COMMUNITY

in a counter balanced system, do I need to account for both the load mass and the counter balance mass for acceleration?

I have a simple 2 pulley system lifting a 2400lb mass.  Imagine a chain lift, starting at the load mass, up over a sprocket, across to a second sprocket, then down to a 3000lb counter balance mass.  to move the load down, I'll need to apply 600+ lbf down on the load.  To move the load up, I'll apply   _________________   |O                                O|   |                                      |   |                                      | 3000lb                         2400lb counter                        Load

Asked by JFunsch 6 years ago

Lets say that a  ball of unknown mass is projected with and unknown force vertically upwards with a velocity of 40m/s. What's its deceleration??? Is it -9.81m/s2????? if so i need some explanations!

Asked by ARJOON 5 years ago

Accelerative problem...

Ok I'm in the planning stage of a secret project that is going ot be very risky if it isn't right, I need to accelerate ~100kg from ~20km/h to ~100km/h (I gave it all metric to help) over a reasonably short period of time, any improvement on 100km/h is welcome because I've done this without rockets in the past. Can anyone give me any idea where to get rockets that would be of suitable power, the largest estes rocket peaks at 25N of thrust and falls to 10N of thrust for only 2.5s after this, 10 of them would cause an acceleration of 1.41666. m/s2 which isn't much use to me. Unless I did my maths wrong, it's been a good while since i've done anything like this... Basically I'm looking for thrust and alot of it, preferably from something inexpensive but on this one I wouldn't mind paying a bit... Also I did look at the homemade candy rockets but I wasn't sure I'd be able to achieve the amount of thrust safely...

Posted by killerjackalope 10 years ago

Vibration comparison

I'm trying to compare two wildly different measurements, but I don't know enough about the physics of sound to even know what information I'm missing. I don't need exact numbers: some upper and lower limits would be fine, and perhaps even "back of the envelope" calculations in case the required information can't be found. I'd appreciate some advice on the formulas I need and what measurements am I still missing.  Object A is producing a sound whose intensity measures 25 dB at a distance of 1 meter.  This sound is, roughly speaking, a band-limited sawtooth wave with a fundamental frequency of about 35 Hz.  Object B is being driven up and down a distance of about 0.5 mm with an acceleration of 0.3 times that of gravity. The sound doing this is a sine wave with a frequency of 35 Hz. I'd like to compare the peak accelerations experienced by the two objects.

Asked by CuriouserAndCuriousest 4 years ago

Ok, here it goes:   In the description concerning general relativity, the following scenario is depicted:  Jim and Slim are riding a "Tornado" ride (goes by different names, but essentially is a centrifuge that pins you against the outer wall and then drops the floor out from under you. Sometimes calle d PUKE machine). Anyways, looking at the ride from a bird's eye view, one measures the circumference and the radius and we find that the ratio is two times PI or about 6.28.  Now that is from OUR perspective, but from Slim's and Jim's measuring the circumference (so says the book) will give a different answer since they are traveling at high speed (assuming the speed is fast enough to invoke the Lorentz contraction).  Thus, he says in the book that his measurement will come up short and therefore not be the same ratio noted.  I don't doubt this, but I have a problem with not taking into account the lengthing of the circumference because of IT'S motion forward.   Am I missing something?   Why wouldn't the same effect  be proportional to the lengthening of the ruler used to measure the circumference, seeing they are traveling at the same speed?   Am I taking his example TOO FAR (in other words, he is assuming the ride is there but not physical)?   Maybe I over analyze?  :-)

Posted by Goodhart 6 years ago

A jet engine powered gokart?

Hey guys/girls, I need some assistance. for my Year 10 metalwork major, im going to attempt to make a jet engine powered gokart. I need some assistance with the plans for it. I need to find a way to make a gokart frame, acceleration and brakes, and a working jet engine powerful enough to propel the kart. any ideas are welcome, no matter how weird :) cheers

how to make a standard on/off rc car have variable acceleration? also how to soften rubber?

I bought a "bigtime muscle" rc car from walmart to hack and mod, one of the mods being making the car have variable acceleration. this car has a rather simple receiver board and a unidentifiable control chip, but how to higher grade rc's make their acceleration variable? is that on the car or in the remote? also, the car had rather tough/hard tires on it, so it has very bad grip/handling, is there any way i can soften the tires, or would i have to buy new ones that are softer?

Asked by zack247 7 years ago

When using accelerators in concrete in dry conditions, do you still need to "hydrate" the concrete? How long will it take to cure using an accelerator?

The possibility of crane-based railguns

It's just a curiosity. Anyway, so there I was, reading up on railguns (just for the heck of it), and after reading the part mentioning "millions of amps", it got me thinking, "What power source can provide millions of amps?" Then and there, I thought, "Lightning!", but how I could I use it? Wait... Oh, cranes! I could stick the railgun on a crane, then whenever the crane gets hit by lightning, it would fire a projectile! Now, who's willing to risk their lives to load a piece of metal up there? :D Nah, just joking. Anyway, I was just wondering if this idea would be feasible in the first place, and what would it take to implement.

Posted by nutsandbolts_64 5 years ago

Is it possible to set fire to a dvd w/o an accelerant?

Asked by pyro man 9 years ago

Hello!  I'm working on a homemade mini particle accelerator from stuff in like hardware stores and thrift stores. I was wondering if someone could give me a definition of a particle accelerator and their hazzards? Also the only thing that I would need to buy off eBay is a some sort of detector for electrons. Heres a list of supplies: concrete, CRT Monitor, wood, lots of thin copper wire (for the electromagnets), a electron detector, and a power supply. It would be a circular accelerator too. Any ideas or info is welcome! PM me or just comment below!

Asked by joespicnictables 7 years ago

Accelerator in a bowl

I want to help my kid explain particle accelerator with this project; I think I get the conductive balland positive/negative strips. What do I use to get "high powered dc current"? any suggestions ?I would like this to be self contained i.e. not plugged in. Thankshttp://www.symmetrymagazine.org/breaking/2008/03/26/accelerator-in-a-bowl/

Posted by sabadin 9 years ago

How to measure Velocity/Acceleration of bicycle

I want to measure velocity or acceleration of a moving body(E.g: Car,bicycle,etc) without using a GPS module. Is it possible to calculate coordinate acceleration or velocity using an IMU.

Posted by Jonathanrjpereira 1 year ago

Will bleach accelerate rusting on iron to product iron oxide?

Would regular clorox bleach in a container with a peice of iron over time create iron oxide?

Asked by trf 8 years ago

Cyanoacrylate accelerators?

I just read about these substances that are usually sold in mini spray bottles or aerosol cans.  They are supposed to be very useful when you apply a cyanoacrylate (CA) glue (aka superglue, etc.) over a somewhat large, flat surface, as they enhance the alkaline conditions to speed up the polymerization of the CA.     Given this information, does anybody know if a CA accelerator can be made from scratch by regular high pH household materials, like ammonia or sodium hydroxide?  If so, what concentration do you think would work?

Asked by jim5150jvc 5 years ago

Linpack Benchmarking on PVM with CUDA?

I'm working on a project comparing the performance of PVM and MPI in GPU accelerated clusters. Naturally, I turned to the defacto standard for computer cluster benchmarking, LINPACK. The problem I'm running into is finding a version of LINPACK for PVM. It does exist somewhere because there are performance comparisons  of systems using LINPACK and PVM. Ive already installed SCALAPACK and all of the other libraries required for it to work, but I can't figure out how to use it as a benchmark. Additionally, I need the benchmark to be GPU accelerated. Ive looked into HPL, which is GPU accelerated through CUDA, but there are no versions for PVM. Does anyone know of a version of LINPACK that can be run on PVM and could be modified to be CUDA accelerated?

Asked by danielemur 5 years ago

directx help

Ok I am having problems with my directx driver and I need help. For some reason unknown to me almost all of my games can't start because the following directx features are not working:Directdraw acceleration,direct3d acceleration,and AGP texture acceleration. I did test directdraw and that work as it should. So what do you think the problem is?

Posted by knexfan9182 9 years ago

If I wanted to build a small linear accelerator what how would I make the electrostatic generator? Answered

I am going to build a small linear accelerator like the one rutherford used to bounce alpha particles off of a sheet of gold foil. Actually that is exactly what I am going to make. The only thing is that I am not sure how I would generate the electrostatic field. Would a van de graaff generator work, or would I need something different? if I do need something different how would I make it?

Asked by Higgs Boson 6 years ago

help with a coil gun (or linear accelerator)?

hello, i want to make a coil gun (or something) where is a good place to get capacitors (short of buying them of coarse)? any help (nomatter how off topic would be lotsa help) thanx!

Asked by cheesewzrd 7 years ago

This is a cool project, but it has one small design flaw. You are determining the angle by only measuring the z axis acceleration of your sensor. When you have the knife at an angle, you will also measure the acceleration introduced by moving the knife along the stone. So maybe you are already very ...

Tip by EkimL on Knife Sharpening Angle Coach With Bluetooth & Arduino 2 months ago

how Accelerometer work in Electrical car to measure acceleration ?

I am working on electrical car sensor system . i have many sensors in car for different purpose. one of it is accelerometer. My task is to measure the acceleration of car using accelerometer or gyroscope by Microcontroller . Please give me some brief idea about it .

Asked by RushitK 9 months ago

More on the LHC Countdown

The Large Hadron Collider is indeed large: the underground particle accelerator is about 17 miles in circumference (it is circular). Located between France and Switzerland, the LHC is now almost ready to begin full-length particle accelerations. Researchers are attempting to collide protons together that are accelerate to 7 TeV (tera electron volts).Following Tetranitrate's first post, LHC Countdown, people have been looking for more information.Even More on the LHC from Kiteman, with more explanation.Here is a great set of pictures from Boston.com, showcasing all stages of production of the LHC.For a better visual understanding of how it works, take a look at this LHC animation from the official LHC web site.More general information from the LHC web site.As I like to say, this is large and in charge.

Posted by joshf 9 years ago

Leon Lederman, Fermilab, Tevatron, particle accelerators and my school

Http://en.wikipedia.org/wiki/Leon_M._Lederman He is coming to my school in a week and all the students are allowed to go meet with him, and there is a special lunch organized for the students with him as well. Being the director of Fermilab which has the Tevatron which is the biggest particle accelerator in the world and is a physicist landmark. I am very excited about him coming and I wanted to know if you guys could help me think of questions because this may be a once in a lifetime thing for me!

Posted by astrozombies138 10 years ago

How does a bullet on a revolver get accelerated? Answered

How does the explosive in the round move the bullet? Is it just a quick bang and the shockwave gives the bullet a quick "kick", letting its momentum carry it down the barrel? or do the expanding gases continue to push it down the barrel? If it is the latter, doesn't there need to be a (reasonably) airtight seal between the chamber and barrel to stop the gases just escaping out the sides?

Asked by .Unknown. 6 years ago

Max voltage and current for electrolysis of water.

What is max value of voltage and current can be used for electrolysis of water to accelerate the hydrogen production rate within safety limit?

Asked by SahilK75 10 months ago

Bluetooth handheld remote (like a simpler wii 'chuck) accelerator/brake trigger assembly, what else is it called?

Hi All, Easy question (for someone), on this handheld bluetooth remote control, what is the hardware name for the accelerator/brake trigger assembly? It moves for and aft to control a bldc motor and motor brake circuit. I've been looking around and can only locate the 2 axis joystick. I would like to incorporate this into a different housing if I can find it. Thanks.

Asked by racecar666 6 years ago

trigger in front of hopper?

How bad would a trigger be if it was in front of the mag, for example an uzi, the ram rod will be pushing the ammo but both ammo and ram gets held back by the trigger so no time to accelerate.

Posted by Katarukito 9 years ago

Can I convert the coilgun into a railgun by replacing the firing tube with two rails? Should the current pass through the rails only for a moment (as in the coilgun)? Which can accelerate a projectile to a higher velocity?

Asked by coilgunfreak 4 years ago

problem with PS/2 to USB converter?

I bought an PS/2 to USB converter for my keyboard. I figured out a new problem when i was playing NFS MW i can't drive a car by using the converter. Every button has to be pressed separately, when i press a combination of steer left and accelerate button, the car moves left with a gain in speed when i release the steer left button the acceleration too stops, which is quite annoying while playing a racing game. Can anything be done to make work as it is used in normal keyboard?

Asked by formsarun 5 years ago

Would putting saltpetre on a compst heap be good for the compost? Answered

Since saltpetre is sold as stump remover because it accelerates natural decomposition, would it be good for a compost heap for the same reasons?

Asked by BOOM5601 8 years ago

Figuring Out Acceleration on a Potato Gun

My newest craze is potato cannons. I built a simple potato cannon powered with hairspray. I didn't plan out ratios of chamber volume to barrel volume, but I must have guessed pretty well because the potatos go far. Really far. I shoot them in an empty bean field and they stay in the air for 10 seconds before hitting the ground at what I guess is 300 yards away. I want to measure it to be sure. I'm probably exaggerating the distance out of sheer amazement. But the potato goes really far. I got to thinking, though, that I could go beyond just shooting the potatoes, and actually turn this into something useful. If there was a way to determine the acceleration of the potato inside the barrel, that would be super cool. I've had a few ideas on this so far:The most complicated involves drilling holes on each side of the barrel. The holes would be every inch the entire length of the barrel. On one side led's would be installed and wired in parallel to remain on constantly. On the other side photoresistors would be installed and also wired in parallel with a microcontroller. When the potato traveled down the barrel it would block the light to some of the photoresistors and the microcontroller would get a readout. If there was a way to program this whole system and get a graph on a computer of the acceleration/time curve, that would be awesome!! Another way would yield a less accurate number. Shooting the cannon straight up and timing how long it takes the potato to hit the ground would give you the initial velocity. Vf = Vi + Gt, so: -2Vi = -9.81t . Once the initial velocity is known, if the time it takes for the potato to leave the barrel can be figured out, the acceleration could be figured out.Let me know what you think!Note: I will attach images as they come.

Posted by intoon 11 years ago

super SPEEDY glue

Super glue. Good stuff. A bit slow sometimes. Baking soda speeds it up. But I want it clear.  I don't have accelerator. I think I could get some on the far side of town, but don't know someplace close to buy it. Internet says moisture cures it. I don't find this to be true. Internet says heat, air movement, UV.  At the moment, my project is sittin in the sun, which gives all 3 things, but there's no control group.  Qs What sorta place sells accelerator for cyanoacrylate? Which techniques have sped you along with it before?

Posted by Toga_Dan 5 years ago

rc car no longer accelerating?

Alright, so ive got this rc car, it runs off of a 7.2v battery pack and has variable speed and turning. it is not a hobby-grade car, but it is still something id like to hold onto. today, when i tried to drive it, i discovered it could not accelerate, forwards or reverse. it can steer fine, but trying to accelerate does nothing. ive ruled out the controller and the motor, which means the h-bridge and associated circuitry must be to blame. i tested the battery in another car of the same model (not mine), and all was well there. the h-bridge must be PWM controlled in order for there to be variable speed, so heres what im figuring: the motor is making a clicking noise when i pull the trigger on the remote, looking at the motor, it is turning very little and then stopping and then doing this again, at a fast rate. when it stops turning for that split seond it returns to the original position, because it has turned so little. i know the motor itself is fine, because i connected the battery straight to it and it spun up and turned the wheels. i have a feeling the issue lies within the PWM control. i cannot guarantee the receiver chip is fine but it seems kind of odd that it would be the part to fail; regardless i cannot find a datasheet using the numbers on the chip. if i were to try and look for an issue/failed part somewhere, where might you guys think i should start? there are a number of transistors on the board around the h-bridge, some capacitors, and a lot of resistors as well. i checked all the resistors inside the h-bridge and they are all the same value as the bands indicate, andthere are no corroded or cold solder joints. i plan to test the h-bridge on its own once i find a diagram i can reference to, that way if the h-bridge works i can rule it out and narrow the possibilities. if you need any more information please let me know.

Asked by zack247 5 years ago

Minecraft instructions

I'm seeing a large amount of Minecraft instructions lately https://www.instructables.com/tag/type-id/?sort=none&q=minecraft They seem to have appeared mostly in the last 6 months and at an accelerating rate. Are these within the scope of Instructables? Many of them are merely instructions on how to play Minecraft.

Posted by jurgemaister 4 years ago

I am leaving from my home I do not live on the highway so is there a break in between Step 2 and step 3 because I can't accelerate 2:55 until I get to the highway which would be about 5 extra minutes will this break the cycle

Asked by Jnard10 on How to Do BMW OBDII Drive Cycle for Smog Check 3 months ago

D.R.A.G.O.N

This is one of my brothers crazy contraptions, its called the Deadly Rail Accelerated Gun Of Neutralization, or DRAGON. Its ridiculously powerful, and shoots farther than my rifle. It is also the first dual-rail rifle system on the site, providing it with extreme accuracy and power.

Posted by Big Z 8 years ago

An article in PhysicsWorld reports on a novel technique for measuring the acceleration due to gravity. The researches used a cloud of ultra-cold atoms and bounced them off a series of upward laser pulses. By measuring the timing of the bounces they could measure g with better than 1 per mil precision.

Posted by kelseymh 9 years ago

Hi, can anyone explain how the Metro type works exactly and how i can modify it to change acceleration (PWM signal)? This would be awesome to use instead of having to use for loops and delay for it.I would be very interested on an update of this project or if anyone else has had success in doing som...

Asked by DanielS1076 on Control the Stepper Motor With Bluetooth 3 months ago

Is it possible to get the accelerometer data in the form of acceleration values from x, y, and z axis? I use the BlueSense app to change the accelerometer mode from Garage Door to Vibration. These are the images on the app when the sensor is static and where it is shaken. I was hoping I could record...

Asked by xanthoce on Monitor and Record Temperature With Bluetooth LE and RaspberryPi 2 months ago

What is better for a go-kart engine, petrol or electric?

If so where can I find a small, working, cheap one? if electric how can I recharge it. I live in Australia so I want no shipping of the engine. I also need a way of accelerating/braking. Can you help?

Asked by DarkVolt 8 years ago

Building a full auto coilgun

I've been working on this project for about a year now, the first stages of the design started like 5 or 6 years ago. It is a full auto 19 stage no-capacitor coilgun. The accelerator is 3ft long! It will use an advanced coil timing system that should allow more efficient acceleration. The custom 3d printed magazines will hold about 90 shots, maybe a little more. It should be capable of firing at a rate of several thousand rpm but I might tune it down to ~500 rpm to keep it cooler running and make the ammo last. If you want to read more about this design you can see the page on my website: http://www.ourbadscience.com/#!em-guns/cwjy Here is a video showing the current progress on the coilgun:

Posted by Jaycub 3 years ago

Hi, can anyone explain how the Metro type works exactly and how i can modify it to change acceleration (PWM signal)?This would be awesome to use instead of having to use for loops and delay for it.I would be very interested on an update of this project or if anyone else has had success in doing some...

Asked by DanielS1076 on Control the Stepper Motor With Bluetooth 3 months ago

Look out, Switzerland!

Tomorrow*, the Kite family are going to the land of cuckoo clocks, cartoon cheese and particle accelerators. We're visiting friends in Geneva, but if you're out there and the environs, and see a chap in a leather fedora and Robot shirt, or wearing a Robot lapel badge, stop and say hello. I'll give you stickers. (*Wednesday 6th - Wednesday 13th)

Posted by Kiteman 3 years ago

Cheap accelerometer?

Hello all, I'm building a textile interface using LilyPad Arduino and accelerometers to catch the movement and acceleration of points on this interface. As I intend to use a relatively high number of accelerometers (5), I've been wandering if there is any DIY accelerometer, or any cheap solution to it (as I'm brazilian, lilypad's accelerometers have a pretty high cost) . Thanks,

Posted by lgguts 6 years ago

Can I control the height of quadcopter using MPU 6050?

Is there a way that I can control the height of the quadcopeter using the MPU 6050? I know that the accelerometer and the gyroscope are used to measure the angular acceleration and the orientations respectively and stabilise the flight. But how would you measure the height of the quadcopter?

Asked by Bam Boy 4 years ago

Wimshurst Machine + Coil Gun = ?

I recently participated in my school's science fair. My project was about magnetic pulse accelerators(coil guns). I have been thinking about making a Wimshurst machine. Could I attach it to the coil of wire to get a very impressive result?

Posted by H20 6 years ago

Bite force transducer embedded in a gumshield

I am a quadriplegic and paralysed from the shoulders down. I am working on a project to allow me to control a go kart. I have limited use of my arms which should allow me to control the steering but I am trying to get another degree of freedom to control acceleration and/or braking One of the ideas is to use a piezoelectric type force transducer in the mouth to control and acceleration via an arduino or similar. The transducer would detect bite force and it would be converted into control signals for the throttle and/or brake. It would be embedded in a gumshield and it would be acceptable to have a cable coming from the front of it to the control System. I am wondering has anyone worked on such a project and could anyone point me in the right direction please. The gumshield may end up looking something like the image here.

Posted by greenonyx 4 years ago

Infinitely Variable Transmission?

Ok, so I have been looking at this thing called the D-drive and it inspired me to come up with my own IVT design which was solid gears for max torque handling and still could change speed and direction easily and smoothly. This is what I came up with and I would like to hear your opinions on it.  It starts with input to a differential, one side of which is inverted and the other isn't before returning to a second reverse powered differential.  The two sides are slowed using a fluid braking system which has a rotor powered by the side's drive-line, and a flow limiting valve to apply resistance.  As one side slows the other accelerates.  When there is no brake power on either side you have reached a powered neutral, and when the second side is braked the direction changes and accelerates. So, will it work? How practical is it? Are you going to say it sucks, then steal my idea?

Asked by jj.inc 6 years ago

Will it centrifuge?

I have recently obtained a desk-top centrifuge which has yet to be used. It takes tubes with a volume of 1.5ml, and subjects them to accelerations of up to 8500 gravities (by comparison, most theme park rides top out at 5 gravities).So - what should I put in it?I plan to collect ideas and then spend an evening or a weekend in the shed...Edit:First results are in.Blood!The Club Edition

Posted by Kiteman 10 years ago

need help on electric go cart

I have an idea for making a go cart with a in wheel motor, same idea as the volvo recharge My idea is to have electromagnetic "flaps" that can be turned on and off and i was wondering how i could turn them on and off precisely so i could control the acceleration and other variables I was thinking about using a hall sensor but i couldn't control very much about that so any ideas would be great thnx The flaps that i am talking about are a coil of wires, laminated, and i will have alot of them. then i would place them on a smaller wheel side by side. they need to be actuated so that if there was a magnet that is before it the coils will turn on and when it passes it will turn off, i would need to control the actuation of the coils so i could accelerate. And would a variable resistor be able to control the speed of the cart? Report Post Reply With Quote

Posted by squirt8500 9 years ago