Lab Definition and 1000 Threads

Homework Statement In our lab, we had springs of different tolerances hung off of a holder (I can't really describe it) by one end and dangled different masses on the other end. We had to put the data that we collected of displacement and force on a graph and find the linear best fit line...

Homework Statement Assuming that f=mu(N), show that the cofficient of (rolling) friction for the car moving down the inclined plane with a constant speed is given by mu=tan(theta) - m2/mc cos(theta)(Use symbols, not numbers.) Homework Equations The Attempt at a Solution Can...

I am doing a lab report for a lab I did in class. The lab is about sliding a mass (in this case a book) down an inclined plane. I collected the data and calculated the acceleration for the mass if it fall at 90 degrees. I have to do an analysis but I having some trouble answering these...

How "nice" is your lab? Does nice equipment and work space really matter? I go to a small school and I'm just curious as to how well equipped or nice everyone elses (academic) labs are, especially those of you that go to big top 10 schools. The labs at my school for the most part are relatively...

Homework Statement suppose a small amount lead (II) chloride got into your Ba(OH)2 sample before titration, contaminating it. how do you think the contamination would affect your calculated concentration for the sample? what about a small amount of FeCl3? Homework Equations The...

Homework Statement I need to predict how far a rocket will land given: Delta Y = 2.032 (80 in ) - Height it will be shot from. Angle - 35 (degrees) My Average velocity is 23.3 m/s. I need to repeat this for angles 40-60 [Increments of 5] Homework Equations I have these...

Question and Data What is the initial velocity of an object that rolls off a table and hits the floor below? Lab produced the following data: Table height: 86 cm Distance of object from table when it hits floor: 23 cm Relevant equations Instantaneous Speed: Vf = Vo + at [I think this is the...

Homework Statement We are doing the Rocket lab in my Physics class, we shot rockets with different caps on them [ Low, Med, High ] and recorded the times. I have the time, i need to find Initial velocity and Height given that i have time. I also need to take into consideration air resistance [...

Physics lab help, determining acceleration thru V vs T graph?? the point was to determine the acceleration due to gravity. It was this whole experiment with a ribbon tied to a brass weight. it was put into a machine and youd drop the brass weight and the machine would mark dots on it to show...

Homework Statement How can the validity of Equation (1) for Atwood's pulley be investigated by means of a linear graph? What quantities would the slope m and intercept b represent here?Homework Equations Equation (1):http://img522.imageshack.us/img522/1916/me4km8.jpg The Attempt at a Solution...

For my most recent lab, the goal was to find the specific heat of lead metal shot. The procedure of the experiment consisted of using the method of mixtures. In this procedure, the room temperature Tr is first measured. Then, an insulated calorimeter cup is filled with water, and the...

Homework Statement We are doing a lab where the teacher took an chalkboard eraser and he put it between to rulers in a hallway. He used some sort of slingshot to project that eraser.( we did not see how far the eraser went) We have to find how far the eraser will travel in meters. All we were...

Hi all at physics forums, I was given the task of proving that gravity on Earth is actually 9.81. It must be a proof/lab design and must be creative. We are not allowed to simply just drop 3 objects with different masses and calculate their acceleration. Need an original idea, not asking for...

In my general physics lab, we are trying to show that certain systems are in equilibrium. The apparatus that we are using for rotational equilibrium consists of a boom resting on an axis point, attached to a string/pully that has a given tension. The measured forces in the lab are in...

This is my first post, if you need any more information I'll try to put it up as quickly as possible. I have a tricky problem in my lab that may lend itself to computer programming, but I have little training in that area. OBJECTIVE: How many peaks are there in my data? DATA: I have a...

Homework Statement You are given two cans to roll down a 1m ramp at angle 15 degrees [and then at 30 degrees for a check]. Can A has a less viscous fluid, broth. Can B has a more viscous fluid, cream of mushroom soup. Now through constant experimentation we find that, can B rolls down...

Homework Statement I'm supposed to design a practical about factors that affect flight. I've decided to use Bernoulli's Principle to help me do this experiment. So I am planning to alter the thickness of the wing (independent variable) see its effect on the horizontal displacement (dependent...

Hi! Can someone give me a general idea of how I do this? In my lab today we a pulley system with two spring balances attached to a long sting. We had to do several configurations and measure the angle and record the reading on the spring balances. Could someone guide me as to how to do the...

one way to determine how the terminal speed depends on the mass of an object is to observe the motion of flat-bottomed coffee filters falling vertically toward a motion sensor. My teacher told me we will do 3 sets of test. first one is with 1 filter, second with 2 stacked filters, and 3rd one...

I got an email from a professor that I've been working closely with for the last 2 years about giving a talk at a big research symposium. He said he would help me with my talk and get a nice presentation together. However, the symposium is not close to me at all. I am in NY and the symposium...

Hi everyone, I just wandered if you know of any materials or internet links that would help me with circuit connections in the lab. I seem to always mess up when I try to connect the circuit based on the drawn scheme. I took Into to Electromagnetism last semester and would always mess up...

I find that in the lab I feel overwhelmed when doing experiments with the rest of the class. What did you guys do to feel comfortable carrying out experiments? I mean, I'm always unsure of what I'm doing..any tips guys?

Homework Statement It's part of a lab designed to find the specific latent heat of fusion of ice using the method of mixtures. The results are in the 1st attachment..I want to find the specific latent heat of fusion of ice from those nos.Homework Equations heat lost by water = heat gained by...

For those afraid of computers or so attached to pen and paper they can't change to an all electronic lab notebook, there is a review on a magic pen that gives you the Onenote benefits (organization, searchability,...) while still letting you doodle away with paper and pen...

Uncollapse of a partial-collapsed quantum state has been accomplished in the laboratory. Here is a popular article http://www.scienceagogo.com/news/20080706233709data_trunc_sys.shtml An article on this by Nadav Katz et al has just appeared in Nature News. I believe this is the preprint of...

this lab is very similar to mine basically i can only seem to derive a portion of the formula, I=mgb/al - mb^2 where b- radius, g-gravity, al- angular acceleration. I do not get the right answer: here is what i did do however, Fnet=ma T-mg=-ma (acceleration is downwards) so T=(mg-ma) so then...

I have a lab and I'm having a hard time calculating or even understanding how to calculate the uncertainty. It wants me to calculate the uncertainty of temperature. Here is my data: time (mins) Temp (°C) 2 23.2 4 26 6 29 8 31.5 10 33.5 12 35.5 14 37.6 16 39.7 18 41.8 20 43.9 Don't I need some...

Hi all. We're moving to a new lab and I need to have a reliable ground for ESD protection, e.g. connecting the ESD mat safely. My questions are: can I just use the ground in the power outlet, or I need to request a different ground? Do I need to connect a resistor between the mat and the ground?

Attach the best pictures of the lab you work in here! Theoreticians can attach pictures of their powerful pc's! My Laser Lab: http://img2.freeimagehosting.net/uploads/5e71c5fd82.jpg

Bacteria Make Major Evolutionary Shift in the Lab This is pretty cool.

Why is it conventional to analyse compton scattering in the lab frame (fixed target) whereas all other processes I've seen are analysed in the center of momentum (colliding beam) frame. Are there any experiments where one would collide electrons with stationary muons e.g.?

I work with acetylacetone in my lab. The MSDS, in the Health Hazard section, lists the target organ as the thymus. I don't think I've ever seen the thymus listed in any MSDS as a target organ. Usually, it's the liver, or the central nervous system. I looked into what the thymus does, and...

Homework Statement I have a problem while writing the uncertainty of datas in my lab report (portfolio). So, here is my question: While multiplying some data with different uncertainties, I do multiply their uncertainties too, right? Then, if the multiplication of uncertainities has...

You find two unlabelled diffraction gratings in your lab. From purchase records, you know that one grating has 5000 lines/cm, while the other has 10 000 lines/cm. Given the following equipment, describe how you would determine which is the grating with 10 000 lines/cm: • Red laser • detection...

Centripital Force Lab - PLEASE HELP! Homework Statement Ok so i need to do this lab, write a report, and prepare a defence for tomorrow pretty much i spin a mass horizontally on a string attached vertically to a force sensor. i hold onto a plastic tube through which the string goes and...

Homework Statement How much frictional torque is there? I know angular acceleration and torque applied. (I do not know if this can be used to find torque friction, though.) Homework Equations The Attempt at a Solution I know that Frictional torque can be found by doing Torque...

Maybe someone can help explain this a little for me. In my lab reports, I am to show qualification of error and then quantify one of those values. Obviously, in some of hte labs, only certain causes of error can be reasonable shown. For example, on the angular velocity lab, I can say that the...

Hello! I am a high school teacher and I am doing a lab on Newton's laws. I need help interpreting part of the lab because the results did not come out to what the laws would have predicted. The lab consisted of setting up two carts, one with a spring which can be compressed and one...

is there a standard font I should use? If there isn't, what font do you use?

Homework Statement Some students had a disagreement about the esterification reaction between ethanol and ethanoic acid. Student A feels that the -OH group from the acid combines with the H from the alcohol functional group. Suggest a hypothesis for his feeling and design a lab to test the...

Does anyone know why fluoride ions inhibit fermentation and why cyanide ions have no effect on fermentation?

I'm studying for a lab exam tomorrow and I just want to make sure of some things. One of the experiments was on the effect of inhibitors on enzyme activity. We were studying the reaction 2 H2O2 (hydrogen peroxide) --> 2 H2O + O2. This reaction uses the enzyme peroxidase. Hydroxylamine...

I'm studying for a lab exam tomorrow and I just want to make sure of some things. One of the experiments was on the effect of inhibitors on enzyme activity. We were studying the reaction 2 H2O2 (hydrogen peroxide) --> 2 H2O + O2. This reaction uses the enzyme peroxidase. Hydroxylamine...

So, in the lab that my class just finished for angular momentum, we had a rotaring hollow cylinder rotating and we had to drop an iron disk square on top of it to measure the momentum before and after to verify conservation. The professor inquired how the result would be affected if we had...

A metal disc is placed in a uniform magnetic field of flux density,B,acting through the plane of the disc at and angle,\theta.When the dis is rotated an e.m.f. is induced between the centre and the rim of the disc. http://img158.imageshack.us/my.php?image=scanlc2.jpg Design an experiment...

Everyone in my office (8.5 x 3.5 x 6 meters) was complaining of dry eyes/throat. We thought "hey we should check the humidity". We bought two separate humidistat's that both read 15% RH at 73 degrees F! So we bought a humidifier. Just one of the small ones that holds 2.2 gallons and empties...

Homework Statement A sol;n of 14.05 mL of NaOH is mixed with 50.0 mL of 0.2102 M H2SO4 (standardized) and allowed to react. The sol'n (H2SO4 and NaOH) is still acidic, so it is titrated with 10.55mL of standardized KOH (0.08883M) until the equilivance point is reached. What was the...

The vapor presurre of mercury is 0.00185 mmhg at 25 degree C. A single drop of Hg(0.1 mL) is spilled in a laboratory of dimensions 10m x 10m x3m. Does the entire drop evaporate? What is the partial pressure of Hg in the laboratory? (Use 13.6 g/ml for the density of Hg.) (b) The normal boiling...

Which Lorentz transformation takes the lab system to the CM system? Lab system: p_a = (E^{lab}_a, \vec{p}_a) and p_b = (m_b, \vec{0}) CM system: p_a = (E^{CM}_a, \vec{p}) and p_b = (E^{CM}_b, -\vec{p}) For a binary reaction a+b->c+d, the textbooks I have say quite a lot about the...

[SOLVED] Biology Lab Abstract: Photosynthesis Homework Statement I am having trouble understanding how increased transmission is an indication to photosynthesis occurring. My teacher gave us the prediction for this lab: if photosynthesis is happening then transmittance goes up. I know...