# PHY2049 L

https://www.geogebra.org/m/JBhbf6Ke

### Credits:Physics Laboratory experiments : J. Wilson, C. Hernandez

http://www.lon-capa.org/~mmp/

SERWAY COLLEGE PHYSICS 7E MEDIA LIBRARY

Luciano Troilo, inetractive applet in italian

### Objectives I

- To describe thermal expansion and its applications

- To investigate the proportionality relationship between length, L and Temperature, T
- How changes in temperature influence/determine changes in an object's length

### Safety precautions

- Be careful when handling the copper/aluminum rods ; they are very HOT

### Procedure I:

Watch this video to learn how to use the interactive animation and gather experimental data; Use this interactive animation link; Credits, Author: Luciano Troilo

- Turn Heat On
- Click on the
**Read Temp button****5****times, when the change in length indicator reaches approximately,**

**10,****20,****30,40,****50****micrometers...** **Record the change in length from the analog dial (arc of the circle);**

**The reading is in****μm;****Record the****T, temperature; it's shown in degrees Celsius;****Use the****graphing script link****and plot the changes,****ΔL,****ΔT****such that the slope of the graphs represents****αexpansion.****Identify the material, the rod is made of, by using this****link****and searching for a material that has****αexpansion=slopefrom graph**

**Theory**

**The relationship between****ΔT****and****ΔL:**

**1)** ** : ** **ΔL=α⋅Linitial⋅ΔT** **→**

**Consider the initial length of the rod inside the device/sleeve**

**Linitial=** **7.8** **cm**

**The slope-intercept form for the equation of a straight line is**

**2)** ** : ** **y=** **mx** **+b**

**Comparing it with the equation** **1** **above** **→:**

**ΔL****is the variable on the y-axis expressed in****m****Linitial⋅ΔT****is the variable on the x-axis expressed in units of****m⋅0C****α, the linear expansion coefficient is the slope of the line,****m;****b, the y-intercept****=0.**

**Graphing - vizualizing** **ΔT,** **ΔL** **relationship**

**Plot a graph using****this link****!**

**Plot the Fahrenheit temperature on the****y****axis and the Celsius temperature scale on the****x****axis.**

**The slope will be automatically calculated;**

**Add units for the slopeUpload the graph and the answers to the questions as a jpg file! The upload link is on the interactive graphing page.**

https://www.youtube.com/watch?v=IN0c3uMG02U&feature=youtu.be

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