Does Work Equal Total Work + Internal Energy Change?

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SUMMARY

The discussion centers on the relationship between total work, internal energy change, and heat flow in thermodynamics. It establishes that total work executed on a system is the sum of mechanical work and internal energy change, with the equation Q = ΔU - W illustrating this principle. Specifically, if the change in internal energy (ΔU) is one-third of the total work (W), then two-thirds of the work is lost as heat flow (Q). This highlights the importance of understanding energy transfer in thermodynamic systems.

PREREQUISITES
  • Understanding of the First Law of Thermodynamics
  • Familiarity with concepts of internal energy and heat flow
  • Basic knowledge of mechanical work in physical systems
  • Ability to manipulate thermodynamic equations
NEXT STEPS
  • Study the First Law of Thermodynamics in detail
  • Explore the concept of heat flow in closed systems
  • Learn about mechanical work and its calculations in physics
  • Investigate real-world applications of thermodynamic principles
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This discussion is beneficial for students of physics, engineers working with thermodynamic systems, and anyone interested in the principles of energy transfer and conservation in physical processes.

Anonymous119
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Ok, if it says that change of internal energy is part(for example 1/3) of TOTAL work executed over system(body). Does it mean that is TOTAL work indeed sums of every single work(mechanical work+internal energy change+...) ?
 
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Anonymous119 said:
Ok, if it says that change of internal energy is part(for example 1/3) of TOTAL work executed over system(body). Does it mean that is TOTAL work indeed sums of every single work(mechanical work+internal energy change+...) ?
It means that 2/3 of the work done on the system has escaped the system as heat flow.

From the first law:

Q = ΔU - W where W is the work done ON the system.

If ΔU = W/3 what is Q?

AM
 

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