What is Lab: Definition and 1000 Discussions

Homework Statement In my lab we where given a simple circuit and told to get some data of a capacitor charging and discharging. Thus I now have a graph of current vs time, we used semi-log paper for this so the graph would be a straight line. We are given the value of the resistor and...

A wooden block is clamped at one end so that it projects horizontally from the clamp. A mass is suspended from the block causing it to bend. Investigate one factor that affects the amount of bending. I have to 1. Find a research Question 2. Find a Hypothesis 3. Identify dependant...

Greetings All, I am a PhD student in a physical chemistry department. Our research group would like to build our own high termperature ovens for preparing samples. Nothing fancy, just a controlled rise in temperature to a given setpoint, hold it there for a designated amount of time and the...

Homework Statement Action of lipase and bile on milk (Lab) (Biochemistry) Homework Equations None The Attempt at a Solution I can't find information on this lab anywhere! My teacher isn't helping much, so I was hoping for any help whatsoever. Thanks! It's a planning lab - I need...

Every now and then I entertain this thought. The more i study the sciences the more i want to continue studying. I've spent hundreds of dollars on books ranging from physics to mathematics to organic and biochemistry to electronics, I bought Kent's Mechnicals Engineer's Handbook today(mainly...

Homework Statement Well i have a lab practical due for physics and I am having trouble with it. we have to assemble a tri level mobile. that wasn't that hard. the difficult part is doing the math to support my answers. i need to use translational and rotational equilibrium. i looked...

Hi Everyone! I'm a grade 12 physics student and we conducted a momentum lab. On a frictionless surface, we conducted a simple 2D collision and using the data gathered from that, we had to calculated the momemtums and indicate what type of collision had taken place... that was all fine and done...

Homework Statement well this is just a over all question. I am currently taking the AP b and recently i did this lab on collision. there were 3 collisions, a) one stationary while another one hits it b) both masses crash into each other c) both has velocity but one has higher velocity to...

Homework Statement Hi, I've been doing some relativity past paper questions and I totally got stuck on 2 of them. Both regarding an elastic collision of 2 electrons at relativistic speeds. First question: I am to show that it is true that the total energy of the electron which is in motion...

Homework Statement Okay so we did this lab at school a few days ago where we had a cart and pulleys with different amounts of weights. They used photogates. By doing this we got the acceleration of the cart (measured). I figured the "accelerative force of falling mass" by using the f=ma...

Hi! I have the following problem: Example: collision of 2 electrons For non-relativistic scattering it is easy to show that the speed of the CM frame with respect to the lab frame is equal to the speed of the electrons in the CM frame, expoloiting the fact that in the lab frame, one of the...

Hi I hope I'm posting this in the right section. I am trying to find some experiments that would be appropriate for an introductory biophysics course for some second year students. Any links/pointers in the right direction would be great, although I'm specifically looking for enzyme/molecular...

1. if two projectiles have the same range must they ahve the same intial speed? 2. if the maximum altitudes of two projectiles are the same, must they have the same intial speed? 3. if two projectiles have the same range must they have the same time of flight? 4. two people are standing...

Before I describe the problem, I would like to apologize for my lack of comprehension of this subject. It is the first semester of Physics, but the end, and has become quite complicated. Homework Statement There is a 2.0 L soda bottle used, with a hole a certain height (hhole) from the...

Homework Statement The Michelson interferometer can be used to measure extremely small distance scales. What is the smallest distance scale that can be measured? What uncertainty is associated with this? What is the smallest scale that can be measured by the Fabry-Perot...

Hi all, so... now that I have to write lab reports at uni level, I'm starting to wonder what software would be best suited for the task. Currently, my workflow goes like this: iWork Pages (or MS Word) for the actual report. imported LaTeX (or Mathematica) PDFs for mathematical equations...

This may be a bit of a silly question, but I'm wondering if it is feasible to design a freshman level lab experiment using a STM? For example, let's say the lab is simply intended to give the students a better appreciation of how a STM operates within the framework of quantum mechanics, with the...

Homework Statement This is a lab, I think I want to find if momentum is conserved after collision (data for proof). Homework Equations Change Y = Vit + .5at^2 M1V1=M2V2 The Attempt at a Solution I found that time is equal to 0.515 seconds from using that equation. -1.3M = 0 +...

For the simple pendulum lab, I have to find the percent difference between my theoretical and experimental velocity. I found out my theoretical velocity as I used the conservation of energy to generate an equation for v, but I'm having a hard time calculating my velocity from my experimental...

Homework Statement This is a second year physics lab on diffraction and interfererence. The theory is not given in the lab manual, and unfortuneately, all of the references they list are unavailable at the library. So, I need some hep recalling a few equation that I am going to need. I am...

Sorry if this is posted in the wrong area, I am relatively new. Circular Motion Lab is set up like this to study circular motion...

Homework Statement K, I've been sick from school for 2 weeks and now that I am back, my teacher Wont help me, thinking i was skipping because I'm not one of his best students -.- anyways, he gave me this lab and i have no clue what to do. I've read the unit in the textbook but these...

What is the relationship between the mass and velocity of a whirling object? base of graph relationship What is the relationship between the radius of revolution and the velocity of a whirling object? What is the relationship between the velocity of a whirling object and the centripetal...

I need to find the variable m in the following equation rate=k(acetone)m(I2)n(H+)p Here is our expirmental data Exp. 1 10 ml of 4 M acetone + 10 ml of 1 M HCl + 10 ml 0.005 M I2 reacted in 68 sec. Exp. 2 20 ml of 4 M acetone + 10 ml of 1 M HCl + 10 ml 0.005 M I2 reacted in 27.6...

I did a Hooke's Law lab in class last week and one of the post-experiment questions asks to explain why the graph made should be a straight line and what should the slope and y-intercept be in terms of quantities in this lab? I know that Hooke's Law demonstrates that the amount a spring is...

Homework Statement Purpose: Determine the mass of a meter stick without directly measuring it. Possible Materials: Select the appropriate materials you will use. __ Meter Stick __ Thermometer __ Stop watch __ Washers __ Knife edge __ Plastic ruler __ Known Masses...

ok i am doing my lab report ow, and i am compeltely lost with some of these questions. it was a titration neutralization lab can get some help? 1- why is it necessary to dissolve the khp in water? 2- why is necessary to swirl the flask during the titration? i think the second one is so...

Homework Statement Please calculate the units for the spring constant k in two fashions. First, from Hooke’s Law (eqn. 5 in lab manual), and then from the period equation for a spring (eqn. 3). Please show that these units are compatible (i.e. mean the same thing).Homework Equations...

i am pretty confused on this. i am currently acing my chemistry test, with minimal effort. The chemistry class also has a lab component to it. I am lucky, that i have a smart partner that i can copy her answers from because i am COMPLETELY LOST in the labs. Its like i have ZERO idea whatsoever...

1. Dropped a .057kg tennis ball and .0027 kg pingpong ball (the pingpong ball is resting directing on top of the tennis ball) from .5 m. Measure the height of the pingpong ball's rebound. PPm = .0027 kg TBm = .057 kg PPwidth = .04 m TBwidth .065 m Drop Height: PP = .565 m TB = .5...

After performing crystallization and melting point determination I determined that my unknown solid was phthalic acid, however I am left with the question: At the end of the filtration of the purified solid, it was observed that a small quantity of fine colourless particles was contained in the...

Chloroform is used to extract caffeine from water.If the distribution coefficient, KD=10.What relative volume of chloroform-water should be used to extract 90% of the caffeine present in one single extraction? Now i know that KD=Co/Cw and I've solved a question on how much weight of an acid...

Hi, I need to plot a graph of F=kx for my lab report. By measuring x, displacement of spring for every mass (20g, 40g,50g) we found k. Now i need to draw F-x graph. I put my F and x data on graph w/o any problems. But when it comes to draw the line of F=kx i get stuck. Using the line's...

Reaction Lab (NEED HELP!) 1. This is a clock reaction lab where you have 10mL of KIO3 solution in a beaker, and you are adding 10mL of NaHSO3 solution to it. You then start the stopwatch and wait until the solution turns blue. I need to calculate the initial concentrations of KIO3 in each of...

Homework Statement I am writing a formal lab lab report. I have trouble with Appendix section. I am going to put raw dat and sample calculation. And my question is, do I have to number them? For example, APPENDIX 1. raw date(chart) blah, blah blah... 2. sample calculation of...

Homework Statement I know that the light wave must travel 17.3 km or 17300 meters. I found experimentally that the frequency should be 2200 Hz. I picked it from a pool ranging from 0 Hz to 5600 Hz. The goal was to see what frequency was required to get the light to pass correctly through a...

I have the problem attached to this. Any help would be AMAZING. I just don't know what to do for this problem. Thanks in advance!

Hello all, We did a titration lab today. We used Ca(OH)2 in a burret and titrated a 10mL solution of vinegar. The solution of Vinegar was mixed with water, in a 1:20 ratio(inside a flask). So for every 10mL of solution there was 0.5mL of pure vinegar. We used phenothalen as the indicator...

Okay so I did a lab on Linear Motion using the glider with the air track and a spacer. This is the information I have about the glider and spacer. glider mass = (468.7 +/- 0.02) g thickness of spacer =(14.8 +/-0.05) mm I'm stuck on doing the error analysis and I don't know how to go on...

Homework Statement How would doing this experiment in the moom effect the experiment ? "the experiment in lunching a ball against a pendulum and making an inelastic collision find the kenitic engergy and the inital velocity" Homework Equations I found all the answers and I assume the...

Homework Statement We recently did a momentum lab in my AP Physics B class that involved a track with two carts. 1 of the carts was stationary on the track and the other was launched into it. We used sonar detectors at both ends of the tracks to find the velocity (and eventually calculate...

Homework Statement This will be kind of long because it's not just a simple problem, it's a lab. Sorry about that. So the lab is testing the concepts of forces and centripetal force, for starters. We are supposed to be "investigating the relationship between period and acceleration." In class...

Homework Statement So this isn't necessairly a direct problem, but we are currently doing a momentum lab in my AP Physics B course and the lab is basically dealing with 4 cases of collision between two carts. In all cases we are to measure the velocity just before collision of the two carts...

I recently came across this article: http://www.newscientist.com/article/dn14094-bacteria-make-major-evolutionary-shift-in-the-lab.html Has anything on this scale ever been observed before? Lenski's freezer must be an immensely valuable source of evolutionary information. And one question, why...

Homework Statement In this experiment, we used an apparatus that had a shaft that could be rotated with a bob attached. The bob was connected by a string and a spring to the shaft. The shaft was rotated so that the bob would be moving at a fixed distance away from the shaft. This fixed...

Homework Statement http://img245.imageshack.us/img245/7259/12214351.jpg Homework Equations The Attempt at a Solution I have no idea, the previous lab i put gravity depend on location, but the teacher marked me wrong If anyone can give me some hints, and i need 3... I don't...

This is my first post to this forum! I'm working on a Lab write up for introductory physics involving projectile motion and velocity. For the experiment we threw a ball such that its motion was as close to parabolic as possible. A video was taken and using a video analysis program we were...

Homework Statement Hi, I'm new the PF and I was wondering if someone could help me with my lab. This was the basic set up of our lab, with one mass being pulled by another mass up an incline. The ramp was placed on a desk while mass B was left to fall towards the ground. What we were...

Homework Statement In class, we conducted a lab experiment in which we placed an object on the end of a piece of wood and lifted the same end of the wood until the object slid down to the bottom. We measured the height the wood was lifted to. (to assist in calculating Coefficient of Friction...

Homework Statement http://apcentral.collegeboard.com/apc/public/repository/ap05_phys_laboneerror_47485.pdf The above link is an updated version of the lab that I'm currently typing up. I have already gathered all data necessary: Time taken to travel 50 meters: @ 1.089 degree downward...