Lab Definition and 1000 Threads

  1. J

    Interference of Waves Lab: Teach Grade 12 Physics

    Hi, I am a grade 12 physics student and as our final evaluation I must teach a section of our textbook to the class. The section I received was "Interference of Waves" and I must also create some kind of lab or demonstration for the class. My idea so far is to set up two speakers playing the...
  2. M

    Physics Lab - Measurement of Absolute Zero?

    This problem seems straightforward and easy enough, but I still want to check my answers. Suppose the pressure of the bulb (light bulb I'm guessing used in experiment) is 20 psi (absolute) at 20C. What would you predict the pressure to be at 0C? What would you predict would be at 100C? I...
  3. M

    Physics Lab - Mechanical equivalent of heat

    1.) Using the table provided what is the change in thermistor resistance if temperature rises from 21 C to 30C? The ohm values for resistance are 120810 for 21C and 79,422 for 30C. I just subtracted the two numbers and got -41,388 ohm. I hope that's right! 2.) This lab involves a spool...
  4. fluidistic

    Lab report questions, gas thermometer

    Hi PF! I have a lab report to do about a gas thermometer experience that I couldn't do. I'm very saddened about this because I should have manipulate mercury but the earlier group broke a container of mercury and so the class had to be disinfected and closed for some days. Basically it...
  5. D

    Simple Harmonic Motion Lab Question

    In physics class, we had to do a lab where a mass was attached vertically to a spring system. The spring went through simple harmonic motion. We stretched the mass and let go of it. We then used a software to determine the kinetic energy, the elastic potential energy, and the total energy. We...
  6. Z

    Help with lab - Speed of Sound in Air

    Help with lab - "Speed of Sound in Air" Homework Statement https://www.learningpoint.org/courses/1/C37230/content/_259415_1/Lab%20-%20Speed%20of%20Sound%20in%20Air_1.pdf?bsession=2880270&bsession_str=session_id=2880270,user_id_pk1=7284,user_id_sos_id_pk2=1,one_time_token= Problem #1...
  7. S

    Lab - Friction and Forces on an Incline

    Okay, so I am writing a lab but I am quite stuck on one question. Using the average force of sliding friction from the data, calculate the coefficient of sliding friction. Average force of sliding friction: 0.32N The equation I used to calculate other static/sliding coefficients was...
  8. wolram

    Longest continuous running lab experiment

    What is the longest continuous running experiment , By continuous i mean some equipment is set up and left to run, not some thing like CERN where there has been periods of down time.
  9. P

    Why is the current reading the same in each lamp in a parallel circuit?

    Hi, I wasn't sure I should post this here. We did a lab on series and parallel circuits and it went great until we got to the parallel circuit. The meters were connected in the correct way but for some reason, the current showed up on the meter as 12.8 (amps?) in each of the lamps. In...
  10. E

    Centripetal Acceleration lab question

    [b]1. This is more of a general question about a lab report I'm doing: The purpose of this lab is to find if the acceleration of a person sitting on the end of a steel beam is moving at a constant acceleration, if they aren’t accelerating, or if acceleration changes with time. I have all my...
  11. V

    Gravitational torque on a uniform beam: Cavendish experiment (LAB)

    This is my first post here. I'm a senior in Applied Physics at Tufts Univ. Trying to work through a lab report and can't get this part figured out. The lab is a replication of the Cavendish Experiment. The situation is as follows: there is an aluminum beam of known mass, width, and length...
  12. H

    Questions with uncertainties for lab reports

    Homework Statement I am unsure how to do uncertainties for my lab experiment. For example, we are suppose to estimate or guess the uncertainty for like the time and measurements.. Is there any general rule for proper guessing? Then I am unsure on what to do with the uncertainties in math...
  13. C

    Question about a bunsen burner lab?

    Okay, I have a lab write-up due tomorrow and I am completely stumped on one of my conclusion questions. The lab was an attempt to figure out the temperature of a bunsen burner flame. We did this by using a bunsen burner to heat copper and then immersing the copper into a cup of water and...
  14. B

    Pendulum lab relationship between straight-line equation and period equation?

    pendulum lab... relationship between straight-line equation and period equation? hello. i am really puzzled! on my pendulum lab i have to compare the period equation to the straight line equation, and i must know what part of the period equation represents x? y? and m(slope)? please help if...
  15. A

    Voltage and Current lab report help

    I'm working on a basic physics lab report (not homework) and I'm trying to understand something better. We're establishing a relation between voltage and current using Ohms law. It goes as follows: We apply different voltages to two materials and record the current in order to determine the...
  16. J

    Electric Circuit and Internal Resistance Lab

    Homework Statement I performed a lab where we designed an electric circuit on paper and then calculated the Current, Power, and Voltage for each of the resistors. We used one power supply. Then we built the circuit we designed and then measured the actual Current Power and Voltage for the it...
  17. X

    What is the total capacitance for the RC circuit lab problem with given data?

    Homework Statement I did the RC circuit lab I measure the actual resistance of 1000Ω Function Generator Resistance: 50 Ω Function Generator Frequency: 1.4Hz resistor used was 41uF in C1 Resistor used was 22uf for c2 So i have to find c1, c2 and use c1,c2 to calc. the total...
  18. Shackleford

    Mary's Puzzling Lab Experiment: Calculating the New Weight of a Mixture

    Mary was working in a chemistry lab with a mixture of chemicals that was 90% water and weighed 20 pounds. After returning to the lab from a weekend break, she calculated the mixture was now 50% water. How much does the mixture now weigh? For purposes of this puzzle, assume the non-water part of...
  19. Math Is Hard

    Lab Assistant Tragically Dies in Chemical Fire at UCLA

    Sad story: http://newsroom.ucla.edu/portal/ucla/lab-assistant-dies-of-injuries-78543.aspx
  20. A

    How Do You Calculate Moles of Gas and CO2 Concentration Using the Ideal Gas Law?

    #1-Use the Ideal Gas Law to calculate the number of moles of gas at 1.00atm in a cell 10.0cm long having a cross sectional area of 1.00cm^2 at 298K. (1ml=1cm^3) #2-Lets say you start with 6.0 x 10^2 mL of 1.0 x 10^-4 M NaOH solution containing phenolphthalein indicator. The equation is...
  21. R

    2002 AP Exam: Lab Situation w/Density and Springs

    In the laboratory, you are given a cylindrical beaker containing a fluid and you are asked to determine the density ρ of the fluid. You are to use a spring of negligible mass and unknown spring constant k attached to a stand. An irregularly shaped object of known mass m and density D(D>>ρ)...
  22. N

    Solving Reaction Rates in Lab Experiments

    Homework Statement okay so I am going to do a lab on reaction rates, there's a table given (effects of varying concentration) there are 9 reactions, I will just give one, ( if i can figure this out ill figure out the rest on my own) so reaction #1 flask A contains 7.50mL of .200M KI...
  23. N

    Synthesis of oxalate complexes, post lab question

    Homework Statement Okay I'm having trouble with my post lab question. This lab is on the synthesis of Iron(III) Oxalates. I have to figure out the theoretical yield, but i can't seem to even find a balanced equation. I've gone over this a million times but can't seem to figure it out...
  24. R

    1996 AP Exam Question: Lab Situation with spring

    A spring that can be assumed ideal hangs (vertically) from a stand. a. You wish to determine the spring constant k of the spring. i. What additional equipment do you need? ii. What measurements would you make? iii. How would k be determined from these measurements? b...
  25. P

    Cygwin, why does my lab recommend to NOT use it?

    I have been using cygwin since a long time now, but my system administrator recommend that we no longer have cygwin installed on the lab computers because it is "in bad shape". I have also seen this on ROOT's website. "http://root.cern.ch/root/Version522.html" " What is this poor state that...
  26. T

    How to set the threshold of a discriminator? (Lab)

    I'm doing a lab to find the lifetime of the muon. In calibrating the equipment I need to set the threshold voltage of the discriminator to limit noise from producing digital pulses. My writeup is terribly written and I can't find an explained procedure online. My prof also has little input on...
  27. R

    Organic Lab Acetanilide Crystallization

    Okay, so I'm having trouble with a question on a Pre-Lab assignment. The question is, "Acetanilide is more soluble in etyhl acetate than in hexane. Why? Draw the structures of etyl acetate and hexane in your explanation." So I know Acetandilide is polar, and hexane is a solvent for...
  28. W

    Physics Discussion Question On My Roller Coaster Lab (Energy-Related)?

    Homework Statement We did this roller coaster lab where we had a metal marble roll up and down this roller coaster track. One of the questions he asked us was "is energy "missing?" explain where it went." I know friction takes some of it, but I am not good at wording it right to sound...
  29. N

    Navigating Physics I Lab Reports: Principal Results & Sources of Uncertainty

    Hello there, it's my first semester in Physics I, so I'm not exactly sure which is which. If someone would clarify what these are, that would be wonderful. They're for our lab report. - Principal Results - Sources of Uncertainty (in order of importance) This is our first lab...
  30. L

    Jumping Lab Question ( Kinematics )

    Homework Statement a.Standing(Tip Toes) - 0.15m b.Crouching(As before you jump) - 0.35m c.At the height of a jump - 0.36m d.At the bottom of your landing - 0.67 Mass = 75kg 1. Find the initial velocity at "take off" ( remember to use magnitude and direction of your acceleration while you are...
  31. W

    Weekly Lab Sessions: Guide to Keeping a Good Lab Book

    Hi, Im on a university level physics course and we do weekly 4 hour sessions in the labs doing a different experiment every week. I don't have a specific question. I am asking if anyone has any guidence on keep a good lab book while doing the experiment? They have given us pointers...
  32. M

    Solving Kinetic Energy Lab in Online Physics Class

    I'm having some difficulty in an online class. Here is a screen shot for reference: Homework Statement : I'm doing a physics lab (screen shot is available above). The procedure says: The small object I'm using is a small pecan in it's shell. As you can see from the screen shot I have...
  33. A

    Verifying gravity from our lab.

    Homework Statement We had our lab yesterday in engineering physics where we had a car with nearly no friction descending down an incline plane. The incline was at 16 degrees, and we used data studio to record a crazy amount of trials at various distances. The point of this is to calculate...
  34. M

    Is the Graph of Lattice Spacing vs Inverse Square Root of Voltage Linear?

    Homework Statement I'm just making sure I have the correct parameters for a linear graph. The experiment used a diffraction tube to verify deBroglie's hypothesis. The goal is to find the correct lattice spacings in graphite for d(10) and d(11). This might be lacking in pertinent information...
  35. P

    Medical Question For A Medical Lab Tech

    Hello everyone. I have a very important question for a medical lab technician, or someone who is familiar with Gram Stain tests. I recently had this test done on a penile discharge swab through our local laboratory. I do realize that this test is used to determine the presents of bacteria...
  36. T

    Working in the Lab needed a break

    Ah.. been coding and waiting for plots for a couple hours. Time to chill for a bit... What to do?
  37. M

    Please help on this centripetal force lab

    ok so I am sure you all know about the lab where u have to find relation between Fc frequency,radius,mass,velocity with stoppers and such. so my final discussion question states: It should be noted that in this investigation the radius of rotation is only an approximation,particulary at lower...
  38. E

    Troubleshooting Centripetal Force Lab Calculations: What Went Wrong?

    Homework Statement Since I ran out of time in class, I have to make up my own times for this lab using calculations. The lab consists of our providing a little force by shaking this tube. Inside this tube is a string, and at one end of the string is attached a hanging mass, the other end a...
  39. P

    How Do You Analyze Forces and Motion in a Hot Wheels Lab Experiment?

    How would you find fnet if there is no force applied? does anything happen to the other forces as well? how do you find the theoretical and actual distances traveled up and down an incline if you have photogate data and need to find the theoretical and actual distance traveled? should i...
  40. V

    Teen with home chemistry lab mistakenly arrested for meth production

    http://blog.makezine.com/archive/2008/12/teen_with_home_chemistry_lab_mistak.html This is insane. Cops need to get the hell of their high horse. There was no investigation, no looking for evidence before an arrest. How did they get the search warrant? Do judges really believe that anyone...
  41. S

    Distillation Lab Recipe for Beginner Chemistry Students

    I am looking for a recipe for a good mixture for beginning chemistry students to separate by distillation. I have tried water/ethanol mixtures, but there is not a clear definition between the two. Also, I would like something more visual. I have heard rumors of a separation of dyes, but I...
  42. P

    Help with lab question(percent error)

    Homework Statement Lab on circular motion. The class swung a mass in a circular motion by a string. --Find percent error of the trail. Total mass=0.25kg radius=.448 meters period=.427 seconds Homework Equations I am not sure The Attempt at a Solution This is one of those...
  43. 3

    What colors do ions of various elements produce in a flame test?

    Homework Statement Checking the before and after of ions of various elements for the flame test. Homework Equations None really. The Attempt at a Solution I looked online for the elements but am not sure the data is correct/accurate enough. So far I have: Ion-Before-After...
  44. R

    Mass momentum of inertia in lab, error analysis

    Homework Statement Hi, I've a lab assingment, and the labwork must be planned beforehand, but I have some trouble figuring out some parts of my error analysis. So, I'm supposed to measure (as in not use integrals to find out) the mass momentum of a ball. The plan is to place the ball on an...
  45. M

    Capacitor Lab (Capacitor as source)

    Homework Statement http://img141.imageshack.us/img141/6173/capcircuitji2.jpg Basicly, I have to get charges and voltages as these switches are opened and closed on this capacitor circuit. First, Switch A closed, B open. (C1 is charged.) Then, switch A opens, and B closes. Vi=5v...
  46. C

    What are the shapes and hybridization of these 13 chemicals for my lab?

    Need help finishing my lab... I am having a hard time completing my lab. I was given 13 chemicals and have to draw the Lewis dot structure, there 3-D structures, Shape, Hybridization, bond angles, Polarity, and there Intermolecular forces. I was wondering if anyone could tell me the Shape...
  47. L

    Find G: Physics Lab Experiment w/ 50 g Masses & Stop-Clock

    1. I have a to do a lab this week myself, it's not an exam more of assessing if I can do it or not. Here's what I have; 1. a set of six calibrated 50 g masses, 2. a stand with scale graduated in cm, 3. a spring with attached holder for calibrated masses, 4. a stop-clock. I have to find G, the...
  48. P

    Find the Best Virtual Chem Lab for General Chemistry Labs - Try It Now!"

    Hey guys, does anyone have a strong link for a Virtual Chem Lab for General Chemistry labs? It can be online or downloadable. Thanks
  49. E

    How Do Intermolecular and Intramolecular Forces Compare in Paradichlorobenzene?

    Properties of Aggregates Lab Homework Statement Are the intermolecular forces or the intramolecular forces greater in paradichlorobenzene? Explain. Homework Equations N/A The Attempt at a Solution Confused about what 'intramolecular' forces are. --------------- Determination of...
  50. A

    Friction Lab Troubles: Finding Static & Kinetic Friction

    My problem is with this lab on friction...it is a virtual lab, as I attend a virtual high school. I've put in numerous hours and can't seem to figure out what is wrong. You see, we need to determine max static friction and kinetic friction using this program. For all the objects EXCEPT the dog...
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