Q. 125.0( 1 Vote )
When we heat an o
Answer :
1. We know that,
Work done = force ×displacement
Volume = area ×displacement
Therefore,
Work done=pressure ×volume
Let change in the volume of object = ΔV = V2-V1
Pressure =P
Thus, work done by the object W
W=PΔV
During expansion volume increases. Hence work done will be positive and equals PΔV.
2. According to First law of thermodynamics,
ΔQ=ΔU+ΔW
Where ΔQ=heat supplied to the system
ΔU=change in internal energy
ΔW=work done by the system
Since work done by the gas is not zero, heat supplied to the object will not be equal to internal energy only.
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