What is Lab: Definition and 1000 Discussions

The digital CT (current transformer) operated energy meters are tested in field using consumer's load conditions by means of a parallel test equipment. It was observed that the reactive energy measurement has high accuracy mismatches on harmonic polluted loads. Some literature indicates that...

When subtracting measurements that each have a certain level of uncertainty, we can end up with huge levels of error if the two measurements are roughly equal in value. However, this problem doesn't appear when adding numbers. Question: Is there a name for this type of error? Does anyone...

I’m confused on how to calculate molar solubility because I don’t see what’s the difference between that and Ksp.

<< Mentor Note: Thread moved from the technical forums, so no Template is used >> hey guys As the title suggests i need a little help with my results from my thermofluids lab, i am trying to come to a conclusion about two of my graphs which are attached. The lab is looking at measuring the...

Homework Statement Hello, I have a problem with my data analysis from my lab. My goal is to find drift velocity of the electron and it's diffusion coefficient. The experiment looked like this: I've measured the time difference between signals on two gaseous detectors. The source of the signal...

Homework Statement Homework EquationsThe Attempt at a Solution I don’t have a clue on how to do the calculations. I know the equivalency point is at the steepest part of the derivative graph. Please don’t say just figure it out, I truly need help. I haven’t learned titrations in lecture yet...

Good evening, In the following weeks, I will be performing a lab project during three sessions and one of the things that I have to do is to create a microscope using a set of lenses (We are using a 50mm focal length convergent lens as the objective and a 100m focal length convergent lens as...

Okay, so I did an elastic collision with Vernier carts and magnets. The results seem pretty good. Cart one started with -0.1205 kg*m/s ended with +0.1027 kg*m/s Cart two started with +0.1174 kg*m/s ended with -0.1118 kg*m/s So Total before = -0.0031 kg m/s and total after = -0.0091 kg m/s. If...

Hi, I want to try out a bit of machine learning or deep learning with an optimisation problem in the lab. However, I'm confused at what the best option would even be or whether my optimisation problem is even applicable to either. Firstly, the lab set up hasn't been built yet, I am computing...

Which of the following will burn your skin if you get it on you? a. concentrated sulfuric acid b. concentrated nitric acid c. concentrated potassium hydroxide d. concentrated hydrochloric acidMy first instinct was that all of them would since they are either concentrated acids or bases. I then...

Hey everyone. I have a lab with questions we have to answer but I don't really have any access to equipment. I still have to answer the questions to the best of my ability and any help will be appreciated! 1. Homework Statement A string is attached to two retort stands and two equal masses...

Homework Statement The lab: Centripetal Force Lab a Rubber stopper is moving in a horizontal circle at a constant radius and it is attached to a string where at the bottom, there is a mass where the mass is 100g, 150g, 200g, 250, and 300g (can see image attached) from the lab, I collected...

Homework Statement We had a lab on projectile motion and one of the questions was this: Use your Vy versus t graph to determine the y-component of the acceleration of the puck. Should this be equal to the acceleration due to gravity (9.8 m/s)? Explain why it is or why it is not. The...

Homework Statement Suppose that, for reaction 4, you could not find the bottle of 7 M H2SO4 so you added 5.00 mL of the 1.00 M H2SO4 instead. How would this impact your final yield of Copper. (Show with calculations how this would impact the limiting reagent.) Homework Equations CuO(s) +...

I teach high school astronomy. I have been searching the interwebz for a lab or "meaningful" activity related to uranus or neptune, and have come up empty handed. I have found several lab manuals from different universities and I'm beginning to think that such a lab or activity does not exist...

If I have a KF Triation result using Columetric sampling method and my first sample is 59.22 and second is 60.65 and third is 22.03 what does this tell me about the water content of my fuel. The lab I used to use gave me a lamens terms definition.

To self study the theoretical part of general physics is as "easy" as going through a textbook, but how could a person self study the experimental part of general physics at home? Any ideas? (Should be easier than to self study chemistry lab hahaha)

Hi everyone, I recently got a job through my instructor to design labs for a new course we are offering. It is Engineering Statistics for Electrical and Computer engineering. We will be using Yates text. We previously had to take a engineering stats class in the math department that is more...

Homework Statement I have done tests on this unknown bacteria and this were the results: Cocci shape Gram (-) negative Catalase (+) positive (only one bubble though) Oxidase( - )negative Has endospores (used Schaeffer-Fulton method) Antibiogram: Resistant to Streptomycin...

Homework Statement Ladder leans against wall at angle θ. It is L meters long and mass m. Find the coefficient of friction with the floor. Assume no friction at the top.[/B]Homework Equations ΣFx = 0 ΣFy = 0 Στ = 0 ƒ = μFn (Fn being the normal force with the ground) The Attempt at a Solution...

I'm assessing criticality safety of a waste removal plan for a (theoretical) abandoned russian laboratory. In the laboratory plutonium was recovered from fuel rods. The room is mainly empty except for a dissolver, a sump below the dissolver and spilled metal chips on the floor. The dissolver...

1) Is it possible to create crystals at home beyond child crystal kits one can buy? I'm very serious about putting work into studying and growing crystals. If so, what do I need? 2) Also how would it be possible to introduce vacancies in crystal growth ? I have heard of things like ionic...

I can't understand the exponential function fit for this set of data works well: ExpDec2 exponential function fit 0 3,04 10 2,77 20 2,52 30 2,27 40 2,09 50 1,92 60 1,75 70 1,62 80 1,51 90 1,43 100 1,36 110 1,29 120 1,24 130 1,19 140 1,14 150 1,09 160 1,05 170 1,02 180 0,99 190 0,97 200 0,95 210...

Homework Statement I need to find the coefficient of kinetic friction from a set a lab data that I found. I had a mass connected to a mass hanger by a pulley, and measured the acceleration of the mass with various amounts of mass on the hanger. In the attached image, the acceleration was...

Homework Statement Homework Equations Equations posted in pictures attached The Attempt at a Solution I haven't attempted it yet because I am confused about something. If the-cv^2 case is for objects that hit terminal velocity at the fastest rate, why are my graphs showing that I should use...

I tried looking for my unknown (209.70 g/mol) online and couldn't find it. The closest I found were H4O7V2(217.907 g/mol) and HCl2I(198.819 g/mol), but I know I am correct to a 2.7% accuracy. What other lists can I use to solve this?

Homework Statement Determine sources of error which could have affected the results. Some background information: The lab consisted of playing a tone generated by a tone generator above a standing open-closed tube which had water in it. The first harmonic was measured through a computer system...

Homework Statement Homework Equations n/a The Attempt at a Solution I'm kinda confused on the instructions of this net ionic lab. For this lab, I am suppose to find out how several solutions (6 of them) react with each other to form precipitates. We use some systematic way to test these by...

Homework Statement Calculate the speed of sound in the classroom. You can use: Tuning forks, water, beaker, pvc pipe, ringstands, etc. Homework Equations v = f(wavelength) For fundamental frequency: L = 1/4(wavelength) For fundamental frequency: f = v/4L The Attempt at a Solution Here is...

<< Thread moved from a technical forum, so no HH Template is shown >> Our teacher gave us a lab, and we have to write a procedure on how to test the electrical conductivity of multiple substances. However, on the materials, all that was written was "electrical conductivity tester", which I'm...

This isn't a problem assignment per-say, but for a lab calculation. In my mechanics of material's class, we learned that the radius of Mohr's circle is the maximum strain, but now in my application lab-based class, the video is saying the radius is equal to the maximum strain divided by 2. So...

I have uvex stealth anti-fog chemistry goggles, and in lab the lenses build up with dew. It becomes so bad that I can't see and I have to regularly exit the lab every 15 minutes to wipe them off. I sweat when in the lab, so I'm not sure if that's why . There's no fog, just pure dew drop...

Homework Statement I need to calculate a spring constant using measurements from a Hooke's Law Apparatus, a spring, and some weights. The weights are hung vertically from the spring and the distance is measured from the equilibrium point of the spring. If I'm solving for k, then k=F/x. I do...

Homework Statement Hello, I am currently attempting to complete a lab report involving the calculation of the total amount of CaCO3 in an unknown antacid tablet. This was done by calculating the pressure inside a flask before the reaction, then relating it to the pressure after the reaction...

This is a pretty dumb question, but I honestly just need some advice as to which option to go for. I'm in first year and one of my courses this term is computer science where we will be using matlab. Matlab isn't free- I know that, but my professor said we have two options available for us to...

Homework Statement This isn't really an actual homework question but it is regarding a lab so I think it belongs here. In the ripple tank lab I have to trace the nodal lines, plot 3 points in the middle of the 2 lines (one closest to the two sources, one in the middle and one the farthest)...

[Note from mentor: This was originally posted in a non-homework forum, therefore it does not use the homework template.] we did a lab on catapult but I'm having trouble figuring out the math? i calculated the hangtime, but all i did was take the original time and divide it by 2, is that right...

Hi! So it's new for me to do physics lab that way and my teacher is asking us to define the independant, dependant and controlled variables of every lab we're doing. I'm not quite sure what they refer to... For example, in a moment of inertia lab (see picture), I am asked this question. The...

So I'm doing a lab in class, and when I graphed the Period vs Length of the string, I got it in the form $T=A\sqrt{L}$, but I don't really know what the value $A$ represents nor what its unit is... Can someone help me?

Hi educators, This may sound dumb, but my physics lecture room is our lab as well and we spend long hours in class. We spend approximately 4 hours for lecture and other activities and 2 hours for labs. Currently, I have a strict rule that only drink is allowed during lecture and other...

I did torque and equilibrium lab report, where I had to hang some weights on a meter stick, which was placed on a fulcrum. There were 3 parts for the lab, with different settings. I am stuck at the last part, where I hang the meter stick with a string over a pulley, and there were 4 weights...

Homework Statement Fill-in with the correct tank letter or the condition (eg. PPM of O2) Refer to above Chart A: __1. Which tank contained the lowest PPM of Oxygen? __2. Which of the 4 abiotic conditions(02, C02, PH, or Temperature) is most out of line in tank...A-G? __3. Which tank has a...

Good evening everyone. For my third year optics course we have to do a research lab that includes a lab component for a project. Our prof has suggested we look into something that interests us an design a lab around it. Personally I have always had an interest in military technology and was...

Homework Statement I've completed an experiment where the dependence of magnetic field strength ##B## on current ##I## is measured at the midpoint along the axis between two Helmholtz coils (separation distance = coil radius ##r##). I got the expected linear relationship from the data but am...

Homework Statement In lab, we put a glider on an airtrack and used a pulley to move the glider. The mass on the pulley was changed with each iteration. I have created a graph to find the mass of the glider, but I don't know what the y-intercept is supposed to mean. The graph I have is linear...

Homework Statement We did a lab where we had one cart with an unknown mass stationary on a friction-less surface. Another cart with a mass of 378.9g, was pushed down the track (which moves at a constant speed due to the friction-free surface) and collides with the second cart - so it is a hit...

Homework Statement I've linked my data table down below. My problem is the relative intensity column. From the table, the units of relative intensity are w/m/s. I'm assuming this is power/velocity, where velocity is the speed of light. However, nowhere in the lab manual did it mention the...

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...