What is Lab: Definition and 1000 Discussions

Homework Statement Find the mg of Fe in vitamin pill. Vitamin pill was dissolved in 25mL HCl which was then diluted to 250mL with water in flask. 25mL of that solution was then diluted to 100mL in another flask. 10mL of the second was diluted to 100mL in another flask. Absorbance of the last...

I thought this internet application created by http://lindenlab.com/" was interesting: http://en.wikipedia.org/wiki/Second_life http://secondlife.com/ It takes the idea of a video game to an extreme. Video games normally either capture some specific portion of real life (i.e. life...

I found this link and thought it may be of some use to build a power supply. I know that these power supplies can pack around 500W on the right power supplies. Is there anything I should know and be careful of when making this and when playing with smaller electronics...

So we did a lab this week in my physics class. We had a car on a horizontal table, that was attached to a string with weights (The weights were over the edge of the table.) We then calculated the experimental acceleration and the calculated acceleration. These numbers were different. My...

Hi all, I'm measuring multiple coulomb scattering by using 4 chambers filled with He gas, and lead plates between the top 2 chambers and bottom two. The chambers have a potential difference across the plates so when the muons ionize the He gas, a spark is produced. A camera marks the pixels...

The purpose the lab is to get a 1kg mass on a long spring (approx 3meters) to touch, without cracking, the top of an egg. To do this, we need to solve for the height needed to drop weight from. I'm not sure how to solve the problem and I have been using the following formulas: F=kx...

Homework Statement Okay so I received this lab called Determining the Chemical Formula of a Hydrate, but I was not there to do it with my group..but I still had to answer these two questions. I was wondering if someone could help me answer them? >< Or explain?! >< CuSO4 . xH2O...

Hi guys, I thought this would be the best place to post, We are currently preparing for our physics course work assignment (I am in year 13, 17 years old, in the UK). We have to come up with at least three idea before we decided on one to do. Now I have thought of quite a few but I don't...

Homework Statement the main idea is this i have an 'Alternate current' I which i know the intensity I have also 2 Helmholtz plates of radius 'R' separated by a distance 'R' (the separation between plates is equal to their radius ) then by magnetic induction the alternate current 'I' we...

Homework Statement Fill the sauce pan with tap water. Set it close to the stove. Place about 2 tablespoons of water into the empty can. Heat the can on the stove until the water inside boils. This will not take long. You will see water vapor coming out of the top of the can when it is...

Homework Statement Which salt will make the best hot pack when combined with water? Independent variable: Salt Dependent variable: TemperatureIn the experiment I have a 50 ml beaker of water and I measure the initial temperature of the water. It was 24.5 degrees Celsius. I then add 10g of...

Check my work please! Homework Statement given/known: -mass of rocket 140.25g -Gravity -time 6.91s(up and down) -or- 3.46s (one direction) Ideally, the rockets were supposed to go straight up and straight down, and even though this obviously didn't happen, we are assuming it did. It...

First of all, I'd just like to apologize for me asking for help in my first post. I know that seems kind of lame. Homework Statement The lab involves an Atwood's machine which is basically two masses attached to some kind of pulley system so that if the masses are equal, the system will be...

I have a rack mount quad lab laser it has 4 series wired SMA905 connectorized diodes.I am wanting to use two of the to pump a Spectra Physic Millenia 1st generation 1064nm laser cavity which has 2 FC female connectorized collimation lenses. They pump a 4x4x7mm water cooled YVO4 crystal from two...

Homework Statement diffusion thru a semipermeable membrane. Homework Equations section 1 of the lab LAB - dialysis tubing containing distilled water and the beaker containing glucose and starch .. put it in water. Leave it over night and jot the changes, it goes through osmosis but...

Before I begin, let me say this is my first time on this forum, and am terribly sorry if I screw something up here. Let me also say that my physics lab is ahead of my physics class, so my knowledge on angular momentum is lacking. Also, this lab is due tomorrow. I know it's short notice, but I...

Did the rocket lab in my physics class Shoot a air compressed rocket off of a base that can be angled (though we did not get to angle the rocket) shot it upward and what not. It had 3 different caps (lo, med, hi) and we did each one three times and recorded the data. The problem is I was...

Homework Statement Calculate the average ratio of grams of hydrogen gas produced per gram of magnesium. This is part of a lab in which I know how many grams of magnesium were used and how many ml of hydrogen gas was produced Homework Equations Mg (s) + 2 HCl ---> MgCl2 + H2 The...

Homework Statement Hello . I am french educated , and now we're studying chemistry lab in english ; everything is easy but to understand the technical word in english is a bit hard . but the teacher is cute and pretty so i Like the Lab class anyway she told us to resolve and make a...

Homework Statement I was asked to plot a distribution curve, but before that we had to deal with working means instead of a real mean. So the problem is :is it ok to plot a normal curve based on the standard deviation from the working mean? We were asked to compare our results with antoher...

One of my prelab problems for physics 3: The Moon is about 4*10^8 m from the Earth and has a diameter of about 3.2*10^6 m. You want a radar antenna which just covers the Moon with the central spot of its diffraction pattern. If the radar wavelength is 10 cm, what is the diameter of the radar...

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 We did an experiment mimicking how there's force between the moon and earth. I just want to know how the graph should be between 1.time and Force of centripetal and 2. velocity and Force of centripedal. is it proportional, inversely proportional, or increases as the...

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 temperature...

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...

I know i have a calculator that is way more advanced that what my class needs and that is my problem.. everyone is using a ti-84 plus or something and I am using a ti-89 titanium... but any ways during a physics lab the class did a simple graph using their ti-84's and as i am trying to convert...

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...

1. 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 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...