Name:
Lab 201: Electric Field by Point Charges
Section: 121A-H02
Date: February 8, 2012

Objective:
To compute electric field and corresponding field lines caused by point charges using MATLAB.

Theoretical Background:
-electrons are negative, protons are positive
-magnitude of force between A and B is:
, is 8.98755E9.
-electric field is the region around a charged object
-strength of electric field:
=
-electric field lines are used to visually show the field

Procedure:
Our procedure for this lab was very simple. We had to determine a correct MATLAB code to write. We inputted a code into MATLAB and received figure 1.1, the pot of the electric filed of a positive point charge. Our next goal was to plot the graph of the x position of a test charge in the presence of two positive charges versus the total electric filed at that point, we ended up with figure 1.2. We then repeated this plot, but with a positive and negative charge (figure 1.3). Lastly, we proceeded to plot the electric filed with two positive charges using a vector field plot (figure 1.4); and it was repeated for a positively and negatively charged particle in order to receive figure 1.5.

Results:

Figure 1.1

Figure 1.2

Figure 1.3

Figure 1.4

Figure 1.5

Part II

Procedure:
This was just copying code directly from the lab manual and seeing the results of the electric fields for various charged particles.

Data:

Part One Code:

clear all
esp0 = 8.85e-12;
k = 1/(4*pi*esp0);
q1 = 1e-9; %First Charge
q2 = -1e-9; %Second Charge
a = 1;
x = -2.1:0.1:2.1;
E1 = q1*k*(x+a)./abs(x+a).^3;
E2 = q2*k*(x-a)./abs(x-a).^3;
Etotal = E1 + E2;
plot(x, Etotal)
xlabel 'x'; ylabel 'Etotal';
grid on
title 'Total Electric field vs. x';

...
Centro de investigación y desarrollo de educación bilingüe (CIDEB)
PhysicsLAB REPORT
Uniform Rectilinear Motion
Teacher: Patrick Morris
Alejandra Castillejos Longoria
Group: 205
ID: 1663878
Abstract
The purpose of this experiment, was to prove the concept of the uniform linear motion by using an air track. With this, we demonstrated the impulse and change in momentum, the conservation of energy and the linear motion. We basically learnt to calculate the distance/time, acceleration/time, and velocity/time and graph it. The air track is also used to study collisions, both elastic and inelastic. Since there is very little energy lost through friction it is easy to demonstrate how momentum is conserved before and after a collision. According to the result, the velocity of the object in the air track was constant, it means that it didn’t have acceleration because it has constant velocity.
Introduction
First of all; we should understand what is linear motion. Linear motion is motion along a straight line, and can therefore be described mathematically using only one spatial dimension. Uniform linear motion with constant velocity or zero acceleration. The Air Track can be used to obtain an accurate investigation of the laws of motion. A car or glider travels on a cushion of air provided which reduces friction. Since the friction is all but removed the car will be moving at...

...Dalton Leach
Physics2lab chapter 21
6/26/2015
Procedure Part I Wire Resistance:
As wire length (cm) increases, the resistance (Ω) increases
As wire area (cm2) increases, the resistance (Ω) decreases
As wire resistivity (Ωcm) increases, the resistance (Ω) increases
Procedure Part II: Ohm’s Law: Electricity, Magnets, and Circuits Ohm’s Law
mA is milliamps, and 1000 milliamps equals one Ampere.
Move the potential (volts) and resistance (ohms) sliders and observe the current (amps)
As voltage increases, current increases.
As resistance increases, current decreases.
Fill out the tables below and check your work in the simulation. ( ½ pt each )
Remember, the simulation shows milliamps.
You should show Amperes
V = I * R
8.0 V
0.01 A
800 Ω
2.0 V
.044 A
450 Ω
2.5 V
.0058 A
430 Ω
6.9 V
.069 A
100 Ω
6.4 V
0.021 A
300 Ω
Conclusion Questions: ( ½ pt each)
1. Incandescent light bulbs have a very thin filament that glows when hot. Thin filaments have very HIGH resistance.
2. The 12V battery in your car operates a 25 amp car stereo. What is the resistance of this stereo system? 0.48 ohms
3. A “2D” Maglite flashlight runs on 3.0V. What is the current through the bulb if resistance is 15 Ω ? 0.2 Amps
4. How many volts must an iPod charger provide to charge an iPOD using .85 Amps at 35 Ω? 29.75 volt
5. You need to buy a long extension cord to power a stereo at your spring break BBQ. You need...

...Name ___Anjad Itayem_______________ Blackbody Radiation Lab 11
Go to http://phet.colorado.edu/simulations/sims.php?sim=Blackbody_Spectrum
and click on Run Now.
1) In this lab, you will use the Blackbody Spectrum Simulation to investigate how the spectrum of electromagnetic radiation emitted by objects is affected by the object's temperature. In this simulation, you can input the temperature and observe the spectrum of the radiation emitted.
a) The temperature of stars in the universe varies with the type of star and the age of the star among other things. By looking at the shape of the spectrum of light emitted by a star, we can tell something about its average surface temperature.
i) If we observe a star's spectrum and find that the peak power occurs at the border between red and infrared light, what is the approximate surface temperature of the star? (in degrees C)
Using the Spectrum Simulator, I found that this border is in the neighborhood of 4045 Kelvin, which converts to approximately 3772o C
ii) If we observe a stars spectrum and find that the peak power occurs at the border between blue and ultraviolet light, what is the surface temperature of the star? (in degrees C)
Using the Spectrum Simulator, I found that this border is in the neighborhood of 7080 Kelvin, which converts to approximately 6807o C
b) Light bulbs operate at 2500 degrees C.
i) What is the wavelength at which the most power is...

...
PhysicsLab Report
How does the length of a string holding a pendulum affect its oscillation?
Method
1. You will need the following apparatus: a pendulum, a piece of string, a clamp, a clamp stand and a timer.
2. Measure out 20cm and attach the metal ball.
3. Establish an angle and let the ball swing for 10 oscillations, timing it and stopping at the 10th one.
4. Write down your results.
5. Repeat steps 2-4 another2 times so that your results are reliable.
6. Then change the length of the string 4 times, so that you get 5 different sets of results and for each time, repeat it 3 times.
DCP
Raw Data
Data Processing
Calculations:
To find the average of the time, I added all 3 values and then divided by three. For example:
(0.89+0.83+0.89)/3 = 0.87
I calculated the absolute uncertainty by considering the furthest point from the mean. For example:
1.31 (mean) – 1.25 (furthest point from the mean) = 0.06
Therefore my absolute uncertainty is +/- 0.06
I calculated the percentage uncertainty by dividing the absolute uncertainty by the mean and multiplying it by 100, like this:
(0.03/1.70) x100 = 0.18%
Source of uncertainties:
The uncertainties in the measurement came primarily from the equipment. Since we used a ruler that was divided into parts of 0.1cm, the readings were normally rounded up or down. The length of...

...(kg) 0.2646 0.2646 0.2646 0.2646
Mass of cart 2 (kg) 0.2646 0.51678 0.26523 0.51678
Initial velocity of cart 1 (m/s) 0.303 +/- 2.9e-4 0.293 +/- 2.2e-4 0.292 +/- 3.7e-4 0.346 +/- 2.1e-4
Initial velocity of cart 2 (m/s) 0 0 0 0
Final velocity of cart 1 (m/s) 0.143 +/- 4.6e-4 0.0890 +/- 4.4e-4 0.227 +/- 3.1e-4 0.160 +/- 3.0e-4
Final velocity of cart 2 (m/s) 1.34 +/- 4.0e-4 0.0756 +/- 5.2 e-4 0 0
pi Δ p KEi Δ KE
Inelastic collision
m1=m2 0.08 -0.007 0.012 -0.007
Inelastic collision
m1 ≠m2 0.078 -0.015 0.011 -0.009
Elastic collision
m1=m2 0.077 -0.017 0.011 -0.004
Elastic collision
m1 < m2 0.092 -0.009 0.016 -0.009
Data Analysis
1. Momentum of cart 1 before collision
• p1i=m1*v1i
2. Momentum of cart 2 before collision
• p2i=m2*v2i
3. Momentum of the system before collision
• pi=p1i + p2i
4. Momentum of cart 1 after collision
• p1f=m1*v1f
5. Momentum of cart 2 after collision
• p2f=m2*v2f
6. Momentum of system after collision
• pf =p1f + p2f
7. Relative Change in total momentum of system
• pf- pi
8. Kinetic energy of cart 1 before the collision- KE1i
• KE1i=(1/2)*(m1)*( v1i)2
9. Kinetic energy of cart 2 before the collision- KE2i
• KE2i=(1/2)*(m2)*( v2i)2
10. Kinetic energy of system before the collision- KEi
• KE1i + KE2i
11. Kinetic energy of cart 1 after the collision- KE1f...

... 9/16/14
Physics 01L
Density
Abstract
This experiment was conducted in order to determine the density of the Aluminum metal samples provided in the lab. Specific tools such as the vernier caliper and balance scale were used to measure and record the values found. Given that density is a measurement of mass over volume, both of these quantities would have to be determined experimentally, prior to proceeding with the calculation of the density, for each of the six subjects tested. Being as accurate and precise as possible, the data yielded a density that was similar to that of the accepted value for the density of aluminum. Taking averages of the measurements recorded by both partners may have introduced a variable for error. However, upon calculating the percent error of the results found, it was concluded that there was less than a three percent error, which supported the accuracy and credibility of the experiment.
Data
Table 1: Tabular Presentation
Aluminum
Diameter D1 (cm)
Diameter
D2 (cm)
Average
Diameter (cm)
Height
H1 (cm)
Height
H2 (cm)
Average Height (cm)
Mass (g)
Volume
(cm3)
1
1.27 cm
1.27 cm
1.27 cm
1.55 cm
1.548 cm
1.549 cm
5.6 g
V=1.96cm3
2
1.26 cm
1.266 cm
1.263 cm
2.64 cm
2.64 cm
2.64 cm
9.6 g
V=3.31 cm3
3
1.26 cm
1.266 cm
1.263 cm
4.726 cm
4.728 cm
4.727 cm
16.6 g
V=5.92 cm3
4
1.26 cm
1.268 cm
1.264 cm
6.218 cm
6.216 cm
6.217 cm
21.8 g...

...Relative Density
Laboratory Report
Marella Dela Cruz, Janrho Dellosa, Arran Enriquez,
Alyssa Estrella, Zacharie Fuentes
Department of Math and Physics
College of Science, University of Santo Tomas
España, Manila Philippines
Abstract
The experiment was conducted to show the different methods on how to determine an object’s composition through its density and to determine an object’s density by displacement method and the Archimedes Principle. Results show that. The materials used were the spring scale, beaker, 25 pieces of new 25 centavo coins, a bone from a pig’s leg, diet and regular soft drinks, and a pycnometer.
1. Introduction
Density is a physical property of matter. It is the mass per unit volume of a substance. In this experiment, relative density is also used to be able to determine the composition of the substances or objects used. Relative density is the ratio of a density of a substance to that of the density of a given reference material. It is also known as specific gravity. Density is used when making or building objects that are required to float such as ships on water and airplanes in the sky.
Objectives:
1. To determine the density of an object by displacement method
2. To determine the composition of a substance based on its density
3. To determine the density of a substance by Archimedes Principle
2. Theory
Relative Density (R.D.) or also known as Specific gravity (S.G.), is the raito of...

...Chapter 2 Quiz lab
1. What mineral composition is most characteristic of felsic rocks?
a. olivine, pyroxene, and calcium-rich plagioclase
b. orthoclase, quartz, and biotite
c. calcium-rich plagioclase and hornblende with some olivine
d. particles of volcanic ash welded together
2. What mineral composition is most characteristic of mafic rocks?
a. olivine, pyroxene, and calcium-rich plagioclase
b. orthoclase, quartz, and biotite
c. sodium-rich plagioclase, hornblende, and quartz
d. particles of volcanic ash welded together
3. What mineral composition is most characteristic of intermediate rocks?
a. olivine, pyroxene, and calcium-rich plagioclase
b. orthoclase, quartz, and biotite
c. sodium-rich plagioclase and hornblende with some quartz or biotite
d. particles of volcanic ash welded together
4. When mafic lava breaks through fissures in the continental crust, which of the following often results?
a. lava plateaus
b. composite volcanoes
c. lava domes
d. pyroclastic sheets
5. Which scenario is associated with mafic magma?
a. hot, fluid lava that forms a shield volcano
b. hot, fluid lava that forms a stratovolcano
c. an explosive eruption that ejects pyroclastic materials
d. cool, viscous magma that forms a shield volcano
6. Which scenario is associated with felsic magma?
a. hot, fluid lava that forms a shield volcano
b. basaltic lava that forms a stratovolcano
c. an explosive eruption that ejects pyroclastic materials
d. cool,...