PHYS 2210, Chapter 21, Lecture 1
PHYS 2210, Chapter 21, Lecture 1 PHYS 2210
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This 6 page Class Notes was uploaded by Jasmine Cohen on Tuesday August 30, 2016. The Class Notes belongs to PHYS 2210 at Clemson University taught by Jason Stratford Brown in Fall 2016. Since its upload, it has received 14 views. For similar materials see Physics with Calculus II in Physics at Clemson University.
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Date Created: 08/30/16
8/29/2016 Chapter 21 – Lecture 1 – PHYS Notes Δ E = Q + W 1 Law of th TOT Thermodynamics ____________________________________________________________ - WTOT= work done “on” ideal gas - Compress Gas - W TOT> 0, positive - Expand Gas - W TOT< 0, negative ____________________________________________________________ Top Hat Question #1 An ideal gas in a cylinder pushes a piston upward, what is the sign of the work done on the gas W for this process? TOT Based on the information above, the sign would be negative. ____________________________________________________________ Integral Method 8/29/2016 ____________________________________________________________ The Area Method ____________________________________________________________ Calculate Both Ways Integral Method 8/29/2016 Area Method ____________________________________________________________ Top Hat Question #2 What is the work done ON the gas for the process on the Pressure - Volume diagram? W TOT= Area Under Curve W TOT= ½ (5 m ) (2 Pa) W TOT= - (½ ) (5 m ) (2 Pa) = -5 J (Negative b/c it’s expanding) ____________________________________________________________ 8/29/2016 Cycle on PV Diagram - W TOT work done “on” ideal gas In general, work done on gas per cycle = + Area of Shape ____________________________________________________________ Top Hat Question #3 What is the work done ON the gas in one cycle? W TOT= + Area of Shape Area = l * wDirection = CCW W TOT + l * w W = ( V – V ) ( P – TOT 2 1 2 P1) 8/29/2016 ____________________________________________________________ Review for the 3 Processes Learned Isothermal Work Isochoric Work Isobaric Work ____________________________________________________________ *** PRIMARY FOCUS OF CHAPTER 22 *** 8/29/2016 - W = work done “by” the gas - Compress Gas - W TOT< 0, negative - Expand Gas - W TOT> 0, positive
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