### Calculating Speed?

If you have an object with a mass of 2000 grams, and it has an average force of 635.029 kg pushing it for a distance of 6.096 meters before it becomes a free-flying projectile.  How fast is the object traveling after the 6 meters and how do you calculate it.

Asked by jj.inc 6 years ago  |  last reply 6 years ago

### speed controller ?

You can make a washing machine motor with the module and taco run with a potentiometer switch to give you speed control over the motor I have the planes for a hot point motor but not the motor im using !! does anyone have the no how as to with leads to connect to contact mrkeithg.rumsey@tesco.net

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

### speed of light?

I want to know the derivation of relative velocity formula used by Albert Einstein to prove that nothing can exceed the speed of light. Is there any simple derivation? please help

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

### Speed Cameras

Posted by trebuchet03 11 years ago  |  last reply 11 years ago

### Speed sensor

I have a 60 tooth ferromagnetic ring gear with a speed sensor attached. Each passing of a tooth creates a pulse in the sensor sending a signal to the ecu for calculation of attained rpms. It calculates the interval between the teeth to obtain the rpms, thus determining when to kick in the rev limiter on my 06 polaris ranger XP 4x4. Is it possible or even practical to eliminate every other tooth to "fool" the sensor into a lower rpm reading, and creating higher rpm levels within the motor?

Posted by hiatt65 11 years ago  |  last reply 11 years ago

### wind turbine speed?

i have herd that the minimum amount of wind required to power a (homemade) wind turbine is 10 m.p.h. is that true? and whats the maximum wind speed?

Posted by Sun Gear 8 years ago  |  last reply 8 years ago

### Speed of sound question !!

My friend and I were debating : If somebody sitting in the back of a plane cockpit going faster than the speed of sound ( the whole plane that is, imagine it was the SR71 ) insults the pilot at the front will the pilot hear it and turn around to punch the guy sitting in the back? This one might be more understandable: Can someone sitting in the front of a super sonic plane hear the guy in the back, without the help of microphone and all that crap. My friend thinks it is impossible becose the plane is going faster than the speed of sound and the sound from the guy at the back will not go fast enough for it to catch up. I think that is total nonsense Anybody knows the answer ????

Posted by vince086 10 years ago  |  last reply 10 years ago

### Speed Challenge Group

Join our new Speed Challenge Group to keep up on what's happening with all of the challenges run by the editors on the site.  There you can see what challenges are currently running (sort by recent), and all of the challenges and winning entries from the past.  You can also start forums to discuss which were your favorites and what you'd like to see in the future.  By joining the group, you should be able to get updates when a new challenge is submitted.  You can also add it to your RSS feed so you know you'll never miss a new challenge!

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

Ok, I'm building a motorized projector screen, almost exactly like this: http://www.youtube.com/watch?v=GgIqx-iKNcw , except on a much larger scale. The actual screen will be made out of blackout cloth (what the back of curtains are made out of), and the screens construction will be similar to this: https://www.instructables.com/id/Cheap-DIY-100quot-Projector-Screen/ . The screen's size will be somewhere around 20x20 (feet), because it will be used in a fairly large auditorium. The screen will hinge up and reside (when not in use) above the stage. The top of the screen will have some hinges attached, so the screen can "fold up" into the ceiling. Toward the bottom, on the back of the screen, there will be a steel cable attached to the frame. This steel cable will be fed into an electric winch, which will be mounted on the ceiling. So, when the electric winch is activated, the screen will either hinge out, or it will hinge up into the ceiling. I know its hard to understand, I've done all the explaining I can. Ask questions if you have to. Anyway, the problem is this: What if this steel cable broke/got frayed and snapped/got chewed up by a darn rat, etc? The projector screen would come hurtling forward, knocking out anyone in its way. So, I need something that limits the speed that the screen can be lowered. I need some kind of hinge that limits how fast the screen can be lowered, so if the cable does snap among other things, the projector screen will make a graceful descent and people will have enough time to get the hell off the stage. Now, Do I think the steel cable is going to snap? Hell no. In fact, the steel cable I'm planning on using will handle over 1000 lbs. The total weight of the projector screen? Maybe 70 Pounds, at the most. These speed limiting hinges are just for that "extra" step of safety. So, does anyone have any suggestions?

Asked by tyler9613 9 years ago  |  last reply 9 years ago

### what is the speed of dark?

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

### change the speed of the Servos ?

I new in arduino and i'm building a robot arm how do i change the speed of the Servos ?

Asked by mogy336 2 years ago  |  last reply 2 years ago

### Gs to Speed Converstion

I am looking for the math equation that converts G load to speed using Arduino (https://www.adafruit.com/products/2796)?  I am building a high power rocket data logger/controller. I need to know the speed by using accelerate of the bird. Yes I might be able to use GPS info, but at super sonic speed GPS can not keep track of the speed. The bird is a 2 stage bird. I want to stage when about 40% of the speed has bleed off.  Thanks Rocket Nut

Posted by Rocket Nut 2 years ago  |  last reply 2 years ago

### Low Speed Motor?

I want to make a baby night toy with multi color LEDs and a rotation device. For which i need a low speed motor. Can someone help me find such a motor or give any idea on how an ordinary motor can be used for this purpose? thanks in advance for all the feedback.

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

### Hyper Speed Cams

Ok heres my problem im making some videos and i was wondering how can u make a video go slow mo ~does any one have any software for this? ~is it possible ~can i do this without hyper speed cams? Thanks Peace~ Zero

Posted by zero0928 11 years ago  |  last reply 10 years ago

### Increase running speed

I don't run very much. I never was all that good at it. Lately, though, I have found the need to improve that ability, specifically my endurance at speed. I can slowly jog a mile, sure, but haulin'-ass-away-from-an-amgry-man-with-a-knife-speeds don't last much longer than thirty yards, if that. I'd like to improve my overall speed if possible, and especially increase the distance that I can cover flat-out before I keel over. I'm not going to be running a marathon anytime soon, but I'd like to be able to get farther than average, as fast as possible, on demand. Any tips for training or proper form? I live at roughly 5400 feet, but I'm just a short drive away from 14,000-foot peaks. I would also like to improve my off-the-line times--in other words, acceleration. If I were to need to run between ten and twenty-five yards, I can do that at my top speed as is, but that speed is not as fast as it could be. I'm generally not even up to full speed until eight or ten yards past the line. Suggestions?

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

### Anti-speeding device?

I am going to be buying a new motorcycle soon after spending several hundred dollars clearing up my previous youthful errors with my last one. Anyways, I am thinking about rigging a bright LED to the top of the windshield that comes on when I go above a certain speed. Right now all I can think of doing is like in the old movies when then make a time-bomb is drill a hole in the face of a clock (speedometer in this case) and have a wire come in contact with the speedometer when it reaches a certain speed. If anyone can come up with a more efficient and elligant idea and how to do it please email me at cjp91068@msn.com Thank you ahead of time, Chris

Posted by cjp91068 12 years ago  |  last reply 12 years ago

### Gameboy Volt / Speed ?

Hi, I am working on a little project with my olde Gameboy Color ! I am taking it out of its case, and building a wooden / bronze one in SteamPunk Style. Now to get even Nerdier i am considering to build a "Stirling engine" and power the little machine with a Dynamo attached to it! However this might turn out, i would like to know if the dynamo generates more than 3V if that would speed the Gameboy up, or simply fry it? I will add a Good Resistor to prevent that btw :p

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

### Sailboat Speed Comparisons

Portsmouth Yardstick is a rating system so different boats can race and supposedly the best skipper will win. It's a good way to see how fast different boats go around a triangle course.They've got hundreds of types listed and rated.I've written up some observations illustrated with videos here

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

### can i speed up my modem speed?

am in rural kenya & i use a modem to browse. i wonder if i can speed up internet connection by buying a router or whatever they use in big cybers. can anyone advise me on internet connections available in kenya or the modem can be speedup by buying any gadget to plug it in. dont worry am poor in networking.

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

Null

### How to make a speed meter to stop cars from speeding?

Ok folks, I live along a street where people come blasting through, and I want it to stop considering there are kids who kindof like to play on it. Here is born my idea: A speed meter that sits in my yard. If it senses a car going faster then about 30 MPH, it will automatically set off a siren, scaring the crap out of people and making them slow down. I don't want to hear about how this may/may not be illegal, I'll go to jail if its for the sake of saving our kids lives. So I was thinking about how to do this. An Arduino might work...but I would have to find some type of speed meter to use as a serial device for the Arduino, and after I did this, it'd be pretty easy. Just wire up a siren to a relay on one of the Arduino's outputs and away I go. Anybody know where I could find a speed meter that will work with the Arduino?

Asked by tyler9613 8 years ago  |  last reply 8 years ago

### DC Motor speed controler

Hi all Can anyone suggest the best way to replace the variable speed trigger of a 18v battery drill, with a remote from the drill adjustable speed control. I want to control the speed and have it stay at the setting until I turn it off or adjust the speed. The drill will be clamped to a board with no battery and powered by a power supply. Thanks for any advice Les

Posted by Les1951 4 years ago  |  last reply 4 years ago

### New Speed Contest Coming Tomorrow

New speed contest to be announced tomorrow. Hint: You don't need a hint.

Posted by fungus amungus 10 years ago  |  last reply 10 years ago

### HELP making a 3 speed bike

How can i make a 3 speed gear change bike, instead of 18 gears i just want three

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

### Can you speed up the video?

Can i speed up part of the video (eg, something cooking) because the thing i want to do takes 30 seconds to microwave?? please let me know :)

Posted by DELETED_JoshM96 9 years ago  |  last reply 9 years ago

### OMG! It's another speed contest!

You thought we forgot about Valentine's Day. You thought wrong.Enter the Share the Love Speed Contest and win some robot chocolate.Mmm... robot chocolate.

Posted by fungus amungus 11 years ago  |  last reply 11 years ago

### High speed digital video camera

I'm looking for high speed digital video camera in price about 5000\$. Witch can recording movie in full HD with over 1000fps. Do you know any stores where can I buy something like this. Thanks for help, Pirotech

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

### New Speed Contest Up Now

Mmm...3.14159265UPDATE: The contest has launched! It's a Pie Contest. If you select all the text in this forum post you'll see the hint.

Posted by fungus amungus 10 years ago  |  last reply 10 years ago

### Question regarding speed electricity

Hi people! I have another thing which i do not totally understand, so as usual i have asked in one of my favourite sites! :) I always had a doubt on how "fast" is electricity. In our real world, i can observe that it is pretty fast. If i turned on a switch connected to a light bulb, i can see it turned on pretty much "instantaneously". So a question came to mind, how fast it really is? Is it near to the speed of light? So, i did some googling. According to what i have found and understood so far, it is the electric field that carries information and not the electrons themselves. And electric field travels near to the speed of light( of course, depending on the medium).  If that is the case, then from the "textbook" definition of electricity, it is the movement of electrons right? But according to what i have understood so far, electrons move pretty slowly. In DC a few millimeters per hour or so(not having the exact figure in mind, pardon me) and the average displacement in AC is zero. Then how exactly is electricity so fast? I would appreciate it if someone explains it in a simple way, both on speed and what exactly is movement of electrons. :) Update: Okay, so far my questions are answered, and it seems to take off in different directions(like science always does :D). So to stay true to the question posted here, i would like to say my doubts cleared! Many thanks to people who have answered my question, Specially Dr.Kelsey and Josehf , for the information provided! I will post other doubts in new topics.

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

### Speed control for a 24v to 250w wheelchair motor Answered

Speed controller for a 24v to 250w wheelchair motor. Can anyone give me a list of parts needed to build  this also a  circuit board diagram showing where to put the components and the size of the PWM that would be required. Thanking you all again. hoplite66

Asked by hoplite66 8 years ago  |  last reply 3 years ago

### AC motor speed controller for stereo turntable

Hello Brainiacs, I am wondering about salvaging a electric fan speed controller for my Vintage (1980's) Stereo turntable. I purchased a table from Europe and it ran on 50Hz 240v. But once I rewired the unit for 110v 60Hz it still ran too fast. It is a synchronous 24 pole motor driving a small pulley and belt system. I was told a speed controller would fix the issue by varying the voltage. True? Or if someone could come up with a schematic! ??? Any suggestions?

Posted by bullit224 5 years ago  |  last reply 5 years ago

### How do I speed up my laptop?

Pentium 4, 2.66 Ghz, Compaq nx9010. I reinstall the software that came with it and it runs fast for a while and then slows down again. What am i doing wrong?

Asked by Packers Widow 9 years ago  |  last reply 4 years ago

### what would be the best way to increase the speed of a small electric motor? Answered

Asked by wenpherd 9 years ago  |  last reply 2 years ago

### I wan't to know about the speed regulating device known as a governor.

It's also known as the centrifugal governor.It is used in vehicle engines.It's function is to limit the speed of a mechanically driven device.

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

### what kind of experiment could be made to measure the speed of light (with a laser for exemple)?

Asked by darkmind64 9 years ago  |  last reply 9 years ago

### Nice Little Speed Contest Starts Today

New speed contest to start later today. More details soon.

Posted by fungus amungus 11 years ago  |  last reply 11 years ago

### How to control DC motor off and on cycles.

I need to control a radio control boat,  i want to cycle the motor on and off to extend the life of the batteries 6 - 12 v 40A my feed would be a normal radio control speed controller Thanks Ian

Asked by ian.collins.771 4 years ago  |  last reply 4 years ago

### Has anyone ever invented a practical microwave-freezer? Answered

You can get water from room temperature to boiling in under a minute, but how could you get it from room temperature to freezing in about 2? Obviously I'm referring to more than just speed freezing water, could be useful for other stuff too. I was just wondering if it was even theoretically possible to make something that did this.

Asked by McDouche 9 years ago  |  last reply 5 years ago

### How do you play the card game, Nerts? Answered

There's a card game called Nerts, which is highly similar to Squeal, but I can't remember the differences.

Asked by jacobz_20 6 years ago  |  last reply 6 years ago

### cpu mhz help

I have an amd duron at home, but no clue how fast it runs. the only other information on it besides a cpu id is C1999 anyone know about hom many megahertz this thing runs on??

Posted by tech-king 11 years ago  |  last reply 11 years ago

### i want to make a digital speedometer... What would i need to make it myself ?

I want to make my own digital speedometer for my Suzuki Gs150. I could search the market and buy one but want to make this myself since i think dere's not too much required plus i should know how to. Just for the sake of doing something to upgrade my ride. Would like to add, Any help would be great, As i am eager to learn since i have alot of projects forthcoming, doing my industrial design.

Asked by H4D1 9 years ago  |  last reply 7 years ago

### Slowing a motor

I have a 4 Watt mains powered motor that currently spins at 1.6-1.9RPM. I need to find some way of slowing it to maybe 1 revolution every 10 minutes. It's all sealed in a metal case and connected to the mains by a standard plug. I really need to find a way to do this without breaking it apart stuff as it may need a safety test later, I looked at dimmer switches as they essentially limit the voltage and are a max of 300w. Like this - http://www.jpgelectronics.com/products.asp?partno=350.109 I realise that they are made for lights but it's a similar principle and is only about £6. Would this work? Are there other options if I don't want to break into the motor housing or wiring? Thanks.

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

### New Speed Contest: Toss It!

Show us the best paper airplane you have! Toss It! Speed Contest

Posted by fungus amungus 11 years ago  |  last reply 11 years ago

### New Speed Contest Announced!

You have three weeks to make an Instructable that involves LEDs. Go!https://www.instructables.com/id/How-to-Enter-the-Get-the-LED-Out-Speed-Challenge/

Posted by fungus amungus 11 years ago  |  last reply 11 years ago

### Controlling the speed of the ceiling fan?

I have a standard ceiling fan of which the speed can be controlled by pulling the cord. As the slowest of the three speeds is still to fast, I would like somehow to be able to lower the speed. Is there any way of doing this? The fan operates at 220V

Asked by nightlife31 9 years ago  |  last reply 8 years ago

### ac motor speed control

My uncle recently gave me a compact, functional ac motor with an axial blower attached to it. its a pretty cool thing, and i am planning on putting it in my mac's plexi case (when its built). i have no clue how to vary the speed. from what i found on wikipedia, an inductance motor cannot have speed control. how do i know if this motor is brushed or inductive?? and if its brushed, how do i vary its speed? help!!??

Posted by tech-king 11 years ago  |  last reply 8 years ago

### Cheap High-speed Camera

Yes, I know, It's an oxymoron. I've always wanted a high-speed camera, but they are way too expensive. I was wondering if any of you fellow Instructablers have a high-speed camera that you've lost interest in, and are willing to sell for a low price. Alternatively, if any of you know how to make a cheap, high quality, high-speed camera, could you post an Instructable? Edit: I bought a Casio EX-F1 a while ago, and even made an iBle about it. I also have a bunch of videos here.

Posted by Spl1nt3rC3ll 10 years ago  |  last reply 2 years ago

### 1-Week Speed Contests

Did y'all get rid of the speed contests? I thought those were fun because of their rapidness. Or did y'all just move it to the back burner?

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

### 0.3mm nozzle printing speeds?

I am currently finetuning my homemade hotend and was wondering what you guys have in the speed settings for 0.3mm nozzles printing ABS? I started with the aim of reaching 120mm/s but after some hours of finetuning I am currently trying to breach the 200mm/s barrier. As I am only using a very old Mendel Prusa I am actually quite happy that I got that far. What speeds are possible with the current printer models? (not the statements on the website, real life)

Posted by Downunder35m 3 years ago

### EASY FAN SPEED CONTROLLER

I have a 12dc sever fan installed into and old fridge to be made into a jerky dehydrator. what i need is a simple TWO POWER WIRE IN and TWO FAN WIRES OUT speed controller as the fan empty's the air from the fridge in 2 seconds flat. what i need is a controller with three speeds and an OFF. i can make one very easily from a detailed schematic but please keep it simple

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