Q. 125.0( 1 Vote )

When we heat an object, it expands. Is work done by the object is this process? Is heat given to the object equal to the increase in its internal energy?

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.


Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
JEE Advanced Level Questions of NLM48 mins
Work done in Thermodynamic ProcessFREE Class
Microsporogenesis & Megasporogenesis49 mins
NEET 2021 | Transcription - An important Topic62 mins
Meselson and Stahl experiment49 mins
DNA Fingerprinting42 mins
Interactive Quiz on Molecular basis of Inheritance-02FREE Class
MCQs of Ecology for NEET52 mins
Medelian disorder series: Thalassemia, Sickle cell anaemia & Phenylketonuria60 mins
Different high order thinking questions based on DNA structure39 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
view all courses
RELATED QUESTIONS :