Adiabatic means dQ =0
hence - du = dw .
Hence - du = 50 J
The internal energy falls by 50 J
Further fall of 20J means total fall of internal energy is 70 J
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hence - du = dw .
Hence - du = 50 J
The internal energy falls by 50 J
Further fall of 20J means total fall of internal energy is 70 J
==========================
-
work done=50J
while cooling it loses=20J
internal energy CHANGE=50+20=70J
while cooling it loses=20J
internal energy CHANGE=50+20=70J