### Physics Question?

Hi Everyone,   I know that this is not a project related question and I promise not to make it a habit, but my physics teacher stumped our class with a question today and I thought of all the smart people on Instructables one of you would know the answer. I have already search google to no avial. Is it possible to determine the volume of a flask given only the starting temperature/pressure and the final temperature/pressure? The number of moles are unknown. If it is possible how do you determine it? Thanks for your help!

Asked by Hammock Boy 6 years ago  |  last reply 6 years ago

### Quantum physics

Wow I was looking for some info on quantum physics and stumbled on this *cough* nut job *cough* and check this out *cough*Scam! *cough*

Posted by iman 10 years ago  |  last reply 10 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

### physical ip protector?

Would it be possible to build a physical hub, for protecting your ip, like some sort of adapter, u first plug in you internet cable to it, then you plug the adapter into your computer?

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

### Physical Spectrum Analyser

Hi! I'm planning to build a physical Spectrum Analyser - a tangible model capable of showing audio levels (or something like that). A moving, undulating board of pillars that rise and fall with music. Spectrum Analysers split audio inputs into 'Bands' and normally then express these values with light boards (LED's). I want to use an audio input to create kinetic power. Is this possible? I'm thinking a series/grid of actuators might serve to raise/lower blocks and columns. This is all new to me! Much appreciated. Any thoughts?

Posted by Jaminajar 3 years ago  |  last reply 3 years ago

### LED physical durability

Heya, So, I'm thinking of making a flashing rattle, by using LEDs and batteries as the "stones" in the rattle. My thought is that when an LED randomly connects with a battery correctly, it will flash. But, will this destroy the LEDs very quickly? Shaking a light bulb is bad, but I think that LEDS are a bit more durable than that. Don't know HOW durable though. Any other thoughts that would help me?

Posted by AidanG 4 years ago  |  last reply 4 years ago

### Physics puzzle games- Auditorium, World of Goo and Crayon Physics

I really like puzzle games. I've played two that are really addictive and beautifully made, and found another that looks great.AuditoriumAuditorium has a free on line demo. I've played through the levels a few times. The full game hasn't been published yet.The screen has a stream of light particles flowing into it. You have one, or more, buttons that will affect the path of the particles: like one that bends the light stream to the right, or one that pulls it into a vortex. You move the buttons around to steer the stream into boxes that are scattered around the screen. There are many particles in the stream, and by careful placement of the buttons, you can split them into different paths. When you hit the boxes with light particles a new group of instruments join a symphony you hear. The goal is to get all of the instruments playing.Some levels have areas that will change the color of the light particles as they pass. Some of the music boxes are different colors, and you will have to route the light particles through the color changer before you send them it into the box. Try it out, the free online demo will make it very clear. I didn't even look at the directions. It's easy to find your way as you go. I love a game like that.PlayAuditorium.comWorld of GooIn World of Goo, you have to stick living gooey balls together to make lattice and build some kind of structure (tower, bridge, rope, ...) that allows the gooey balls to reach the end of a pipe that sucks them up. The Gooey structures are not stiff. If you don't build your structure carefully it will bend and can collapse under its own weight. It is a 2D game with a comic book style to the graphics. There is also a level designer and an online community where you can share new levels. I haven't experimented with these yet - I'm still working through the levels that came with the game.There is a downloadable demo for both PC and Mac. There is also a WII version for sale.It is drawn and designed beautifully. Totally addictive.2dboy.comCrayon PhysicsI haven't played this yet but it looks really great.The graphics look like they were drawn by a 5 year old with a box of crayons. When you get to a level, it presents a drawn scene with a star and a ball (it's actually an apple. Must be a tribute to Newton) somewhere in it. You have to draw some kind of mechanism, or ramp, or some objects, or... As you are drawing, the objects develop mass.Everything you draw then reacts with gravity. You have to harness the momentum you get from everything dropping to the ground in order to push, throw, drop or guide the ball so it hits the star.Look at the video it is self explanatory. CrayonPhysics.com

Posted by SFHandyman 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

### 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 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

### 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

### 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

### Computer program learns physics

From Wired:"In just over a day, a powerful computer program accomplished a feat that took physicists centuries to complete: extrapolating the laws of motion from a pendulum's swings.Developed by Cornell researchers, the program deduced the natural laws without a shred of knowledge about physics or geometry. ...Condensing rules from raw data has long been considered the province of human intuition, not machine intelligence. It could foreshadow an age in which scientists and programs work as equals to decipher datasets too complex for human analysis."LinkThe software has a long way to come, but apparently it's showing a lot of promise.What do you guys think? If computers can do physics better than humans, does that make human physicists obsolete?

Posted by drinkmorecoffee 9 years ago  |  last reply 8 years ago

### Physics Competition Car Design

Hey Everybody, I'm new to the community here, and i am hoping that with so many great minds on this site, some great ideas will be generated. the deal is, for a competition, my school needs to build a small car, around 1foot by 1foot, and it is propelled by three average sized rubber bands, it need to travel three meters straight, make a 90 degree right turn on the spot and travel 2 meters to stop in a parking zone, it has to turn and do the whole course unaided, Any great ideas? Thanks for helping me out

Posted by techball 11 years ago  |  last reply 11 years ago

### Musical Junk Physics Project

Posted by BeanGolem 10 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

What's the Instructables HQ physical address? Now that Google is offering directions by walking, I can find out how long it would take me to trek halfway across the country...

Posted by KentsOkay 10 years ago  |  last reply 8 years ago

### Physics equation for air displacement? Answered

I want to make a fan powered go-kart, is there a formula I can use to calculate the minimum amount of air displacement to make it move?

Asked by A-Nony-Mus 9 years ago  |  last reply 9 years ago

### Survey on Physical Computing and Microcontroller

Dear user, I need YOUR help in order to get some insight into the substance of microcontrollers and physical computing. The basic question that needs to be answered is, what the problems are that occur in the process of physical prototyping, what the reasons for these problems are, and how these problems can be avoided. The results will be used in a bachelor thesis, that deals with this topic, trying to find out how easy - or difficult - it is to enter that particular field. I kindly ask you to follow the following link and to participate at this survey. http://www.kwiksurveys.com?s=NJDNHK_210fb8e2 Thank you very much in advance! Vletsou Ioanna LMU - University of Munich

Posted by asking-student 7 years ago  |  last reply 7 years ago

### Flight Physics of a Golden Snitch?

Does anyone know if it's possible to build a miniature battery operated ornithopter with a spherical body?  I'm interested in attempting to make one and would greatly appreciate any information.

Posted by SHIFT! 7 years ago  |  last reply 6 years ago

### Physical Representation of Sound by katrusso? Answered

having trouble with the grasshopper script in this instructable same problems as the feedback form akshatm 1. Line 37: Function 'ParseLine' doesn't return a value on all code paths. A null reference exception could occur at run time when the result is used. any suggestions on solving this issue?

Asked by NickP9 3 years ago  |  last reply 3 years ago

### Water wheel for Physics Class?

I have to make a water wheel that lights up a 6volt bulb and it must have a switch so that when the water is pouring and the light turns on i can turn it of while it spins if i want. I don't know what materials i need or how to use them...HELP!

Asked by aponce4 7 years ago  |  last reply 7 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

### 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

### how to modify a water bottle so that it will keep cold water in it for a longer time?

Asked by ashishjoshi289 6 years ago  |  last reply 6 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

### Compute the force required punch a 1.25-inch diameter hole through a 1/2 inch boilerplate. The shear stress is 42000 psi

Asked by Baseball24_7 8 years ago  |  last reply 8 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

### 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 9 years ago  |  last reply 9 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

### if standing in a moving boat and jumping straight up in the air; would i land in the boat or in the water?

Asked by kimber3265 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 11 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

### Physics question? Why doesn't this work? Answered

So included I have the original "troll physics magnet car" that supposedly would use magnets for propulsion. I know that it doesn't work since the front magnet pulls the car and the car pulls the front magnet, so the energy is evened out. But if you put a stronger magnet on the front, then the smaller magnet on the car wouldn't have enough strength to equalize the larger magnet, so why wouldn't the car move forward?  What if you applied the same idea to a generator? (look at the picture with the circles and rectangles) Wouldn't the bar magnets continue to repel each other and make the generator wheel would spin forever? If the wheel was balanced and was given a little push to get things going, I don't see what the problem would be. I'm not planning on building this machine, so trial and error is out of the question for me.  Please help!

Asked by masterbuilder 7 years ago  |  last reply 8 months ago

### Physics Illustrator on NON-tablet PC

Well, I've recieved a private message from well over fifty people in the past 30 days requesting that I re-compile and distribute the Physics Illustrator, so I got off my lazy butt this morning and made it. links are updated and working.

Posted by bleachworthy 10 years ago  |  last reply 5 years ago

### Physics project of worth 10 marks?????

I ve got to present this physics project by the ed of march and its of worth 10 marks but I have of idea of what to build.... :-( We are allowed to use only the things which we can find at our home( battery and wires are accepted)and the model should be working...:0 It would be a gr8 help if anyoe out there would atleast give me an idea of what to build....

Posted by blackrays 11 years ago  |  last reply 11 years ago

### Physical button to launch a PC application?

So for an upcoming project I need to make a physical button that when pressed launches an application on my PC. I'm going to need to make quite a few of these, each to launch a different app. Ideally it would not be a keystroke from a keyboard, I saw tutorials on dismembering a keyboard and registering a button press to open an app, but I don't want any interferences so I'm looking to avoid that if I can. I'm going for the most cost effective design, not looking to spend much if it can be helped. Any resources or tips would be much appreciated! Thanks guys!

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

### Well, I am sitting in Physics

I'm supposed to be working on my rocket project with my group, but we have a substitute today (hells yeah!) She's new to the school, which is good, because we are playing volleyball with a balloon, watching movies, and listening to music. Among our fun, we played Hangman on the SmartBoard, and popped balloons. Our rocket is about done, we just need to make a power-point as documentation, and we need to launch it, which we will do on friday!Oop! the bell just rang, cya in lunch!ROGER!!

Posted by bumpus 10 years ago  |  last reply 10 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

### 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

### 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 10 years ago  |  last reply 10 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