Lab Definition and 1000 Threads

1. Hey! i have done a physics lab on cantilevers, and what i did 1. Hey! i have done a physics lab on cantilevers, and what i did was i varied the length of the leaver while keeping the force applied constant and measured the displacement down of the leaver. However, i am not sure what to graph...

I finally got a decent color camera for my lab, and would like to share some images here. I can't find any forum guidelines for the images- specifically, what's the allowed filesize?

Chemistry Lab equations :( 1. Homework Statement [/b] Here is the question: -A solution was prepared by dissolving 0.46 kg of ethylene glycol (C2H6O2) in 2.46 kg of water. A.) calculate the molal solution B.) calculate the expected freezing point of the solution Homework Equations...

The theme seems to be that Academia positions are far and few between, so it that the same for National Labs too? Thanks.

I need to buy a lab coat for someone but I want to have our university and some other logos embroidered onto it. Does anyone know of a place where I can have this done and have it done fast? I've emailed a couple places I found online but haven't received any responses.:frown: I'm thinking it...

Homework Statement Hi guys. So i have to write a lab report on a lab we did on photosynthetic pigments. Just to give you some background, we extracted pigments from spinach leaves by first boiling them in water and then putting them in ethyl alcohol. Then we used chromatogrpahy paper to...

Do any of these five objects move in similar ways? Which ones? What do they have in common? -Oscillating pendulum -dynamics cart rolling up and down an incline -student jumping into the air -mass oscillating at the end of a spring -ball tossed into the air My guess would be that...

Should undergraduate physics lab courses be available in an online ("Web-only") format? How? What are the Pros? Cons? Please discuss. If you teach physics, please also answer a very brief (7 questions, 5 minutes) research survey on your institution's use of online content for physics...

a teacher wants to see if the lab helps the student perform better. He took two independent samples, 77 students who attended the lab and 23 who didnt attend the lab. 6 out of 77 that attended the lab said that they had difficulties, 16 out of 23 that didnt attend the lab said that had...

Homework Statement Need to calculate the error of coefficient of static friction in a lab where: µs = tan(theta)s They say to use the general theory of errors? Homework Equations delta[tan(theta)] = [1/cos(theta)]^2 (delta)(theta) The Attempt at a Solution Do I just plug in my...

Homework Statement Its the end of the year in my AP chemistry class and one section of our lab final includes finding the molar mass of an unknown gas. we are given a balloon filled with the gas and we must conduct any tests to figure the molar mass outHomework Equations pv=nrt i believe the...

Homework Statement I did a lab with the Atwood's machine...very simple, just measuring acceleration differences with different masses. In my lab report I need to answer this question though: given the formula (m1-m2)g=(m1+m2+I/R2)a, knowing that (m1-m2)g is given as the y-variable and "a"...

gravitation lab for online simulation--equation derivation help? Homework Statement To start with, you can access the lab here: http://phet.colorado.edu/teacher_ideas/view-contribution.php?contribution_id=690" . I'm having trouble with the "Activity 4" part. It reads: "Change the number of...

Homework Statement I did a lab in physics where we used a ballistic pendulum. Basically we had to derive equations for the initial speed of the ball for the pendulum and as a projectile using energy/momentum and kinematics. I was just wondering what are some good sources of error for...

I am having a problem with my kinetics lab. There are just three questions I can not understand. 1. Determine the order with respect to HCl. Explain. 2. Determine the order with respect to Sodium Thiosulfate. Explain. 3. Why rate values for this experiment not adequate to achieve an accurate...

i have to have my lab report ready in the next 1 hour and i am stuck. in my experiment we had a varied power supply , an ammeter and a voltmetter both with small error (and digital). i have taken about 15 measurements of potential difference and its respective current. the circuit had in one...

Homework Statement i have to have my lab report ready in the next 1 hour and i am stuck. in my experiment we had a varied power supply , an ammeter and a voltmetter both with small error (and digital). i have taken about 15 measurements of potential difference and its respective current. the...

Homework Statement "Use your experimental data to calculate the formula for hydrated MgSO4" Homework Equations i used 2.25g x 1 mole/141.46 = 0.016 moles The Attempt at a Solution i'm not sure how to calculate the formula. how do i do that? is there a different equation involved...

Hello, I'm designing an experiment that requires a short pulse of electricity at voltages above and beyond 10,000,000 volts at about 300A. I'm having a hard time finding devices that can produce that high of a voltage and current without breaking down, much less finding a way to store that much...

I'm conducting a lab in which I change the distance of a lamp from a solar panel and use a multimeter to measure the resulting voltage. What type of relationship am I supposed to find? My results seem to indicate either a relationship with either a quadratic equation as its model or an inverse...

In my physics class, we are reviewing trajectory, so we are setting up a lab where we shoot some form of a paper rocket across our gym with an air compressor, and hopefully hit a target. The paper is kinda thick, but we can add whatever we want onto it, if we make it think it will make it will...

In the lab, can the reaction form a mixture of aldehyde, carboxylic acid, and alcohol? What I mean is that could some of the aldehyde may not have reacted and be present in the product maybe because too much is used? Or is the reaction exclusively yields an alcohol and carboxylic in equal...

Homework Statement My graph doesn't look like a typical stress vs strain plot. http://dl.dropbox.com/u/2344149/graph.png * y-intercept set to zero and last 4 data points were ignored Wire diameter= 1.16 mm L0= 100.2 cm \overline{}L'0= 0.015 Young's modulus for steel (actual)=...

Homework Statement Heat of Reaction for the combustion of Magnesium Data: A. Mass MgO = 0.7975g Volume 1M HCl = 97.5 ml Temp.intial = 24.2 C Temp.final = 29.3 C \DeltaT = 5.1 C B. mass Mg 0.0896g Volume 1M HCl 89.5 ml Temp...

Homework Statement So we have recently done a reflection and refraction lab measuring both the angles of reflection, refraction as the angle of incidence was changed from 30-80. The last question on my lab report asks why the piece of plastic used must be semi-circular in nature. It also...

I did a lab today using this stuff. I need to learn how to find the wavelength of the 1st order of an unknown filament. My data is 600 lines/mm grating Purple line 15 degrees 30 minutes, 15.5 degrees using the equation of d sin (angle) = m (lambda) im supposed to get something like...

Homework Statement I did a lab which consisted of using the Bradford method and graphed the standard protein concentration and the absorbancies of BSA standard dilutions and used the slope in order to determine the protein concentrations of 3 unknown samples using their absorbance values. When...

ok, i did a lab and found values of the diameter of the electron rings after diffraction from a graphite. i also have the voltage that i accelerate the electrons to hit the graphite. so to find the distance between adjacent planes of graphite carbon "d", we use bragg's diffraction law right...

Homework Statement I heated 50mL of water in a Dewar and measured the temp. change with time. however, this only gives me the heat capacity of the system. I again measured but with 100mL of water, in an attempt to correct for the unknown heat capacity of everything but the water. However...

Homework Statement a magnet that weighs 2.6 grams is dropped through a 1.53 metre tube. the average time taken for it to go through is 1.59 seconds. I need to find the strength of the magnetic field and the currentHomework Equations Fg=mg B=F/IlsinthetaThe Attempt at a Solution...

Homework Statement Okay, so in my Physics 2(high school) class the instructor gave us a lab without any instructions whatsoever even though we have only been covering electricity for 2 days. The question he posed to us was "What factors affect a battery's performance?" and we have to write up...

So, I am going to be graduating with a BS in physics next spring and I am unsure about what to to about grad school. I think I would like to work on renewable energy at a national lab or in an upcoming industrial company. I was thinking about going somewhere with an applied or engineering...

calculating percent error in a lab please help! Homework Statement I have to calculate an experimental value for g using values from my lab. I got -45.9 as my value, and now i have to calculate the percent error Homework Equations a= g (m2 - m1/ m2+m1) was the equation i used...

Hey all, I'm a little confused and just wondered if you could help me out with some chaos theory (don't worry, this isn't homework!). My lab partner and I (second-year undergrads) have been doing an experiment in the lab on chaos theory for an extended project and we started off with an LCR...

i have to say physics kicks my butt. i never worked so hard in my life to earn a D in a class. now, i have to take the lab for that course and they are trying to kill us! the TA tore up my lab partners work because he didn't like the way she presented it in her lab book! ok, so that is what i am...

Homework Statement Chem lab on equilibrium. We added the same amount of Fe(NO3)2 (5ml) to varying amounts of KSCN and used a given Beer's law and absorption data to calculate concentration of FeSCN2+ and then calculate the Eq. constant (K). I calculated the Eq. constant, but I'm stuck on...

Homework Statement I had to do a lab, the diagram of which is shown. The radius (r) of the string was 50.0 cm, and our first mass was 29.0 g. The time for 20 trials was 15.75 s. We repeated the process with five other masses and recorded all the same information. Then, we had to plot the...

Homework Statement Sorry about not using the template, but I didn't really see how I could have. If you guys/gals could please check over my answers to these questions and point out the ones I miss that would be outstanding. Thank you! 1. The position of an object moving on a coordinate...

Homework Statement I'm doing a physics lab and need to do the uncertainties, and the method I'm using is the natural log method, hich goes like this: (equation used was k*(x^a)*(y^b)*(z^c) ) http://img297.imageshack.us/img297/3663/lnform.jpg The equation I'm doing...

I am teaching 7th grade Science. We are doing the shoe drag lab. To start we drag a shoe across the floor with a rubber band. Then we add a rock to the shoe and drag it again, measuring the stretch of the rubber band with a ruler. My question is: by adding a rock to the shoe, are we adding...

hi, i'm a physics undergraduate at a local university in sri lanka. currently I'm arrying out a research in observing the stark effect.the problem is that i have not been able to find anything about the experimental setup of demonstrating the stark effect on the internet...can anybody give...

Hello All, I am in search for a company to buy lab supplies from and am looking for any recommendations. I need to buy tweezers, dishes and other supplies. I work in a clean room mostly with small 1cm x 1cm chips, sometimes with full wafers. I did some google searches only to be...

Homework Statement Hi! Okay so I have a question about the calculations for an equilibrium lab I completed. I have the equation Fe3+ + SCN1- makes FeSCN2+ I know that Fe3+ equals 2.25x10 to the -5 power M and SCN1- equals 0.50 M. . The attempt at a solution Would I simply add the 2...

Homework Statement okay, so the lab that we did is called fluid dynamics. where we open a hole but before we are supposed to record h1 before the hole is open and also measure the height of the hole. h1 is higher than h. so every 30 seconds, we have to record h2, h3 ,h4 corresonding with...

Im doing my chemistry lab and ran into trouble with this problem. I am not even where to start or what formulas to use. Any ideas? Thanks. Suppose that a student calculated Kf of biphenyl to be 81.2 C kg/mol. Calculate the molar mass of an unknown if a solution containing 1.64g of an...

Hi I want to buy a scientific lab temperature controller with inputs for J-type thermocouple and consists of a standard circuitry of a solid state relay,controller,switch - all enclosed and pre-wired in an enclosure(plastic/metal). The purpose is not a hi-fi one so need one for a...

Homework Statement I am required to determine an average molarity for sodium hypochlorite solution, the experiment involved titrating 10 mL of 1:10 diluted bleach (sodium hypochlorite) with sodium thiosulfate, the volumes of titrant used to reach endpoint are, 17.95 mL, 18.31 mL and 18.21 mL...

Homework Statement Hey guys I need help with a lab I'm doing that is similar to the Milikan's experiment. I am given 10 bags each holding the same item (Jellybean) of various quantities. Each bag has a different mass. What I'm trying to figure out is the mass of the individual item, so mass...

Hello all this is my problem: Homework Statement I have to determine the concentration of a sodium thiosulfate solution used to titrate a potassium iodate solution. The only variable that is known is the concentration of the potassium iodate solution, 0.01 mol/L. There is 20 mL of 0.01 M...

Homework Statement Given that the uncertainty in the angular velocity is δω = 0.48 rad/s and the uncertainty in x is δx = 0.37 cm, calculate the uncertainty in y (δy) for the following points. The angular velocity of the bowl is 16.3 rad/s and you may ignore the uncertainty in H. I have...