Lab Definition and 1000 Threads

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...

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...

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...

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...

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...

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...

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...

Hello, I am pretty nervous about working in a lab for a professor at my university this summer... I am currently in the second semester of physics introductory courses, and this professor completed his PhD at one of the best universities in the world... Does anyone have any advice about what I...

In my physics class for an assessment we designed our own lab. In our lab we had plastic cups and cut small holes in the bottom ranging from 0.3 cm to 1.3 cm diameters. We then measured the amount of time it took for different volumes of water, detergent, syrup and rubbing alcohol. I...

Physics lab normal force please help! A 1000-kg car moves at a maximum speed so that it does not skid off the 50-m radius level track. If the coefficient of static friction between the road and wheels is 0.80. What is the maximum speed? Assume that the gravitational constant is 10.0 N/kg =10.0...

I apologize in advance if some of my answers don't quite make sense. I'm generally articulate, but not when it comes to physics I'm barely grasping. I did a lab and part of it was dropping a magnet through a coil, which produced a Voltage vs Time graph using LabPro. For trial 1 we had the N...

Homework Statement I have 2 blocks. M1 is resting on a horizontal plane and attached to a string that goes over a pulley to M2. The plane is like an air hockey table to simulate very little friction. I attached spark tape to M1 so I could measure the time it took and distance traveled. Now...

Homework Statement "You are asked to do an experiment where you will need to use a rotating blade to measure the wind speed. You measure the number of rotations of the blade at 10 different wind speeds, 10 times each and will make a linear fit to determine the wind speed as a function of...

Need help calculating friction and normal force for "Measuring Friction" Lab Hey guys, I'm not great at physics and have a lot of work ahead of me so I could use some help. The lab setup is a wooden block sliding on a wooden surface. There is a weight attached to the block by a string that's...

Homework Statement Based on Volts and distance, calculate the max Electric Field between lines. Homework Equations The Attempt at a Solution We basically connected a 6Vdc battery to a plate containing two conductors and use a multimeter to plot the lines of flux of the field. To find...

Hi. I've been having problems finding some primary sources for my lab report for days. I've used my school's search engines, but I can't find anything appropriate to use. My report will sum up my experiment on how pH affects an enzyme's activity (catecholase catalyzing catechol and oxygen to...

Identify unkmown compound lab HELP! ok so i had to identify the unknown compound, which actually for me was Sodium carbonate. i don't know if i did this correctly because there was a lot of confusion with my lab partner (screwed me big time, couldn't even count drops; i will be getting a new...

Homework Statement We are to use the Ramp: Forces and Motion simulator located at http://phet.colorado.edu/en/simulation/ramp-forces-and-motion. First part we are to chose 2 objects. I chose the small crate and textbook and then slide then down a ramp at 30 degree angle. Using the...

Homework Statement So, our lab entails the students launching a projectile at a certain angle into a cup at a certain distance away. The launcher is 37 cm off of the ground and the cup is 7cm of the ground, so the Dy = 37-7 = 30cm. We will be given the angle in class and will be asked to...

So we did a lab in school on what is the effect of flour on slime which is mixed with borax and glue on the length it can be stretched. I have completed the experiment and found out it stretched much longer than the control variable with is normal slime without flour. I finish writing my...

Homework Statement Compute values for the electric field at four different points on the point-line plate. Comment on the validity of your values. Homework Equations E = F/q ΔV = ∫E dot ds The Attempt at a Solution I have attached 3 electric field maps that I did in the lab and...

Check my "Throw the Ball" lab. (2D kinematics, force, work) Here I have a lab, with explanation, questions and my worked out answers (tried to make it as neat as possible with all the formulas I use, lowercase letters are subscript letters). Can someone carefully check my math for all this? I...

I am trying to get the calculations and the data to match up in lab. The boiling point elevation predicted by the equation does not match up to the one I am getting by direct measurement. What am I doing wrong?

Do professors push most of their lab work onto graduate students and focus on grant proposals? How does the answer differ for assistant professors, associate professors, and full professors?

Ok so I have my AA in General Studies, Science Emphasis and I applied for and have scheduled an interview for a job entitled Science Lab Tech out at my local community college where I graduated. I know the interview will be with a commity and I have been told that I won't be able to fake any...

Homework Statement What should happen to the electrons in a insulated metal object when a negatively charged plastic rod is brought near the insulated metal The Attempt at a Solution I thought the electrons will repel each other and the insulated object will move away from the rod...