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Understanding Internal Energy Changes in Gas During Heat and Work Interactions

This article explores the relationship between internal energy, heat, and work in gases, following the equation ΔU = Q + W. Through examples involving Frieda Peoples, Bob White, and Job Shadeau, we demonstrate how heat flow and work done result in changes in internal energy, leading to variations in temperature. Readers will learn how to calculate internal energy changes in different scenarios, and understand the implications on gas behavior regarding temperature rise or fall.

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Understanding Internal Energy Changes in Gas During Heat and Work Interactions

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  1. Work Heat Internal Energy Q = U + W Then And/Or The gas gets hotter (Temp Rises) (+U) The Gas does Work (piston moves out) (+W) If heat flows in (+Q) Frieda Peoples lets 45 J of heat flow into a gas that does 21 J of work. By how much does the internal energy change? Does the temp rise or fall? Bob White lets 54 J flow into the gas, and it does 67 J of work. By how much does the internal energy change? Does the temp rise or fall? Job Shadeau does 89 J of work on a gas by compressing it, and the internal energy increases by 52 J. What is the change in heat of the gas? What happens to the temperature? +24 J, rises -13 J, falls -37 J (heat flows out), gets hotter

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