{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

PHYS 122 midterm 2 study guide

# PHYS 122 midterm 2 study guide - Phys 122 College physics...

This preview shows pages 1–3. Sign up to view the full content.

Phys 122 College physics Midterm 2 Review ! II. Thermodynamics C. Laws of Thermodynamics 1. Systems, states, and processes a. System : quantity of matter enclosed by boundaries or surfaces (real or imaginary; described using macroscopic properties ( T , p , V ) Heat reservoir : a large separate system with unlimited heat capacity; the heat entering or leaving a system comes from or goes to a heat reservoir b. State : specific combination of variables ( T , p , V ) Equation of state : an equation relating the state variables; describes the system c. Process : a change in the system or state variables (heating/cooling) 2. Zeroth Law : Given three objects at temperature T 1 , T 2 , and T 3 , if T 1 = T 2 and T 2 = T 3 , then T 1 = T 3 . 3. First Law : states conservation of energy W U Q + = Be careful here with the signs. If heat enters the system, the temperature increases, hence U is positive. If the system does work, W is positive. If heat leaves the system, the temperature decreases, so U is negative. If work is done on the system, W is negative. The work done equals the area under the curve in a pV diagram. 4. Processes for an ideal gas a. Isothermal process : process happens at constant temperature; therefore, U = 0. From the first law, we then have Q = W . In a pV diagram: Work in an isothermal process is given by = 1 2 ln V V nRT W isotherm . b. Isobaric process : process occurs at constant pressure In a pV diagram: ! Note that the last page contains a list of symbols used and what they mean. Only the equations and constants will be given on the midterm. Please refer to the handout on Thermodynamic Processes. M. Ouellette, 9 November 2006 Page 1 of 6 p V 1 2

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Work in an isobaric process is given by V p W = isobaric . c. Isometric process : process takes place at a constant volume: V = 0; therefore, from the first law we have Q = U . In a pV diagram: No work is done in an isometric process since there is no area under the curve.
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern