Lab Definition and 1000 Threads

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...

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?

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

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...

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...

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...

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...

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...