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State the first law of thermodynamics....

State the first law of thermodynamics.

A

`DeltaU = Deltaq - W`

B

`q = DeltaU - W`

C

`qd +dW = 0`

D

`DeltaU q +W`

Text Solution

AI Generated Solution

**Step-by-Step Solution:** 1. **Understanding the First Law of Thermodynamics**: The first law of thermodynamics is a principle that relates to the conservation of energy. It states that energy cannot be created or destroyed, only transformed from one form to another. 2. **Expression of the Law**: The first law can be mathematically expressed as: \[ \Delta U = Q - W \] ...
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Knowledge Check

  • According to the first law of thermodynamics, DeltaU=q+w . In special cases the statement can be expressed in different ways. Which of the following is not a correct expression ?

    A
    At constant temperature, `q=-w`
    B
    When no work is done , `DeltaU=q`
    C
    In gaseous system , `DeltaU=q+PDeltaV`
    D
    When work is done by the system : `DeltaU=q+w`

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