Lab Definition and 1000 Threads

Homework Statement I have a percipitate lab. We have an unknown sulfate powder that we mixed with water and then added Barium Nitrate in order to get the sulfate out of the mix. The entire sulfate, nitrate mixture was mixed with HCl to make the particles bigger and then it was heated for...

I've heard of the difficulty of getting tenure-track professorships at R1 institutions, but I am curious about the competition at national labs (staff positions). How competitive are they? I have just started grad school at an ivy league, for reference.

Homework Statement We performed an experiment to see which laboratory glassware was more accurate and which was more precise. Question: (a): Which glassware was more precise and why? (b) Which glassware was more accurate and why? Use the calculations to support your statement. I won't post the...

Homework Statement (see my attached photo to better understand where I am coming from!) So after some research, I've discovered that the current at different points in a simple series circuit is supposed to be the same value, and that the voltage is supposed to be different values. I...

Hi guys! (see my attached photo to better understand where I am coming from!) So after some research, I've discovered that the current at different points in a simple series circuit is supposed to be the same value, and that the voltage is supposed to be different values. I performed a lab on...

So in my experiment we combusted Magnesium ribbon to form Magnesium oxide. These were the reactions: Mg(s) + N2(g) + O2(g) → MgO(s) + Mg3N2(s) MgO(s) + Mg3N2(s) + H2O(l) → MgO(s) + Mg(OH)2(s) + NH3(g) MgO(s) + Mg(OH)2(s) → MgxOy(s) + H2O(g)...

Hiya! In school we have tha task to create our own phy lab. I am going to investigate the width of a hair using wave diffraction (a laser maybe?). Does anyone have any creative ideas on how to develop the lab to make it more uniqe and interesting. E.g measuring from different distances. Or...

Since @BillTre mentioned he was previously interested in generating fish sperm cells in the lab, I though I'd share a recent article from MIT's Technology Review magazine covering recent advances in reproductive biology toward generating sperm and egg cells in the lab through cellular...

Can anyone test for or give reference for lab testing white ginseng % purity? I can send sample by mail. Thanks, morrobay

Background: Physics and Math major, turning Sophomore from next semester. I worked for a professor during the summer (for free) in high energy Physics trying to plot the signals from a function generator to a computer using a microcontroller. He was really impressed with my work (basically, he...

Really struggling with this! Here is the data: Concentration of NaOH: .104M Mass of Aspirin #1: .367g Mass of Aspirin #2: .365g Volume of NaOH mixed with Tablet 1: 50ml Volume of NaOH mixed with Tablet 2: 50 ml Trial 1 Mass of Na2CO3: .065g Initial volume of HCl: 18.80mL Final Volume...

Homework Statement In a particle physics lab, an electron e− and a positron e+ collide, annihilate, and produce a W+ boson and a W− boson. Just before the collision, the electron and positron have a total energy of E = 100 GeV each, with velocities pointing along the +x-axis and -x-axis...

Hey Physics Forums, I have what might be a dumb question but I think it's one that a lot of professional physicists can answer. I also think it's one that a lot of people like me might be curious to know the answer. Context for me is I'm a graduate student trying to understand my future...

I recently accepted a job as a Lab Tech. I am pretty happy about the job but I'd want to move on to something more like a Research assistant eventually. I don't know if anyone here is familiar with biology/biomedicine but is a jump like that possible? Thanks.

For chemical experiments that involve gases as reactant and products, gas tube are used for their transport. Q1. Why are there differences in length of gas tube when in a round flask. In most case, entering tubes are longer than exiting tubes? Why is that? Q2. Why is sometimes the entering...

I'm currently finishing up my second year in college and I'm expected to graduate on time (in two years) and I'm majoring in pure physics. I don't really fully understand the difference between applied physics and pure physics because anytime I look into it online there's 10 different answers...

Hello I'm trying to come up with a solid Lab to use for my chapter on Waves and Optics. I am considering having it center on refraction. Here is the problem: All labs I create for my class must avoid being a set of instructions for the student to perform. The must always be set up as a...

Hello fellow physics friends (alliteration: always a strong opener). I am writing today because I find myself struggling to complete something which ostensibly doesn't seem that difficult to the average physics undergrad working in a lab. However, electronics and circuits are definitely a...

Lab production of 2,6-Xylidine appears to be difficult. Apparently either the production or reduction of 1,6-dimethyl nitrobenzene is "hard". Industrial production involves 50+ atmospheres of pressure, which falls far outside of my definition of "lab production". I'm interested in taking a...

1. The problem statement of my lab I have this physics lab where I have to find the maximum velocity and maximum acceleration of a high school student sprinting/running using carbon tape and a spark timer. Which I already did. Now I'm having trouble developing my sources of error section. I hope...

Hello all, I am a lab technician for a university and I am having some problem with some lab equipment. We are doing an RLC circuit lab with a frequency generator, oscilloscope, decade resistance box, capacitance box, and inductor. The equipment is connected in series, except for the...

Homework Statement In this lab we are going to be given a mixture containing sodium chloride [NaCl], silicon dioxide [SiO2], Iron filings [Fe], and calcium carbonate [CaCO3] The goal of the lab is to use separation and measurement techniques to determine the percent by mass of each specie in...

I'm updating some poorly written lab activities for an online physics class that I have been given, and I am going through the experiments and doing them myself to better write them. I came across this one, and I have no idea what the results are supposed to be. It comes after the chapter on...

< Mentor Note -- thread moved to HH from the technical forums to use a scpecific schoolwork problem to illustrate the general concept of torque in a FBD > I'm writing up a lab report for Physics class and I have to draw FBDs for torque being applied to a ruler resting on a pivot point. I've...

Homework Statement We did a lab experiment for isentropic efficiency of a compressor and was asked to plot the following graphs, change in stagnation pressure across the compressor (∆p0) vs air mass flow rate, and isentropic efficiency vs air mass flow rate. I have plotted the graphs but not...

Can you understand physics if you are good in math and suck at proving something practical?I tried to do that and it only worked in hs.I have never realized that i need materials to do the trick.Do you need a lab to see what happens and than explain the phenomenum or you can apply math without...

Mentor note: Two threads got merged, the first nine posts are a mixture of two original threads. http://science.sciencemag.org/content/early/2017/01/25/science.aal1579 The rest is behind a pay wall. From the abstract alone it is somewhat unclear whether or not this metallic hydrogen remains...

Here is the attachment for my lab and just need some clarification and guide if I am going in the right direction?// Januaray 24 2017 // Lab 0 #include <iostream> #include <string> #include <cmath> using namespace std; const int COLUMS = 5; int a; void findMin(int a[], int size) { int min...

Is there any software, free or commercial, which students can use to perform physics lab experiments online? I'm looking for a software for college physics, say, from Linear motion, motion under gravity, Newton's laws, Energy, momentum, Rotational dynamics, to Heat and Thermodynamics. CD or...

Homework Statement I have to write a report based on an experiment I conducted with the class in the school lab. The experiment was about orifice plate meter and venturi meter (both to measure rate of flow of fluids; this is an introductory fluids mechanics module I am studying). The...

I have a chemical reagent that says: Assay ... 93.0 ~ 103.0% Which value should I use in theoretical computations? Should I take the average or the lowest value? Thanks!

Homework Statement Hello all, I am doing this lab http://scc.scdsb.edu.on.ca/Students/onlinecourses/Sikora/sch4u/v12/60.pdf i am stuck on trying to find hte concentration of ch3cooh Homework Equations n = m / M and c = n*vand i think the ideal gas law could be used but not sure The Attempt...

Homework Statement We were given five samples of nichrome wire, each with a different diameter but the same length. A micrometer was used to measure the diameters. We then measured and recorded the electrical resistance, R in Ohms of each nichrome sample with a DMM. I will try to summarize all...

Homework Statement So referring to this lab , http://static3.mbtfiles.co.uk/media/docs/newdocs/international_baccalaureate/physics/824297/html/images/image12.pngIn this lab you are holding the plastic tube and twirling it to make the small mass spin in a circle. Keep in mind there is a mass on...

Homework Statement Mass =0.908kg Area= 5.3 x 10^-4 m^2 2. Attempt This was for a lab I am doing on gas laws. Its asking to calculate exerted pressure in kPa. This is what I've done so far : F= 0.908kg * 9.8m/s^2 = 8.8984N Pressure = Force/ Area Pressure= ( 8.8984N) /( 5.3 * 10^-4...

Millikan Oil drop experiment. For my current lab, we are recreating the milian oil drop experiment to measure the charge of an electron. However, we are using 1-micron diameter latex spheres in place of oil drops. Problem: I am having difficulty deriving an equation for the speed of the drop...

I'm currently in first year engineering and I seem to be struggling with Physics, which is not unlikely uncommon. A simple problem I've come across is not doing correct error analysis when writing up lab reports. In my current lab, which is justifying the relationship of angular frequency...

I appreciate the link to the field strength calculator. http://www.calctool.org/CALC/phys/electromagnetism/solenoid I'm also looking for recommendations on sources for magnets. What I'm trying to do is put together a Faraday Rotation Effect Lab. This is my Faraday Rotator, a 12 cm x 2.0 cm...

Homework Statement Ball mass = 0.0027 kg PE (0.5 meters) = 0.01323 J height of ball after three trials = 0.19 meters KE before bounce = 0.01323 J PE at new max height = 0.00503 Total energy = KE + PE Ke after bounce = ? Homework Equations mgh The Attempt at a Solution I did a lab where I...

Homework Statement Assume no friction for 1 - 6 1. Draw a free body diagram of the fly wheel (from above), and a free body diagram of the weight (from side). 2. What force appears in both diagrams? 3. What is the relationship between the torque on the flywheel and the tension in the string...

Homework Statement Hi, we had a Lab Activity on the Coefficient of Friction, but right now I am really confused and stuck. Since the teacher used an online resource, we are supposed to make two graphs based off the data and it's very unclear and unhelpful. :( I can't seem to find anything at...

Homework Statement "In part 2 of the lab you will be firing a water balloon over a tall fence, aiming to hit a target." The fence is 3 meters high. You may fire the balloon from anywhere behind the fence, up to 4 meters away from it: the target will be 20 meters away. Find the angle to shoot...

Hi everyone, I have to answer some question about a physics lab..here are the questions A tank is empty by a pipe and we measure the height (y-y0) of fluid in the tank as a function of time. We obtain this graph ( I join the graph) We can find the relaxation time with the relation : with...

Homework Statement Hi, I am doing this lab this week, but before I do it I have a few questions. ( it has to be completed in class so I want to be prepared). First, these are the three pages of the lab questions...

Homework Statement Hi! So I'm trying to write a lab report about testing BSA solutions for protein concentrations using a Biuret reagent and a spectrophotometer. There is a portion that asks you to give some practical applications for this test and how it applies to biology. The only thing I...

1) Plot given coordinates on layout supplied and label them accordingly. The scale on the layout is 1” = 20 ‘. 2) Using the given tope data, draw the level plan on the layout. The station coordinates and topping data are available in the excel file enclosed.

This isn't really a homework question but I do have to know it for my lab report so I figure this is a good place to post it. So for my lab we had the setup that is displayed in the picture attachments. My question deals specifically with step #9 of the lab instructions. I'm assuming that the...

Homework Statement We conducted experiments using copper wires to observe the effect length has on resistance. We measured lengths from 5 - 30 cm and used a multimeter to measure the voltage while supplying a constant current from a power supply package. The multimeter measures in mV. Plotting...

Homework Statement We recently conducted a physics lab in class where we designed an experiment to "prove" the kinematic equations. We used photogates, ramp and a car. Homework Equations We have to show v = u+at and the other kinematic equations are true with our collected data. The Attempt...

Hello, I'm an Aquaculture Engineering student at lima. I'm trying to do an experiment of electrochemical harvesting of microalgae. But it seems my weakness at physics its getting in the way plus i don't know to well how to operate the equipment which none knows either since its new to the lab. I...