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First law of thermo dynamics

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By Expert Faculty of Sri Chaitanya
Question

A system absorbs 200 J of heat and  700 J of work is done by the system. Change in internal energy for the process is 

Easy
Solution

 Heat absorbed by system = +ve

Work done on the surrounding

(or) 

Work done by the system = -ve

ΔU=+200700J

ΔU=500J


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