Lab Definition and 1000 Threads

< Mentor Note -- thread moved to HH from the technical engineering forums, so no HH Template is shown > Hi, I'm working on a lab project and I have limited instruments/electronics. I am trying to use this op amp to amplify a few uA pulse to a 5 mA pulse. The pulse is passing through a...

In class, we did a lab to determine the boiling point of rubbing alcohol. We used a thiele tube filled with water and place a test tube attached to a thermometer w/rubber band in it. However, we never saw any signs of boiling. We conducted several trials, the temperature went all the way above...

Apologies for the stupid questions but I have confused myself. I was separating out blood components in lab- column chromatography- and now we have to calculate Na+ content of each fraction collected (in μmoles) and the protein content of each fraction in mg. Each fraction was 1.5ml. The Na+...

Homework Statement I have the time and distance measurements. We shot it straight up, how can I find the altitude and angles? Times: (6.58 sec, 23 m), (6.90 sec, .6 m) (6.20 sec, 10 m). The time represents how long it takes for the rocket to shoot up and fall, the distance is the measurement...

I have just entered the 3rd year of a Physics degree and I am required to choose four experiments from the following for the practical laboratory. Ive had a decent look into subject area each experiment embodies but I feel I don't have a good jist of how they really are, and I know I don't...

Homework Statement The diagram shows the impact of 20 projectiles launched at the same speed and angle. What is the uncertainty in the impact position? (see attached file for picture of diagram) Homework Equations No equations, my lab instructor said through an email that I can get it "just by...

Homework Statement I need to find three potential reasons for my .5% error in a lab where I used the Archimedes Principle to measure the density of Iron. We only used a graduated cylinder full of water and an iron mass. I measured the water level from the meniscus. We used two different...

Okay, so here is the deal. This is my third week in Gen Chem 1, and my first two labs so far were an 88 and a 74 out of 100 pts each. I do not know why I am getting this low of a grade. I do the work and I am a good student. I am taking Calculus III and Calculus Physics ATM, so I am a pretty...

Homework Statement I have been investigating the Doppler effect in a circular motion with a stationary source and moving observer (however the main aim is to determine the speed of sound in the end). Using Vernier software - Logger Pro - I have obtained two graphs of the sound pressure against...

Homework Statement An electron moves to the right with a speed of 0.90c in the laboratory frame. A proton moves to the left with a speed of 0.77c relative to the electron. Using the Lorentz coordinate transformations, find the speed of the proton in the laboratory frame Homework Equations $$...

I'm doing a lab where we use three strings connected to a ring, with each string attached to separate spring scales. What would be sources of error in this? And how does friction affect my results?

Also is it better than doing research with professor in school? If you had to choose

Hi I am Ken. Nice to meet you. I would like to get some info on this synchronizing module. It has a 3 phase lamp for synchronizing an alternator. Any knows what's the theory behind that flashing lamp? what if the lamp blink very fast or blinking slow? the reason is frequency is out of phase but...

Homework Statement This is a magnetic force lab for the second semester of a physics lab course. The setup of the lab is as follows. A wire of length L hangs vertically between two contact points and has a mass with mass m attached to the bottom of it. The wire sits between two magnets in...

Hello. I have no experience as a cellular biologist nor have any lab experience or knowledge. However I would like to know how would one go about finding out what is needed in order to test the following foods mostly for human cells (any kind) : 1. How can I examine the following food items...

Homework Statement A block of 55 g is sliding down a ramp of 35 degrees of inclination. The hypotenuse of the ramp is 63 cm and the height is 36 cm. vi = 0 as the block starts at rest. Homework Equations vf = vi + a(t) d = vi*t + (a(t)^2)/2 kinetic energy = (mv^2)/2 The Attempt at a Solution...

Hey folks, I'm looking for a high school laboratory to introduce students to induction. I've searched the usual suspects...Google, YouTube, etc...but nothing has really jumped out. I've ordered some toroids so students can compare the strength of magnetic fields in air versus ferrite, and I'll...

Dear everyone... I am trying to set up a RF lab at home to help me do DSP projects with very low frequency, as low as possible. Anyone who has experiences about RF lab, please give me some ideals and what machines from basic to advance will be needed for the lab? Thank you, Nate Duong.

I have one question which I need to verify as a thought. Suppose I have a particle collider for symmetric energies e^\pm, that give as a result the Y(4S) resonance which later decays in B mesons. Then the lab-frame is equivalent to the rest frame of the e^\pm system and the Y(4S) is at rest in...

ZapperZ submitted a new PF Insights post Research Work and The Lab Book Continue reading the Original PF Insights Post.

I am going to be a college freshmen majoring in physics and am trying to learn about all of the different options I have in the future. I can't seem to find any good information about what government research jobs in physics are like. What does a day look like as a government researcher? Are...

What materials and equipment would be needed to for a hobbyist photoelectric effect lab kit? If possible, trying to keep this within a budget of $50. (Cheaper if feasible).

I need some ideas for an assignment in Physics: I am to determine an experimental protcol which will allow me to determine if statistical differences occur in the data that I will collect. I am collecting data to find the reaction time of two subjects. For example, one student a few years ago...

I had mentioned in another thread that I had just started teaching Physics. I had spoken about the qualities of a Physics teacher and the challenges he/she may face but something I left out was "The Lab". This was something that was a thorn in my side right from the start going back to when I...

I'm currently still in high school (no rush!) and am thinking about my future. Physics interests me, and I was wondering how far one would have to get on the step-ladder or titles to be qualified for a research or lab position as my job. I'd like to do what scientists did back then, but I'm not...

Homework Statement Here is the lab overview: In this experiment standing waves are produced in a string using a vibrator of variable frequency. The vibrator is placed under one end of the string which is tied to a rod and the other end of the string passes over a pulley and holds a suspended...

Homework Statement Hi everyone. I'm teaching introductory chemistry this semester, but I don't have much of a chem background. We are about to start acid base titrations. Does the standard solution of known concentration go in the buret tube or the erlenmeyer flask? Does it matter? Homework...

Hi, Id like to measure inrush current for various salvaged transformers (unknown windings, but probably 120/24) to the nearest 10 mA. I only have a simple DMM and soundcard scope. It seems that a clamp meter has this capability; if a clamp meter is the best approach, can I construct my own...

I recently had a lab in physics class that I was a little confused about. I posted a picture of a couple parts of the lab including the instructions and a couple of questions. I also highlighted a few things that confused me. In the instructions it said that all objects vibrate at a set of...

Homework Statement So I am doing a mini-lab and I measured the temperature of water before heating it up and after. I determined delta T or the temperature gain to be https://www.physicsforums.com/file:///C:/Users/BADGER~1/AppData/Local/Temp/msohtmlclip1/07/clip_image002.gif...

I understand that connections, research record will play a major role in landing an interview for a national lab job, even for a staff scientist position, and I wouldn't be opposed to working in a national lab after graduation (and any appropriate postdocs). However, that is not my question. As...

Homework Statement [/B] Known weight: 0.2 kg Center of gravity: 0.501 m Other found data is in the drawing I made below Homework Equations [/B] T=Fl 3. The attempt at the lab

The lab called on us to use a vacuum tube to determine an electron's charge to mass ratio. Here is a link to the lab: http://www.clemson.edu/ces/phoenix/labs/cupol/eoverm/index.html. What are some sources of error in this lab? I already know that human error and error in measurement can skew...

Do you have a home lab? What does your lab consist of? My lab mostly consists of electronics tools like an oscilloscope, function generator, various power supplies, meters, and so forth.

1. T^2 = (4 pi^2 m)/k * d^2 + (4 pi^2 I)/k y = m * x + c Information (4 pi^2 m)/k = m (gradient) (4 pi^2 I)/k = c (the y intercept ) A graph of T^2 vs d^2 was plotted. (^2) means squared Find constants k and I How is this done since the m in the...

Hi. I'm joining this forum to ask about some equipment I need. At the community college where I teach, we do a lab in freshman physics where students measure the input to and output from a transformer. My AC sources are reaching the end of their lives, so I'm looking for replacements. As far...

Hello, Last week our group did a project to see out of carbs, protein, and lipid which one produces the more carbon dioxide, and we were unsuccessful. Here is what we did: 4 test tubes 1 tube was control (4ml yeast and 10ml water) second tube (4ml yeast; 5ml water; 5ml lipid) third tube (4ml...

Homework Statement Question: A car goes down a ramp, and once it hits the floor it must travel 6 metres and then stop. Create the procedure in order to find the angle that the board must be to make this scenerio possible. You cannot test on both the floor and the board at the same time...

I am meeting a professor this week to see if I can work in his lab. His area of research is magnetism. In a preliminary meeting, he told me that the 'ambient' magnetic field in the lab is about twice the magnetic field of the earth. I spent about 10 minutes in the lab. There was a machine with...

Hello I will defend in a couple of weeks and I have been asked to do experiments that are not directly adding to my thesis (I can force it and add If I wanted but not really critical). Normally PhD candidates in the final stage are given a time to work on their PhD thesis and in my situation...

Hello everyone, I am working with my modern physics professor Dr. Parshar to make a pulse laser for my modern physics lab. I have to make an itemized expense report for the materials and all that. I need help figuring out what crystal or doped glass would be best to use, not super expensive...

My question is : What is the absolute capacitance?In my electricity lab, I was assigned to prepare a report on measuring absolute capacitance of a capacitor using ballistic galvanometer. I am familiar to the term self capacitance but not the absolute one. My mentor asked me to find it out by...

Mentor's Note: This post and another have been merged at the member's request in order to attach their results. 1. Homework Statement See the attached picture for the lab setup. It is all about releasing a cart of 1.212 kg attached with a string and hanging masses. I recorded the Initial and...

I am struggling with doing calculations for a physics lab report. I understand how to calculate the equivalent resistance and the voltage of the battery. I am struggling with calculating the resistance of each resistor and the current of each resistor. I am sorry but I am getting very...

I feel as though my ability to properly write up lab books when I do/after I do experiments is really weak. I struggle to analyse the data in a meaningful way. I don't know how to/when to calculate errors properly. I'm near useless when it comes to logarithmic graphs, or inferring any important...

Homework Statement a projectile is launched at an angle of 26.5 above the horizontal at a height of 1.11m. the range is 2.331m. find the initial velocity and time given that acceleration due to gravity is 9.8m/s^2. The Attempt at a Solution first, I split the velocity into its components...

Homework Statement So I am doing a trajectory lab. I take a ball and release it from the ramp that is on the table and then measure the distance. The thing is when I graph the angle of the ramp vs the distance the ball has fallen I get parabola. And the correlation of parabola is 0 Homework...

I asked Mr. Randall about sig figs for this lab, especially on instruments like the vernier caliper and micrometer. This was his answer: "For lengths smaller than 1 cm, you should get at least 2 sigs: 0.??. (To the 100th place, 0.01.) Between 1 cm and 9.99 cm, you should get 3: ?.?? The...

Hi everyone, I have trouble with labs in general; it was the hardest part of organic chem for me, but I did get better through bio and the last quarter of physics. Still, my "better" is not great, and I always do better in the lecture section of the class. I'm taking a 3-quarter introductory...

Hi everyone, I graduated in May of 2014 with a BS in Astrophysics and just landed a job with a major university as a physics lab assistant. As part of the position I will give a 15-20 minute lecture to undergrad students regarding what they are doing in the lab that day. I have no experience...