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UO / Physics / PHYS 202 / How do you explain conservation of energy?

How do you explain conservation of energy?

How do you explain conservation of energy?

Description

School: University of Oregon
Department: Physics
Course: General Physics
Professor: Jenkins t
Term: Fall 2015
Tags: Physics, Thermal Matter, and Thermodynamics
Cost: 50
Name: Physics 202 Study Guide for Midterm 1
Description: These notes cover a summary of the notes we went over in class, including equations and other useful information
Uploaded: 01/08/2016
7 Pages 27 Views 1 Unlocks
Reviews


Energy in ipos


How do you explain conservation of energy?



Energy out neg WORK on systems ous.

work by systemineg * If heat is transferred from enviro to a system, what happens to the thermal energy

Increases if no work is done on the system If work is done by the sus can increase, decrease

OR stay the same Absolute Temp: Coldest possible temp, temp @ which Volume of Ideal 903=0 and where pressure=0.


What does thermal energy depend on?



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Any

ana

ing pt: 1000c, 273K

pt

100°C, 373K

both depend on

pressure

DU

Thermal Equilibrium: no energy is transferred casheat and two objects are at the same temp Oo Lwill only have same energy if identical systems Brod law of Thermodynamics


What is absolute zero and absolute temperature?



We also discuss several other topics like What is it called when you have multiple partners in a relationship?

Ly entropy increases as you go from solid liquido gas ZeRoth law of thermodynamics

4 if A=B and B=C Then A=e Heat flows from not to cold Heat Engines -transform thermal energy from a hot Resorvoir to a cold Resorvoir -operates in cycle so change in thermal energy is Zero

studou

EW

Wout Qu-Qal

Stay Sour

Sto

Heat Engine efficienu:

t = Wout = QH - Qc = 11-Qe We also discuss several other topics like How many ribs do you have altogether in your chest area?

- Cannut be 100% Max efficiency: use temp?

T-TC n celyn

Stus

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Heat Pumps - Reverse of heat engine - found in Refigerators + air conditioners Don't forget about the age old question of Do multicellular bacteria exist?

QH = Win + Qc a Win=QH-Qc

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- has a coefficient of performance

what you get What you had to

whpalj

For heating: SCOP = QH = QH

- Win

QH-Qc

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COPmax= TH

For Corlingo copero de opt ac

CUPmax=

1

To TH

Te

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Violates heat flow ifs,

a heat flows from cold to hoh b. same heat engine is loos efficient If you want to learn more check out What does semiotic analysis mean?

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Entropy -measure of disorder in the susten. -irreversibles Regukes LDIR po Cerven to uoginal state

I a. energy transforemation to thermal energy if it requires usreke, it is irreversibles in an isolated system, entropy never decreases

Swill either incidide to equilib or stay same Pressure - force exerted on a Sueface dunded by area of the Surface Don't forget about the age old question of What kind of acid is acetic acid?

- 1 atm= 1.013 x 105 Pa We also discuss several other topics like What is the meaning of the general structure of government?

tot

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Ideal Gas law PV=NRT n=mores

R:8.314J/molik

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Average translational kinetic

by karang = 2 kg T Average speed: Vems: 3KST Aless massive molecules hove higher Veys then Massive ones

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SOU

( S

The Gas Laws 1. AS Volume time between collisions , so

force and pressure a 2. As temp & molecules more faster & Strike wallows

more force so pressure 3. More molecules means more frequent collisions

t greater average force and pressure 4. If molecules move faster to keep pressure same must be more time between collisions

so volume ť

Stady So

Thermal energy of Ideal gases - Eth= 7 PV = 3/2nRT

PV diagram

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area under curve is work done by I the system

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-if V increases work is positive - If y decieases, work is negative constant pressure: isobari

bwork done by system equals pressure timasA V Waas= PAV-area under curve

A&h= QtW=Q-PAV so

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a work

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SEUN SOUT

constant Volume: Sechura

by no work done ДЕw = (a

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Constant temp: isothermal

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A&th=0

- higher I

lower T

stus

SO

Adi bate process -no heat flow in or out of system

Q=0 So 1&h=W it work is done on system, Aeth

if work is done by system, Ant

Expansion: Eth and TV Compression : AEth1 and T Î Phave changer

Energy added during change of State ques into -breakina bonds between monewies So next phase

can occur -PE changes but ke stays same

d Sour

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Heat of transpremation : Q=ML!

Sused in cooling + y vapuranin

a heat of Vaporizohon Rises as temp decreases

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