Question

5) A system absorb 640J heat and does work of 260J, the change in
internal energy of the system will be
a) +380J
b)-380J c) +900J d)-900J​

Answer 1

Explanation:

The system absorbs 640 J and the work system does on surroundings is 260J. Therefore by the first law of thermodynamics, the internal energy of the system increases by:

△U=q−W=(640−260)=+380 J.

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Answer 2

Explanation:

+380 Joule

First law of thermodynamics

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