What is Lab: Definition and 1000 Discussions

Hi, I am working on a biology lab regarding the tree algea, pleurococcus and how its density on trees is affected by direction (N,S,E,W) and light received from each direction. Here is a screenshot of the data I have access to: http://tinypic.com/r/jugxa1/6 My question is: what would you guys...

Homework Statement I am not sure why our professor is making us do labs that are 6 chapters above where we are, but here it is: Compute Vout if Vin has an amplitude of 1V and a phase shift of 0 degrees. Homework Equations V=RI V=jωLI V=\frac{1}{jωC}I ω=\frac{1}{\sqrt{LC}} The...

Physics help please -- Sources of error in lab experiments Ok so i need some help with a few labs.. some I've tried out and a few i just can't get.. what i want to know is whether the limitations and sources of errors that i wrote down for each of these labs are correct or not and what i could...

Homework Statement A dot on the floor with a diameter of 2cm. A table that is at a distance of 46cm horizontally from the center of said dot. The table is 90cm tall. The meat of the problem: A ping pong ball rolls off an incline plane (a wooden board) that is on top of the table. The...

Hey, I'm wondering if there is a small reference book/sheet or so around for writing up experiments in undergraduate lab work, mostly in the error analysis? How did/do you go about deciding on how to calculate various errors? Thanks!

Homework Statement Would anyone know of a website where I can read lab reports, i.e. the abstract, discussion, results etc of physics experiments? Though non-physics experiments may be ok too. Just so I can get a feel for how they are professionally written. I've tried using a search...

My name is Frederico Cantarelli. I am a Lindenwood University student, located in Saint Charles Missouri. I am senior level majoring in Business Admnistration! I will explain my situation on the lines below. For graduate in Business Admnistration at Lindenwood University, i will need 128...

I am a new grad with a very theoretically based B.A. in physics from a liberal arts college. I am devoted to physics entirely, but I couldn't bring myself to make the commitment to graduate school so soon. I'd like to try to find work in a physics field, but I don't know where to look. My...

Homework Statement This is for a qualitative analysis lab. The unknown solution can contain any combination of the following ions: Na, Mg, Ni, Cr, Zn, Ag, Pb, NO3, Cl, I, SO4 Tools available: Bunsen burner for flame test, centrifuge, hot plate, and all the test tubes and DI water you...

Homework Statement I was instructed to fill a graduated cylinder with approx. 90 mL of water and lower a marked tube into the water, taking note of the height of the air column above the water. Vibrating a 1024 Hz tuning fork above the opening of the column I found the shortest height of the...

I've never been good with labs and often have bad luck with them as well because what usually happens is equipments do funny things that only happens to me. My old TA tells me he purposely checked my equipments before the lab and sometimes, funny thing still happens and it frustrates him. But...

Homework Statement Hi,there is a question from my textbook: Name FOUR substances commonly found in the laboratory to prepare magnesium sulphate by reacting with dilute sulphuric acid. Homework Equations The Attempt at a Solution Here is my answer: Mg(OH)2,MgO,MgCO3,Mg(HCO3)2...

I've heard Iron has the most condensed nucleous out of all the elements, and I asume it is due to the enormous amount of pressure in a stars core just before the end of its life. My question is if we made iron in a lab, would its nucleous be just as condensed as natural iron or would it be...

Homework Statement A block is given an initial speed of 3m/s up a 22° inclined plane. How far up the plane will it go? How much time elapses before it returns to its starting point? Homework Equations D = 1/2at2 a = Δv/t Vf2 = Vi2+ 2a*d The Attempt at a Solution The Vy is 1.12m/s...

I'm doing an REU this summer in a topic that was incredibly interesting to me based on my previous research experience. I love working in that lab, and everyone is nice and well-rounded. The PI is easy to talk to, even though he's busy. This summer though, I'm working at a very highly ranked...

Hello, I am looking for assistance from you chemistry maestros, geniuses, and experts on how to handle a 5-day lab of identifying unknown compounds using limited resources. We were given four unknown compounds and a list of fifty possibilities. I am not as interested as in you guys...

I work in a nano-optics group, and need an IR thermometer with certain specifications. Online I have only come across cooking thermometers and industrial thermometers, so I need help finding one for a physics experimental lab setup. Specifications: - high accuracy, and pin-point surface...

Hello, I need some interpretation/analysis of the air HEPA filter results for my school project. I don't know exactly what are the standars of those elements(Al,Br etc.) so I can't say if they are below range or above range. Please, if someone can help me I'd be very grateful. Here is the...

I am trying to design a refraction lab involving the critical angle and I have an idea but I'm not sure if it is good or, for lack of a better word, stupid. Here it is: Using a laser and a rectangular container filled with water, I will shine the laser at the container and rotate the angle at...

Homework Statement Hi, I did a lab for a high school physics class where we measured the mass of an electron using a solenoid and our working equation was this: m = qB2R2/2V I was able to do the lab and get good results, but I have discussion questions I don't know how to answer. I...

1.hi, I am new to this forum and i have a question regarding my final physics lab: A solid spherical ball, R= 1.4 cm and m=95 grams, is released from point A(1m above the). After traveling through the loop, the ball exits the set up as a projectile and land at point B with the horizontal...

Homework Statement I would like some analyses criticisms. This is what my analyses should contain - An analysis and discussion, which minimally should address the following: o A summary of your results. o A justification for procedural decisions. o An analysis of the graphs, and...

I have 100 data points that I want to fit in Excel I can do this with NORMDIST no problem but I'm also trying to do it without it to no avail! I'v tried plotting the data using the Gauss function: y(x) = \frac{1}{\sqrt{\pi \sigma^{2}}}e^{\frac{-(x - x_{0})^2}{2\sigma^{2}}} where x is a data...

Homework Statement What will the affect be on the potential of the cell if salt bridge isn't wetted? If the salt bridge isn't wetted with KNO3 how would it affect the measured potential of the cell2. The attempt at a solution So I thought that the potenital will be more negative because since...

Homework Statement 1) Show that the expression for the mass per unit length, μ, of a wire in terms of its density and diameter is μ = \frac{πρd^2}{4} 2) Using equations (3) and (4) show that the expression for the error in frequency in terms of the error in length and the error in diameter...

Homework Statement This is a lab report that I'm working on. I'm almost done, except for the last part which consists of finding the error in the result for our heat transfer coefficient h using Newton's law of cooling. I've tried this in different ways but I can't seem to get it right. We...

I'm working on a lab where I have to go into some detail about moment of inertia. I understand the concept and everything but am a little confused by the equation that I found on wikipedia. I've seen only two equations for this: momentum=torque divided by angular acceleration and one...

Homework Statement I have two columns of data to graph from a lab we did on spherical lenses. The instructor showed a quick and dirty sketch of what our graph should look like - a decreasing curve. My data plots as an increasing linear graph. If I flip the x-axis data top to bottom I can...

Homework Statement B. Torque Due to Perpendicular Component of F 4. The tension in string 1 (on the left) is not known, so we will calculate the torques about this point (10.0 cm). (That way, there is no torque due to the unknown string 1.) Calculate the torque due to the weight of the meter...

When you shine light through a diffraction grating/double slit/single slit, I understand that you see an interference/diffraction pattern on the wall, so that you have: light source -- grating/slit ---pattern on wall But if you put a grating/slits between your eyes and a light source, why do...

Hi, I'm an undergrad looking to do some work in a lab specializing in optomechanics. I don't know a whole lot about the subject though. Could the nice folks at PF suggests some texts/textbooks/papers etc. that can help me become acquainted with optomechanics? Much thanks.

Homework Statement Please go to: http://web.dsbn.edu.on.ca/~andre.huyzers/FOV1-000DC3EC/FOV1-000DC3EE/Lab%20Centripetal%20Force%20.pdf?Plugin=Loft Evaluation Question (E) Homework Equations The Attempt at a Solution Well I was thinking that as the frequency of revolution of...

Homework Statement Hi, I'm having a little trouble understanding some of the results retrieved from my engineering mechanic's classes recent compression experiment with an Instron machine. Specifically when plotting the data retrieved from the machine we see a non linear region before the...

The question: Suppose two identical particles, each with mass m and kinetic energy T, collide head-on. What is the kinetic energy of one in the rest system of the other? The solution: Is given on pg 109 of Griffiths' Introduction to Elementary Particles. Griffiths writes down the total...

Homework Statement For a lab, I have performed a completely inelastic collision using 2 masses. One mass is 0.583 kg, and the other is the unknown we have to find. Using an air table, I was given the dots to show the movements of the objects as they intersect and them move together. I have...

Homework Statement An unstable particle called the pion has a mean lifetime of 25ns in its own rest frame. A beam of of pions travels through the lab with a speed of 0.60c. a) what is the mean lifetime of the pions as measured in the lab frame? b) how far does a pion travel ( as measured...

Homework Statement 4) In order to determine the moment of inertia I of a rotating platform, a string is wrapped around a spool of radius r = 2.0 cm beneath the platform. The string is then fed over a pulley with a hanging mass attached to its end. The hanging mass is then released from...

I was wondering if anyone could recommend a good simulator to play around with. I'm a chem student and have always wanted my own lab, but having one is expensive and potentially dangerous considering I am still living at home. But i would like to play around with a simulator, preferably a free...

Okay so we have an impulse and momentum lab and I have to do the data analysis for my group. Usually I find the data analysis calculations a cathartic processes but I am totally stuck for this one. I am in a calc based physics lvl 1 course dealing in Newtonian mechanics. Anyway for the lab we...

So, I am a freshman signing up for classes next year. I have only taken Physics I - Mechanics, and I am done with Calc III, and I have the opportunity to take a lab course on quantum optics. I am obviously not very prepared, but I have been exposed to surface level quantum concepts quite a bit...

Hi, this is my first post. I'm generally more of a blog/message board reader than a contributor, but there's really been something that has been eating away at me, making it difficult for me sleep at night. (Note: long post coming up) Last semester in Organic Chemistry I, I made a huge...

Hi, this is my first post. I'm generally more of a blog/message board reader than a contributor, but there's really been something that has been eating away at me, making it difficult for me sleep at night. (Note: long post coming up) Last semester in Organic Chemistry I, I made a huge error...

Homework Statement Suppose we have done a conservation of momentum lab the smart pulley apparatus shown in the figure provided. With this apparatus we can time the motion of cart #1 very accurately. In the beginning cart #2 was stationary. We set cart #1 in motion by giving it a slight push...

I'm fortunate enough that I can choose between several labs and for my last choice I struggle between 2. I'm still an undergraduate student and the lab experiments aren't real research in the sense that I'm not supposed to discover anything new and they are meant for us to get experience in...

Homework Statement The length of DNA helix occupied by one nucleotide pair is 3.4 A (angstrom). A human has 10^14 cells and each human cell has about 6.4 x 10^9 nucleotide pairs of DNA. What is the length of double helix that could be formed from this amount of DNA in a human individual...

I have done a lab on resolution power of a telescope. a wire gauze was placed infront of sodium lamp and i used a telescope with adjustable vertical slit to look at it. i was bit confused with the theory .. 1) I was told to record the slit width when the vertical wires just cease to be seen...

I am currently a Physics-Math B.S. Major in my junior year of my undergrad work. I had an internship last summer and based off of my supervisor's non-response to my e-mails requesting to return, I didn't do so hot. I am taking a modern physics lab class right now and I understand the theory and...

Homework Statement In a physics lab experiment, a compressed spring launches a 40g metal ball at a 25 degree angle. Compressing the spring 17cm causes the ball to hit the floor 1.6m below the point at which it leaves the spring after traveling 5.3m horizontally. What is the spring constant...

Homework Statement Problem statement: We are measuring the flow rates of liquids of different viscosities through holes of varying sizes. We ultimately want to observe the relationship between the viscosity and the flow rate, and also between the diameter and the flow rate. Variables...

Homework Statement Determine the error in the calculated centripetal force, F (dynamic), for each value of r from the estimated error in the quantities m, r, and from the standard deviation from the mean of your three measurements of f. Derive the equation for the error using Rule # 2 for...