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A system is provided with 200 cal of hea...

A system is provided with 200 cal of heat and the work done by the system on the surrounding is `40J`. Then its internal energy

A

increases by `600J`

B

decreases by `800J`

C

increases by `800J`

D

decreases by `50J`

Text Solution

Verified by Experts

The correct Answer is:
C
`DeltaQ = DeltaU+DeltaW`
`:' DeltaQ=200 cal. = 200xx4.2=840J` and
`DeltaW = 40J`
`implies DeltaU=DeltaQ-DeltaW=840-40 = 800J`.
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