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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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Knowledge Check

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

    A
    Increases by 600 J
    B
    Decreases by 800
    C
    Increases by 800 J
    D
    Decreases by 5j

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    60
    B
    40
    C
    50
    D
    10

  • A system is provided 50 J of heat and work can be done on the system is 10 J. The change in internal energy during the process is:

    A
    40 J
    B
    60 J
    C
    80 J
    D
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