickness and (T2 -T1) is temprature difference )
R=
R=97 J/S
so heat transfer in 2.9 min
2.960=174 second
heat transffer in 174 sec= 97174 J
=16878 J
and efficiency of carnot engine is
E=
E=273-173/273
E=(0.366 100 ) %
E=36.6 %
heat not being used 63.4%
so heat unvailable for use =63.4% of 16878
=10700.65J (ANS)