What is Lab: Definition and 1000 Discussions

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...

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...

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...

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...

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.

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...

[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...

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...

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...

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...

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...

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...

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...

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...

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...

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

#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...

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)...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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

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...

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...

Homework Statement Useing atwood machine, determine acceleration, knowing weight of mass to be pulled and mass pulling, distance mass travels, and information provided by photogate[which we don't understand what exactly this information is] Homework Equations Unknown... The Attempt at a...

we were doing a lab to test archimedes's principle and it said to measure the specific gravity of a sphere using a jolly balance.. however, i fail to see how this is related to archimedes's principle since the jolly balance doesn't measure the displacement of the water or its weight..? what...

Homework Statement Hello. I recently did a lab with my chemistry class in which we mixed Potassium Iodide and Lead(II) Nitrate of different dilutions. We started off with 10mL of each solution and mixed them, giving us a final volume of 20mL. We then gradually decreased each solution's volume...