Can anyone Identify this...thing?

This came as part of a physics lab.  Can anyone identify this thing and where I might purchase a duplicate should I need one? Description: It's approximately 1 1/4 inches long and has two holes running through the center. It's made out of rubber.

Posted by Spaceman Spiff 8 years ago | last reply 8 years ago


What is the strength of the other charge?

I need help with solving this problem in physics class. I know Coulombs equation F= k(q1q2)/r^2 The force between two charges is 2 newtons. The distance between the charges is 2 x 10 ^ -4 meters. If one of the charges is 3 x 10 ^ -6 C, What is the strength of the other charge?

Asked by Baseball24_7 8 years ago | last reply 8 years ago


Is thr any difference between a degree in astrophysics and a degree in physics ?

If yes then i would like to know which 1 of these would provide me with a better job opportunity.Also i want to know what kind of jobs will i be offered ? And will they help me to become a scientist in future ? If no thn what study should i master in order to accomplish my aim ?

Asked by Gopal Dey 6 years ago



If 96% of the known universe comprises, Dark Matter (and Dark Energy), why can't we tap the energy

To feed an energy starved world? SOURCE :Claims by modern physicists.

Asked by wingcodavid 6 years ago | last reply 6 years ago


Adding I'bles to the Physics Group

Plasmana and I have been going through the Instructables archives and adding appropriate I'bles to the Physics Group. If you have or find ones you think are appropriately, please help us out.

Posted by kelseymh 10 years ago | last reply 10 years ago


Physics, the good, the bad, and the ugly ?

I have been going through a site that has a lot of good things in it, but I am unable to confirm all of it. Has anyone ever read through this   Science/Physics miconceptions  site? 

Posted by Goodhart 7 years ago | last reply 7 years ago


Physics concepts flash animations

I stumbled on this site with all kinds of cool physics animations a few minutes ago. It has all sorts of animations illustrating physics concepts, from wave behavior to vectors to fluid mechanics to magnetism. It looks pretty cool. Some of the animations are more like just articles, and some are true animations. Requires flash to run.

Posted by Lithium Rain 10 years ago | last reply 10 years ago


A Physics problem I can't explain properly Answered

If a stick with dm/dl =const is hanging on three nonstretchable pieces of string (l1=l2=l3 and l is the distance between them) you can't find the tensions, because the problem is unsolvable if all the strings don't stretch. It is kind of obvious, because if a string happens to be 0,00000000001 mm longer than the others the tension will be zero. But how to prove this normally?  Sorry, I almost never use English for Physics conversation, so I don't know any proper words...

Asked by gruffalo child 8 years ago | last reply 8 years ago


I am doing a "plans" project in pre-ap high school physics and i need ideas!

This project is where I have to have someone else's plans for a project and I have to give a lesson over how physics works in the thing I make. I could make a building or bridge or radio and anything basically as long as its not outrageously simple and has physics behind it. however I would need to spend under $15 otherwise I have to submit what I am buying and how much each things costs ahead of time. if you have any great ideas and maybe could help with the physics behind it that would be grand! thank you!

Asked by hefner93 8 years ago | last reply 8 years ago


Optics question; physics homework... Answered

Hi guys, There is a new physics teacher at school and he asked us this question: an object fell into a very dark hole in the ground and you don't have a flashlight, but the sun is 30 degrees above the horizon. Using a mirror you have to reflect light from the sun into the hole. In one case the hole is one meter deep and in the second case it's three meters deep. The question is: what angle should the mirror be placed in relation to the sun (or horizon) to illuminate the hole? I don't really remember how to calculate this so if you can help me that would be great. Thanks!

Asked by Eunix 3 years ago | last reply 3 years ago


Physics question has me stumped

A large crate sits on a pickup truck which has coefficients of friction mu(s) =0.6 and mu(k) =0.4 . My question is how do I calculate the impact velocity if the truck accelerates (-8.0 m/s^2) and the crate slides forward 1.5 m to impact the back of the truck? Can anyone please walk me through this problem whenever you get the chance? Thank you. 

Posted by GThreep 3 years ago


Aww

Seen on Imgur, A marriage proposal between two physicists.....http://imgur.com/SKNl3VR

Posted by steveastrouk 5 years ago | last reply 5 years ago


A proposed projects for physics...

Hello there techies, the project USB charger was proposed by me to our professor in physics II. unfortunately he didn't accept such project HOWEVER he was happy. He just said that our project is not yet satisfying. He wants us to do a power inverter. We will buy a 2 6-volts battery and series it and it will output a 200+volts with a 30watts and then we will insert any charger such as a nokia cell phone charger and then voila, it should be charging. Do you think it is possible to do? And another project I proposed is that we will make a REAL TIME CLOCK using a 7 segment. I already had a schematic from youtube. and it uses a decade counter ICs but unfortunately I think such ICs are not available in our country, can you help us sir? T____T 

Posted by glennvontot 8 years ago | last reply 8 years ago




What a lot of science in a thin layer of gas.....

Spotted this fascinating article about "how the sky works" http://www.auroranightglow.blogspot.co.uk/

Posted by steveastrouk 6 years ago | last reply 6 years ago


What is the use of negative voltage. if it do same as positive voltage? Answered

Some where we can see that the circuit only require negative voltage. WHY Only Negative IF positive voltage can do the same

Asked by engineer.arpit 6 years ago | last reply 8 months ago


What say ye, Resident Physicist?

In which I ask Kelseymh his assessment of the experiment which they think may have detected neutrinos travelling faster than light. (Holy run-on sentence, Batman.) (Yes, I should have checked his orangeboard first...I'm a bad stalker. :P )

Posted by Lithium Rain 7 years ago | last reply 7 years ago


Where can I get a powerful 14 MHz radio wave generator, and what can contain the waves? Answered

I need a somewhat powerful 14 MHZ radio wave generator. I know that these frequencies are probably illegal, so what can best contain them? I have heard that Faraday Cages can, and a parabolic reflector has also ocurred to me. What would be best to contain them, and is it possible to build one?

Asked by Technicolor 7 years ago | last reply 5 years ago


is there a physics simulator that can simulate air pressure?

I want to experiment on barometers,but it is too risky and i don't have the resources.is there any physics simulator that can simulate fluid,air,air pressure,etc.

Asked by utkarshsinghal 6 years ago | last reply 6 years ago


My Blender physics simulations!

Just for fun, I created a few physics simulations in blender, All of them of a building getting knocked down with various objects(meteor, plane, car, spheres). Here it is Here is my first one, It is older And included is a screenshot of the second simulation! :D Tell me what you think :) Thanks ~ReCreate

Posted by ReCreate 9 years ago | last reply 9 years ago


Phun -- "Coolest science toy ever?"

Phun - the 2D physics sandbox, has been called the "Coolest science toy ever" by the folks at Bad Science.Phun is a neat little physics simulation environment with gravity rules, etc., and a very simple real-time interface. Try it!The free download is here.

Posted by gmoon 10 years ago | last reply 7 years ago


Jargon ... it's not just for breakfast anymore

Here's the title and abstract of a preprint that was posted to arXiv yesterday. I have no certain idea of what it all mean, and I'm a practicing physicist! I just find the ratio of unintelligible jargon to English really amusing.Monopole and Topological Electron Dynamics in Adiabatic Spintronic and Graphene SystemsAuthors: S. G. Tan, M. B. A. Jalil, Takashi FujitaComments: 21 pagesSubjects: Quantum Physics (quant-ph)A unified theoretical treatment is presented to describe the physics of electron dynamics in semiconductor and graphene systems. Electron spin fast alignment with the Zeeman magnetic field (physical or effective) is treated as a form of adiabatic spin evolution which necessarily generates a monopole in magnetic space. One could transform this monopole into the physical and intuitive topological magnetic fields in the useful momentum (K) or real spaces (R). The physics of electron dynamics related to spin Hall, torque, oscillations and other technologically useful spinor effects can be inferred from the topological magnetic fields in spintronic, graphene and other SU(2) systems.

Posted by kelseymh 9 years ago | last reply 9 years ago


Racing Game Physics

I've been designing a physics engine for a racing game for a long time now (months? years?) and I think that I've finally got almost everything figured out. The one thing that I don't know about is traction. So far my best guess for a formula is T = X + (Y * S)Where T is the stabilizing force on the car, S is the amount of slippage, and X and Y are two of the car's stats (probably measured in G's). This formula would be applied to each tire separately to account for the suspension.NOTE: The thing that might not be obvious here is that the car doesn't slip at all as long as X isn't exceeded.What do you think of this?

Posted by yourcat 9 years ago | last reply 9 years ago


Is there a way to estimate how long an antenna is?

If I built a radio transmitter and then attached it to an antenna of unknown length, is there a way to calculate the length of it using transmissions? Or, as a separate question, if I had an antenna of known length and then increased or decreased the length, would there be a way to estimate the new length from transmission properties (basically without physically measuring the antenna? Assume the antenna is a straight line.

Asked by kakashibatosi 1 year ago | last reply 1 year ago


OE-Cake = Awesome

Hey you should check this out. hhttp://www.phyzios.com/eng/casual.html Here are a few videos for OE cake

Posted by dombeef 10 years ago | last reply 9 years ago


How does 'fire cupping' work, and what's the Physics behind it? Answered

This is another unethically homework-based question.  I have to estimate the pressure inside the cup, but I don't get how low pressure is formed.  I am not sure that you can heat the air inside so much that the thing will suck in your skin immediately without giving you bad burns. Anyway, they put a match in it for a really short time... Any ideas? The topic is Gas Laws, if it can help anyone.

Asked by gruffalo child 8 years ago | last reply 7 years ago


what wil happen if two rays of light hit each other directly?

Will they neutralized each other? will the bonce off each other? or will they just go through each other?

Asked by idiot053 9 years ago | last reply 9 years ago


A way to calculate something about a ferromagnetic ball in a magnetic field? Answered

I've built something like this https://www.instructables.com/id/Mechanical-Rail-Accelerator---Non-electromagnet-%22r/ and now I am thinking of calculating the kinetic energy of a ball flying off the magnet if it was 'set off' by a ball at some velocity. I have a great lot of problems: 1 The ball is about the same size as the magnet, which makes it impossible to say it is 'infinitely small'. 2 It is near the pole, so the magnetic field is not even (not like inside a coil). 3 The ball is ferromagnetic, so the field is going to be even more disrupted. 4 There is no Physics teacher this week. Maybe (I hope) there is a formula of potential energy of something like my ball in a magnetic field? Any ideas? 

Asked by gruffalo child 8 years ago | last reply 8 years ago


Why did the duck go up? Any theories?

http://www.youtube.com/watch?v=-x-z3IAD3g8&feature;=related Skip ahead to 4:57. What he refers to as string appears to be an elastic material. He pulls up and it goes up. He pulls down and it goes up. The video is supposed to be about electrostatic toys.

Asked by Vorenus 8 years ago | last reply 8 years ago


What the BLEEP do we know?

How many have viewed the movie or read any of the books enititled: What the BLEEP Do We Know? [http://https:www.whatthebleep.com What the BLEEP link]I just viewed the shorter version of "Down the Rabbit Hole", and would like to have some opinion on whether it is worth my while to veiw the extended (6 DVD) version of it?

Posted by Goodhart 10 years ago | last reply 10 years ago


What exactly do light-sensitive elements react to? Answered

I had an old (about 1970s) large power transistor (I think it was a field-effect one, but I am not completely sure...). Knowing it is supposed to be light-sensitive I took the top of the case off, and it has a small EMF between the collector and emitter when exposed to light. But the EMF from directly under  electroluminescent lamps in the school corridor is about 10 times smaller than from lying on a sun-lit windowsill. So light-intensity can't be the only thing the EMF depends on... But what is the other thing?  PS It can't be UV, because well... we have glass in the windows at school, although it risks to get broken, as there is a football cup at the moment.

Asked by gruffalo child 8 years ago | last reply 8 years ago


3D Domino Physics Simulation!

Just for fun, I made this little video. And these What do you think?Anyways, I made that using a Physics simulation DLL for Gamemaker.Rendered and everything on my Computer, I got Framerates a bit lower than 1(what do you expect with over 1000 Dominoes?), But the recorded video output is much faster than that.Enjoy!

Posted by ReCreate 9 years ago | last reply 9 years ago


See What's Really Happening in Physics -- arXiv.org

If you are curious about what "real physicists" do, or what the current "hot topics" in research are, take a scan through the "recent postings" at the Physics Preprint Archive. Started for the High Energy Physics community in 1991 at Los Alamos National Lab under the name xxx.lanl.gov, and with a purely e-mail interface(!), arXiv moved to Cornell Univerisity with its creator in 2001.The archive includes preprints from all areas of physics research, not just HEP, as well as computer science, mathematics, and quantitative biology. "Preprints" are a way for the research community to get their results out for everyone to read, during the often lengthy period (months, sometimes!) between submission to a journal and actual publication. In many fields, it has been traditional for decades that printed copies of "preprints" were mailed out, sometimes in regular batches, between major University departments. That mechanism has been superseded almost exclusively by the arXiv database.Besides these traditional pre-publication journal articles, the archive also often includes conference proceedings, and submission of much older published papers of general interest to the community. There's also (usually in the general "physics" category) a scattering of crackpot nontraditional science papers.

Posted by kelseymh 10 years ago | last reply 10 years ago


Do you know any great physics/chemistry projects? Answered

To a upper-high school academic level. I've been just doing a homopolar motor and supercooling water. Nothing very advanced or interesting. Do you guys know any good projects? Pertaining to Chemistry, I've seen most on Instructables and few on kentchem. Pertaining to Physics, blast away! I've done limited projects although I have few bookmarked for later. Answers that can be made at home are appreciated! Additionally, answers that can be made at quickly with a somewhat limited number of materials are also appreciated. Well since answering stopped Top answers were from FoolishSage, The Skinnerz, and gruffalo child. FoolishSage wins because of the amount of projects provided. But these were all great answers.

Asked by Sh3lsh 7 years ago | last reply 7 years ago


School Project: Gravity Car Design

Hey there guys... In my physics class we have a project in which we have to make a gravity-powered vehicle that will carry a given load along a track. The vehicle can only be powered by gravity (weights) and cannot use any other energy source such as elastics, springs, explosives, etc. I have started to make a K'nex vehicle but it is not very sturdy. The following is a picture of the rules and specifications. Much help is appreciated. ThanksFullsize Images: Front PageBack Page

Posted by RaDiKaL 10 years ago | last reply 10 years ago


A strange new beast in the particle bestiary?

  Interesting article from the BBC website :- A particle accelerator in the US has shown compelling hints of a never-before-seen particle, researchers say.  The find must be more fully confirmed, but researchers at the Tevatron are racing to work through existing data.  If proved, it will be a completely new, unanticipated particle; researchers say it cannot be the much sought-after Higgs boson.  It could also signal a new fundamental force of nature, and the most radical change in physics for decades. The full article is HERE.

Posted by AndyGadget 7 years ago | last reply 7 years ago


Long range magnetic field?

Hi,right now i am stuck with my research.I want to make a long range magnetic field 14 m (approx) please help me 

Asked by ajose4 4 years ago


Anyone know about adding gears to a rubber band powered car? Answered

Would it increase the distance? If so, what size of gears or the gear ratio? How would I incorporate them to the wheels? 

Asked by bluefly1215 8 years ago | last reply 8 years ago


"flute" hole size and spacing

I've got a clarinet mouthpiece and some pvc pipe...25mm but i'm sure I can adapt it bigger if necessary. Is there some elegant equation (like where the natural harmonics on a guitar lie) to calculate the spacing and diameter of the finger holes for chromatic tuning?

Asked by timgray 9 years ago | last reply 9 years ago


Any good small projects to impress 13 year olds? Answered

   I've taken up a habit of making some tiny pocket-sized (or school bag sized) projects (one each week) and carrying it around with me to entertain Years 7 and 8 (12-14 year olds) and teach them some Physics at the same time. I've looked through some ordinary school demonstrations, but I need something small, great, not needing much preparation to show it, and also something none of them has ever seen, which is pretty hard...    After a little more than a month I've already ran out of ideas, but I don't want to finish this practice, because both I and the kids like it.    Any ideas???

Asked by gruffalo child 8 years ago | last reply 8 years ago


Camera Stabilizer (Physics related)

I had an idea for a camera stabilizer a while ago which involves some basic rules of physics. I've done some thinking on it and I can't seem to figure out if it would really work or not. It involves two principles: 1.) Torque (t=f*d) 2.) Inertia (p=m*v) ---- The idea is to combine a gimbal design found on camera "gliders" like these: -Commercial product: http://www.bhphotovideo.com/c/product/521721-REG/Steadicam_MERLIN_Merlin_Camera_Stabilizing_System.html -Homemade design: http://www.diycamera.com/stabiliser/index.html ...with some sort of see-saw to counter the effects of up-and-down motion.  Ignoring the fact that this might be somewhat hard to hold such a thing, I just want to know if this would work. ---- Any balanced see-saw will have an equal amount of torque on either side of the pivot point. Therefore, a balanced see-saw will work with 500g hung 10cm from either side of the pivot point, OR 750g 5cm from one side and 250g 15cm from the other side (750*5=3750; 250*15=3750).  With this concept, I thought of designing this part of the stabilizer like a small camera jib (http://en.wikipedia.org/wiki/Jib_(camera)). That is, the camera on one end with a counterweight on the other. The pivot point would have a handle or some kind of vehicle mount on it.  The stabilization occurs (or so I'm thinking) because of inertia. Inertia=mass*velocity. So, when the pivot point (the handle) moves up or down, one of the sides of the see saw should move up faster than the other. The side that moves up slower (the longer side of the see saw, I'm thinking) should have the camera mounted to it.  ---- Is there a flaw somewhere in my thinking? THE QUESTION: Would both sides of an uneven length, balanced see-saw move up at the same time when the pivot point is moved up or down? I'm not really sure and I'd like to hear your input. 

Posted by John Smith 6 years ago | last reply 6 years ago


I have to create a planet habitable for the survival of human life? Answered

There is a science competition and we have to give details for a planet that has a possibility of sustaining human life. I am a bit confused as to what should I include. There is so much - Orbits and rotation, atmosphere, crust mantle and core, soil type, biodiversity, water, plants, food, metals, magnetism, gravitational force...

Asked by ayusha1081 6 years ago | last reply 6 years ago


What type of animation is this?

So I saw this video which is a wonderful video on physics: http://vimeo.com/64951553 I really love the video content but was unsure about the name of the type of animation she used. Also, I was unsure about how I could go about doing this type of animation or similar. A few days ago, it struck me that technically speaking, she could have drawn a frame and then redrawn it multiple times and played them. Unfortunately, this is a huge amount of work to do so I was also wondering whether there was a faster way to achieve this type of animation (assuming I already have all the frames for a regular animation without the moving lines). I am not exactly a genius in the art and animation field but was very curious. I guess it would be possible to do a small scale animation like a title where I could write a title or something and then redraw it five or six times as close as possible and make it a GIF image but again, on a larger scale there would be a huge amount of work that would needed to be done.

Asked by blinkyblinky 5 years ago | last reply 5 years ago


What is the specific pressure of a liquid called?

I am more specifically referring to shielding gas for welding, C25 (which is 75% argon, 25% carbon dioxide). How do I find out what pressure the gas will be at a given temperature? This is, of course, assuming that the gas is liquefied and contained. If I left something out (because I don't know a lot about this particular conundrum) tell me, I'll comment back.

Asked by thecheese429 9 years ago | last reply 9 years ago


What to ask for in the letter to Santa Claus?

   Everyone (and my brother) started writing letters to Santa. I thought I was too old for that, but my mum obviously wants me to write it, so I'm having deep thoughts on the topic.     What should I ask for? It has to be something fun, but not life-threatening, not very toxic and having a possibility to become mum-approved...    I've been thinking a smoke machine or a Geiger counter

Asked by gruffalo child 8 years ago | last reply 8 years ago


Casimir Effect Outside a Lab

Does anybody know how to go about recreating the Casimir effect outside a lab? Say I have a vacuum chamber and two copper plates. I want to create the Casimir effect within the vacuum chamber, Only problem is that to do so, from my understanding, I'd have to have the copper plates within nanometers of each other, I've heard of methods using oscillating crystals...can anyone help me?

Asked by ted_gress 3 years ago | last reply 3 years ago


water in 2 tanks

Hi, I have coffee machine with small water tank. i want to put large water tank next to it so i would not need to refill it every time. my problem is that the water tank in the machine is not sealed, so if i put more water with a hose from bigger tank it will spill out.. How can i create bigger water tank next to it so the smaller tank will refill automatically? Thanks, 

Posted by gabik 6 years ago | last reply 6 years ago