Physics
For Physics Discussions
1,008 topics in this forum
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I have the TI-Nspire™ with Touchpad GDC. It seems to be a great calculator with a nice UI. My question is: does it have preset constants (planck's constant, electron rest mass, etc.)? I know the TI84 does but I'm not sure about this one? If it does, how would I access it? Thanks,
Last reply by MoneyWinker, -
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I am an IB Physics student and would like to ask those of you physics gurus out there if you would be able to help me by offering online physics tuition on skype or something, that would be great. Maybe you could ask your CAS coordinator for CAS hours or something but I need help please
Last reply by jayrobsah, -
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hi i did an experiment about electrical current in water depending on the amount of ions for the g4p in physics. for each water the intensity/voltage relation was proportional, but the graph never started at 0,0 but was shifted right by different values. my teachers says this is no energy dissipation in the circuit or sth like that, but the nature of the process. he gave me hints, to start looking at recombination of ions and potential barrier, but I could not find any explanation. any help is very welcome
Last reply by dessskris, -
Ok so im about to start physics SL. And i just need to know from anyone, is it really hard. Because i did chemistry and i had a hard time with that subject, like do the two subjects have anything in common? If so i need to change to bio. SO yeah i just need some opinons, and i want to be a lawyer so do i really need physcis? Thank you for replies!
Last reply by nametaken, -
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Hello guys, i need with this homework that our physics teacher gave us, i just need these two solved, and i can do the rest on my own: s = ut + (at2)/2 Constants: u and a. Z = (R2+w2L2)1/2 Constants: R and L Thanks in advance!!
Last reply by Keel, -
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I really need to get a complete on evaluation, but my teacher says I have to redo it... are there any tips/guidelines how to write up evaluation? I've used the marking scheme guidelines, but I need some more tips
Last reply by Keel, -
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Hey guys, I'm not quite sure if there's already a thread on this...if there is, please feel free to close this. As the title says, how is everyone studying for physics?
Last reply by darkwatch218, -
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I'm doing my IA for Physics. And we're going about Force, and as one of the improvements I want to put that I'd used more advanced equipment to measure the force (I did it through using the weight it made and using the equation F=mg) but I have NO idea what types of equipment I could use that aren't just a Newtonmeter?! Please help!! xo
Last reply by Rigel, -
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I have spent my first semester in IB, done a couple of labs, but I haven't figured the perfect formula to get high marks in labs. My best two DCP labs scored 6 and 5, and two 5s for my CE labs. I did one design lab recently and I got a three. I have read the requirements and the mark scheme, but there is always something to pick on in my labs. I have talked to my teacher , but ugh, I am still confused. I really want those 6s... How to improve? Any help is appreciated BTW, what do you guys write for the evaluation of a lab? Sometimes I couldn't find any possible improvements in the lab... and thats usually why I don't get a six in my CE labs.
Last reply by Keel, -
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I just want to know because I'm writing my Physics lab report. Thanks, appreciate any help on this brief question!
Last reply by Mahuta ♥, -
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I have to have a topic picked for a research paper in physics this week and I can't choose one. I dont want to do anything to complex or difficult but I also still want to sound smart
Last reply by fan, -
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Hi, I have two questions 1.- So I am wondering if there is a way by which the uncertainty is equal to the absolute error? 2.- During a lab report, in which I measured the lenght of a piece of wire, surprisingly all of my classmates and I registered 1.67 m exactly! (with a flexometer) Would it be wrong if I wrote in my report no absolute error? X_X
Last reply by Bob, -
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Ok so I am assigned with a design lab and the only requirement is that it should be related to heat capacity. I would say I have understood everything needed for thermal physics (I am doing SL) but I am stuck with no idea where to go... I have heard that a good physics lab should have 'qualitative data'; like you can establish a relationship from a series of numeric data; but it seems that the only possibility is a 'quantitative' lab about heat capacity - the heat capacity/ heat loss of different materials, etc. I just need an idea and I think I am alright; I need one that is easy to write and carry out... argh this is really a hassle to me, I am not a very creative perso…
Last reply by Bob, -
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I need to do a design lab on "Investigating the stickiness of blu tac." Ideas PLEASE! Thanks
Last reply by praachi, -
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Hello everyone! My science fair project is going to be about looking at the relationship between power (or energy) running through a coil of copper wire and the heat dissipated or the rate of temperature increase. I realize that it is important to factor in the effects of the air temperature on the coil, the air is constantly taking thermal energy away from the copper wire. The rate at which thermal energy is transfered from the coil to the air is proportional to how hot the coil is right? I know it's not linear. Are there any equations that exist to predict the magnitude of the heat loss that the air causes? Is there any way to find that with the information I have? (…
Last reply by Social_life>IB, -
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Hi, I was given a Physics IA, but I was absent the day the teacher introduced it, so I don't realy know what I'm doing. Are there any standard IA's? The idea was that we make apendulum and change the lengths and measure the time it takes the pendulum to complete one swing. And then something about the period. Does anyone know what I should be investigating? Thanks!
Last reply by fan, -
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My Science teacher disapproved the experiment my group had because it was too related to chemistry. This was kind of an asinine move on his part, since all the other teachers in the school allow science fair projects from other sciences, and we assumed he was the same. Now apparently, our title is due tomorrow. I don't really have an idea, but one thing I thought about was maybe an experiment that disproves that gravity is constant? I don't know how to do that, though, but I came up with a cheesy title for it. Are there any other ideas?
Last reply by EccentricPianist, -
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What graphing software do you use on labs? Our teacher wants us to use Graph 4.3 but I find it too finicky. I guess I can't really complain because it is free but I just wanted to know what the alternatives are.
Last reply by fan, -
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i just don't get anything. I am having serious problems with atomic and nuclear physics. Maybe it's because i have a lousy teacher but whatever. The only thing that i know is the definition of half-life hahahahahahahahah please help with everything...
Last reply by fan, -
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Hey guys, I have a problem with the design lab report which I was assigned for Physics SL. The assignment is to design a lab which "tests changes in internal resistance of a battery in different circumstances". I asked the teacher and she said it could be both internal (within the circuit) and external factors. I basically could only think about an external temperature as being the dependent variable, which would be relatively easy to control as well (using a fridge/oven). Could you guys point me in the direction of any internal factors which would change the internal resistance of a battery? Much appreciated :-)
Last reply by genepeer, -
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At the very core, a tap changes the volume of water getting out per second (let's call that vps) and I used to think it does this by changing the size of a hole. However, it occurred to me that changing size of the hole wouldn't change the vps. Making the hole smaller will make the water come out faster and the two effects will cancel out each other, leaving vps the same. So how does it do it? Never mind that question, if you were to design your own tap, how would you make it do it? I'm still thinking of it; will post a solution if I get one. Googling how taps work will only limit your creativity; do it at your own risk. PS: Or maybe my reasoning is wrong, and the tap sim…
Last reply by genepeer, -
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I'm considering doing physics HL in Year 12 (our school only divide physics SL/HL in IB2) and would like to take SAT II subject test for physics sometimes towards the end of Year 12. Having discussed it with my teacher he pointed out a number of topics in the subject test that are not covered by the syllabus. If any of you have taken the physics SAT based on what you've learned in the IB course, could you tell me if the 'untaught' part is significant and whether it's difficult having only studied the IB course? Any comments would be appreciated!
Last reply by genepeer, -
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I have to design an experiment to investigate how the amount of current flowing across a conducting wire affects length of the wire. Can any one suggest me appropriate design of the circuit in order to record relevant data with uncertainties to test the hypothesis. And please tell me how to measure the minute change in the length of the wire accurately as well.
Last reply by Drake Glau, -
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I did a lab and now i'm doing an IA on it. I had an inclined plane from which i realeased a ball from different heights and a ball b, at rest, on a plane surface after the incline. once they collide ball b moves and a continues moving in the same direction with a slower speed. This is elastic collision right? If so i could use my velocity values to show that they add up to the initial velocity of ball A. I really need help on developing a IA title on this one!! please please
Last reply by JavierG, -
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I learned somewhat recently that AP Physics C is different from IB Physics HL. Does anyone know what specifically is exclusive to AP Physics C?
Last reply by Mahuta ♥, -
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Ok, I'm new to this website and I'm slightly confused as to what the correct answer would be to the question. I'm not brilliant at physics, so I have no idea why I took it at higher level besides my admiration for the subject. Here is the question: A transformer cannot be used to run a 230 V, 100W mains lamp directly from a 12 V car battery. Which one of the following is the correct reason for this? a) The internal resistance of the battery will not allow enough current in the primary coil. b) Any currents in the iron core will heat up the iron core. c) The current from the battery will produce a steady flux in the secondary coil. Can you please help me understand the…
Last reply by genepeer, -
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What mass of carbon dioxide is required to fill a tank of volume 12.0 L at a temperature of 20.0 C degrees and a pressure of 4.00 atm? The answer is 87.9g First I have to get n (moles) and I have done that, but I dont know what to do next... noob help please ! Test tomorrow
Last reply by IB-Adam, -
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can anyone explain what dalton's law of partial pressure is? my textbook is doing a pretty crappy job of it and i have a test tomorrow.... in simple terms please.
Last reply by Mahuta ♥, -
Lab Report Ideas for an IA topic?
by Guest- 4 replies
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I'm going to do another IA soon. Can anyone suggest titles? It's going to be on Topic 5 - electricity.
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Hello all! For science fair this year I might be do something about electronics, maybe about how much energy is lost across electrical wiring because of resistance in the form of heat. I read this on a website: "Power rating When current flows through a resistance, electrical energy is converted into heat. This is obvious in an electric torch where the lamp filament heats up and glows white hot, see Chapter 1. Although the result may be less evident or imperceptible, exactly the same process of energy conversion goes on when current flows through any electronic component. The power output of a lamp, resistor, or other component, is defined as the rate of change of electri…
Last reply by Drake Glau, -
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I do not know why if it is the work done, yes when the pressure is constant, the work done is greater than that when the volume is constant, because δW = P δV when V is constant, δV would be zero. thus the work done is zero and when P is constant, the work done would be greater. but then the specific heat capacity...? c = Q / m ΔT it has got nothing to do with P and V. I do not know why then :/ can anybody tell me which is greater and explain why? thank you!
Last reply by genepeer, -
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Hey, I have a Design due next week and I really want to make it a good one so that this can be an option for me to send in next May! I did an experiment in class where I used an Energy Track (which is basically an inclined plane with marks at different heights). I released a ball A from different heights and placed a ball B at a marked spot at the end of the track. I then used a light gate to find the velocity of the ball B. In the end I had the following information: - I had 6 different sets of initial velocities, u1, for ball A (having released it from 6 different heights) - I have initial velocity for ball B, v1, which is 0 in all cases as it was at rest - I have 6 dif…
Last reply by brastu, -
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A problem from my Physics book, written by stupid Tsokos. A helicopter rotor whose length is R = 5.0 m. pushes air downwards with a speed v. Assuming that the density of air is constant at p = 1.20 kg m ^ -3 and the mass of the helicopter is 1200kg, find v. You may assume that the rotor forces the air in a circle of radius R (spanned by the rotor) to move with the downward v. Answer: The momentum of the air under the rotor is mv, where m is the mass of air in a circle of radius 5.0m In time (change in time), the mass is enclosed in a cylinder of radius R and height v * (change in time). Thus, the momentum of this is p * 3.14 * R^2 * v^2 * (change in time), and its …
Last reply by IB-Adam, -
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I am in 11th grade and I have took IB HL Physics in the beginning and then dropped down to SL since i found HL too hard. How much different is SL from HL? I have been an A student throughout highschool, but i am worried i will do really bad in Physics since everyone says its a very hard subject and i myself find it quite challenging.
Last reply by IB-Adam, -
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So I'm doing my first "IB" lab in IB Physics SL. This is the one that might get sent to IB and is part of the IB requirements. I'm doing "Mass applied to a cart vs. how long it takes the cart to roll down a ramp". I need help. There are a few steps I'm confused about like how to figure out a math model etc. I know this is broad but is there anyone out there who I can ask some questions to and knows a lot about this? thanks:) -Nick
Last reply by Drake Glau, -
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Hey IB people. If anybody has it, and could give it to me would be awesome. I would be really thankfull cus it would be great for a study help for my exam coming in november!! Thanks!!
Last reply by Brunoaldo, -
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Hello! I am just beginning Physics 11 IB. I am having a bit of trouble with a question. Perhaps the answers in the back of my book are wrong (as they tend to be sometimes.) For those of you who have it, it is "Physics for the IB Diploma" by K. A. Tsokos. Page 86, #24. Two bodies are joined by a string and are pulled up an inclined plane that makes an angle of 30 degrees to the horizontal. So it is an inclined plane. At the bottom is a 8.0kg body, then a string connecting it to a 4.0kg body, and there is a force F on the 4.0kg body, all at an angle of 30 degrees. Calculate the tension of the string when: a.) the bodies move with constant speed That is easy. The tension i…
Last reply by The Fish, -
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Actually i am having problem with my physics lab papers. Its not that I do not have idea but when i stare the assessment criteria then i get puzzled whether just to complete those criterion or include other aspect as well. for instance i have got the lab paper To determine the Young Modulus, E of loaded wooden ruler with Data Collection and Process and Conclusion and Evaluation assessment criteria. Do i need to include theory or not? !!!!! and i am having problem to plot graph with error bars? Do you know any software that gonna help me?
Last reply by larry, -
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We did this series of experiments where we manipulated Pressure, Volume, and Temperature. Each of the three experiments had one of those variables constant. So now we have to do a lab on it and no one knows what to do. Our teacher said to make 9 graphs, each combo of the three variables in each experiment, and continue the line to zero Kelvins. But that doesn't really make sense to me. Wouldn't someof those just be straight lines? Wouldn't a bunch of them not pass through 0? How can you extrapolate when it's so far away from the trials you did? I asked all my friends and all I got were mixed, uncertain, and contradictory answers.
Last reply by Grumps, -
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The homes in Cyprus produce hot water by making use of solar heating. Design a lab where you would test one variable that would affect the power output of the solar heaters. Be sure to include all the details of how you would male any measurements and how you would keep your control variables constant.
Last reply by Mahuta ♥, -
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hello, in a scale where 1 is the easiest and 10 the most difficult where you would put standard level physics and where higher level physics
Last reply by Daedalus, -
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Hello fellow ibers! I have a problem with one of my physics lab on circuits. I'm trying to find the relationship between an ohmic resistance and a non ohmic resistance in a series circuit. When I make the graph relating these two variables, I find out that the absolute uncertainties are too small and the error bars don't show... I was wondering if I could just omit this in the graph (justifying later why I did so), would that take me a lot of point from DCP? Thanks!
Last reply by Tilia, -
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Okay so here's my problem. What we did for our investigation was we got a cart with two of those weight things: http://www.thesciencefair.com/Merchant2/graphics/00000001/SltdWtSt90-1_M.jpg Okay now we basically had a piece of string attached from the end of the cart to another weight(the empty holder things from above). This was hanging over the desk. We let that weight go and the cart accelerated. We then changed the amount of weight on the end(which we were dropping), taking care to keep the total mass of the body constant. We did this by taking one of the small round weights(which weigh 50g) and taking that off the cart and putting it on the end weight. Here are some n…
Last reply by timtamboy63, -
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Hey, so I have to choose if i want to take higher or standard level physics. If I take SL then i have to do Geo HL, but if I take Hl i can do Chem SL, which is what i want to do, because i find it very interesting compared to geography which is very boring. Problem is, I don't know if it's worth taking physics HL, i've heard from many that it is very difficult and not advised to take. I'm not such an ambitious student, although if I like a subject more i do tend to spend more time on it. So, what do you think? Physics HL with Chem Sl or Physics SL with Geography HL I'll be happy to tell you that I decided on taking Physics HL, which I'm happy with and don't regret (so far…
Last reply by AlonsoDT, -
Hi guys!, How hard is it to get a 4 in Physics-score compared to get a 6?
Last reply by IB-Adam, -
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Hi guys My name is Adam and I'm an IB 12. Before my class left for summer break, we had 3 weeks of physics SL under our belts with our teacher Mr.C. When we returned just last week, we found out that she had left, and an untrained physics teacher would be taking her place. So far, we have had 4 days of school, and the most we've done is talk about "What is science?" in general. This is obviously frustrating, seeing as how our exams come up so fast. We tried to tell the teacher that we would like to start covering the things that we will be tested on, but he just dismisses us. I was wondering if anyone has any tips as to how my class can prepare for the exam without him, …
Last reply by Adam R, -
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hi guys !! Can anyone explain me the importance of surface area to volume ratio in biology?? My teacher always gets away with explaing because she doesnt know herself. Its so funny but in result i dont understand biology (
Last reply by Cynthia, -
Hi, I did this photosynthesis lab where I investigated how does the color of light, i.e. the wavelength, affect the rate of photosynthesis. I used spinach leaf disks and I infiltrated them with sodium bicarbonate solution so that they sank. As they photosynthesized, oxygen bubbles were formed, and the leaf disks finally floated. So I have this raw data of time in minutes and the number of leaf disks floating in each of the five beakers that received different colors of light (blue, red, yellow, green, clear). How can I process this data and show some relationships? Thanks in advance.
Last reply by Sandwich, -
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Hi everyone! I've been studying Physics SL and now I'm solving some past papers. In a question about waves they talked about standing waves. I searched in the Physics Guide and I didn't find anything about those. Are they out of the syllabus?
Last reply by Tilia, -
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So we got a lab to do ourselves over the winter break, and the instructions we got (as usual) were super ambiguous. But considering we haven't touched upon thermal physics that much, I was hoping I could get some help from you guys (: This is the assignment: Bob just poured himself a cup of steaming hot coffee. Bob likes his coffee hot and likes cream in his coffee. He goes to his fridge to get the cold cream. Just before pouring the cream in his coffee ... ding dong ! someone is at the door. What should Bob do? Pour the cream in now, or wait until he gets back from the door? Bob does like his coffee hot ... There are many aspects of this situation that can be analyzed. …
Last reply by sweetnsimple786,
