Why do i solve the sum in this way (mathematics)?

The sum is as given below: "There are two cars A and B.They start from the same point at the same time and travel in a circular path .Car A can complete one round in 18 minutes whereas car B can complete the round in 16 minutes. After how much time will they meet?"   my maths teacher told me to take the LCM(least common multiple) of their respective completion times of a round. Can anybody please explain to me as to why i should take the LCM. Also i would be greatful  if you could explain it simply.Cheerio.

Question by Strontium 5 years ago  |  last reply 5 years ago

Favouriting option will be taken away?

Okay, just wondering, it says that favouriting is pro-only, but I don't have a pro account and I can still favourite things...?

Topic by A good name 9 years ago  |  last reply 9 years ago

If you've taken guitar lessons...?

How well could you play after 2 years of lessons and practice.  Did you have any music experience before starting.  What was your musical ability or talent?  Did you sometimes feel like you were beating your head against the wall?

Question by Re-design 8 years ago  |  last reply 7 years ago

If i post this instructable, will it be taken down?

I'm planning to put "How to rapidly produce hydrogen gas (faster than electrolysis)"

Topic by IlluminatedAntichrist 12 years ago  |  last reply 12 years ago

Has anyone here taken a Coursera course.

I am curious, has anyone taken a Coursera course (https://www.coursera.org/).  They are free online courses.  I was interested in trying it out but wanted to see if anyone else has had any experience with them.  I have never taken an online course before so this is pretty new for me.  I would love to hear from anyone who has tried it.

Topic by ChrysN 6 years ago  |  last reply 6 years ago

Collection of books taken to preserve human knowlege

What books file would you take to preserve most of the knowledge of the human race? You have a 64 GB flash drive and durable, waterproof laptop capable of getting power from an hand crank used to view files. What would you put on it? My list: Wikipedia and wikimedia stuff. 10 GB Bible and Collections of various philosophers   Korean, Eastern philosophy and major literature Native American culture and method information Database of major languages, dictionary, and grammar rules Instructables, selected ones Some major works of literature from project Gutenberg Songs from Beatles, Micheal Jackson, Elvis, Queen, ABBA Selected Movies Scientific Data, and other information vital to rebuilding society, such as designs for factories and computer chips.  Pictures of major works of art That's my list, what's yours?

Topic by starwing123 9 years ago  |  last reply 9 years ago

movement decision taken upon the light seen by a robot

I'm working on a line follower robot and it has to check traffic lights every estimated distance and a decision of whether to move or wait is to be taken upon the current state's light of an external traffic signal [ green to move..etc ] it has to be done without the help of a micro-controller i couldn't find a color sensor without the usage of MC. however i managed to find a only one color detector using an LDR and a LED with the given color. could this sensor help in my project ? moreover the robot will have to check two traffic signals at the same time and will move only if one of them is green [ if both are green it will have to stop ] should i connect Green1 & Green2 states of the two sensors to an XOR gate or there is  a more appropriate way ?

Question by superdz 3 years ago  |  last reply 3 years ago

Why did the Answers link get taken off the navbar? Answered

I think it's a great feature and that it should be showcased.

Question by revelae 9 years ago  |  last reply 9 years ago

what can I do with a screen taken off a mobile?

I just obtained one screen from the sony erricson mobile. it is in perfect condition..... What can I do with it?

Question by The Pencil Guy 5 years ago

What names for Linux aren't taken that relate to the color blue?

I would like to know so I can create my custom distro. I would also like to know what is the issue with my UCK Ubuntu Customization Kit? https://answers.launchpad.net/uck/+question/251475

Question by nerd7473 4 years ago  |  last reply 4 years ago

how can I rotate a picture taken with my iphone?

Hi, I already had this problem before, and I have no idea how to solve it - I took this picture with my iphone. It rotates the picture automatically on the phone, but when I try to upload it to the website it's not rotated. When I try to rotate it again before uploading it doesn't work either.  Thanks! Merav 

Topic by nemalim 6 years ago  |  last reply 6 years ago

Someone copied my instructable and taken part in same contest

HelloI submitted my first intructable Make Compact LED Lamp (CLL) from a Compact Fluorescent Lamp (CFL) on 2nd June 2009. Link to my intructable is https://www.instructables.com/id/Make-a-CLL-from-a-dead-CFL/I also taken part in contest Get The LED Out. Today while I was browsing entries for that contest, I found an entry which is a COPY of my intructable. Link to that instructable is https://www.instructables.com/id/COMPACT-LED-LIGHT/Only some differences are there in both instructables. That person submitted instructable on 11th June so it indicates it might be a copy of my instructable.I wonder how judges allowed that intructable to enter in contest.What to do now?

Topic by electrosam 9 years ago  |  last reply 9 years ago

On/off switch soldering help for a "taken apart" mp3 player.

Hi all, So i'm currently trying to do one of the instructables right now, which calls for taking apart an mp3 player and (in my particular case) unsoldering the on/off switch and replacing it with another switch (an SPDT switch). The trouble is, I've never messed around with something like this before, so I'm not really sure what I'm looking at. I'm wondering if anyone more experienced with electronics/soldering would be able to help me out. I just want to know what I'd have to unsolder to get the switch off of the board, and if there are any suggestions as to what to expect when it comes off. Looking at it up front there seems to be two metal solder points on either side of the switch, and three small flat rectangular metal things sticking out from the side opposite of the switch itself. I'm not sure if those are soldered or what they do. Can someone help me?

Question by mrbenku 7 years ago  |  last reply 5 years ago

What is a process that can be run on a computer cluster that displays the time taken?

For my science project this year I need a process that can be run on a computer cluster and that displays how long it took to process. The time needs to remain fairly constant yet be accurate enough to display variations in processing power. For example, let’s say that there is a computer with 4 GHz of processing power. if i were to repeat the same process multiple times then the time taken would be something like 2346765.4567865676 seconds the first time and 2346765.4567865681 the second time, so it would only slightly vary each time. if the processing power would change to 3.95 GHz then the time would change to 2346765.45679 so that variations in the processing power would be evident in the time taken. These are just examples and the values have nothing to do with my actual project but i need something to process with these characteristics. Please ask if clarification is needed.

Question by danielemur 7 years ago  |  last reply 7 years ago

Pimples? Answered

What are the percaution taken for the pimples?

Question by 10 years ago  |  last reply 10 years ago

Can I make from an taken-out plasma-ball an plasma-speaker?

I have take out the glass-globe with the gas from my plasma-ball. Can I make it to an plasma-speaker? p.s. i'm from germany, so i apologize for mistakes ;-)

Question by Gujkil 8 years ago  |  last reply 7 years ago

In the spirit of Halloween - pictures taken of folks getting REALLY scared in a haunted house

This is one of my favorite things. I shared with with the Instructables office today, and I think all of y'all need to see it to! Just go here when you have some free time. Don't click when you are supposed to be doing something else. It will kill your productivity. :D http://www.flickr.com/photos/nightmaresfearfactory/ They have a tumblr and facebook page too, for even more fun!

Topic by jessyratfink 6 years ago  |  last reply 5 years ago

Taken - Free Boat - Blaze of glory, 24ft wharram-style hull trimaran

The boat has gone on to its new home now, hopefully they'll post their adventures and mishaps!here's the history of the boat.http://www.dilworth.org/writings/now.shtmlTo give away to good home, or rather for sale for $2 (two u.s. dollars).It comes on a roadworthy trailer but you'll need your own trailer plate.It's in Alameda California.post in the comments as to why you'll actually have a use for it and how soon you can take it away. Include your email address and phone# so I can contact you.Don't be discouraged by the proposals already here, none of these people has managed to take the boat yet. Get permission from your wife or girlfriend ahead of time.thanks,tim

Topic by TimAnderson 11 years ago  |  last reply 10 years ago

What do I do with a still-working old handheld that was taken apart?

I have a retro Tiger Electronic Handheld Baseball game circa.1993-95 like the one somebody else listed here http://cgi.ebay.com/BASEBALL-Tiger-Electronics-Vintage-Retro-Handheld-Game-/300442084519?pt=LH_DefaultDomain_0&hash;=item45f3be64a7. While wiping the dust off, I forgot to switch to an alcohol wipe instead of my Murphy's Oil/Water rag and took it apart to dry it out. Now all the pieces in the itty bitty screen won't go back together right. I'm pretty sure the thing still works if I could just reassemble it. Any recommendations on what to do? Or can I just list it as "FREE" on craiglist or a yard sale to anyone that wants to play with it or use it for parts? Sadly, I no longer have the original package or instructions.

Question by StoryAddict 7 years ago  |  last reply 7 years ago

Do crystal radio's work when 'digital radio' has taken over?

For the past couple of days I have been interested and reading about crytsal radios. Having many issues recently, I do know that our radio stations here in Australia went to 'digital' and they removed analog T.V, but I never heard anything about radio. I can still pick up AM radio stations on the radio or in the car, but are these signals sent differently that a crystal cannot pick up? I attempted 2 versions of a foxhole radio, no luck at all there. So I went to Jaycar and bought this: http://www.jaycar.com.au/productView.asp?ID=KV3540 This proper PCB, with a galena diode still does not work. It also doesnt use a ground. Unless my aerial needs to be bigger which I doubt! I am using a 30ft spreader aerial. Later today I will stand NEXT to a radio station building which is only 2km from here, if it does not work, then no crytal radio works over here anymore which would really suck! How could they remove it!? And if I am wrong about the crystal stuff, then im still mad that the analogue technology has been removed anyway. It should sit there for anyone to explore.

Question by AtomRat 6 years ago  |  last reply 4 years ago

taken hovercraft as final year project need some strong data plz help reply @ramiz.kazi1@gmail.com?

I am final year engineering student .i have taken hovercraft as my project & m planning to built a hovercraft with thrust & lift fan that can carry a load of around 250 lbs .can anyone help me with details about how much power engine will be needed help plz

Question by horriss 9 years ago  |  last reply 9 years ago


I'll be old and gray before I'm able to use all the wonderful PRO Membership time I have in the bank. Paying it forward. Four 1 YEAR PRO Memberships up for grabs. Please allow those who do not currently have memberships to take advantage of this offer. Enjoy! Leave a comment, and if you are not currently subscribed, I'll send a link to you for a free trial membership. It will be your responsibility to use the code within a reasonable amount of time. It will be up to you to create an account and follow all of the terms of agreement with Instructables. I'll check back in a bit, and then send codes out to the lucky four! We hope to see Instructables from you, too. Would you do a favor for me? Check out my latest Instructable, please? :-) https://www.instructables.com/id/Beef-and-Peppers-in-an-Edible-Bird-Nest/ As of this posting, there are only two left, folks.

Topic by WUVIE 4 years ago  |  last reply 4 years ago

What kind of bug is this? Answered

I saw this on a window and snapped a shot.  Taken in Tucson, Az

Question by onrust 8 years ago  |  last reply 8 years ago

If I post a picture????

If I post a picture of the remains of a pipe bomb, will my instructables be taken down?

Topic by IlluminatedAntichrist 12 years ago  |  last reply 11 years ago

Thin lines distorting my images in my Digital camera?

When I use an external power source in my Canon Digital Camera the Image taken by flash is full of  thin Gery horizontal lines. These lines do not come when photo is taken in daylight. Only the Flash Photo is effected. WHY?

Question by Dipankar 8 years ago  |  last reply 8 years ago

Ask : can i turn a motor from a fan to a generator ?

I have a motor taken from a fan ( picture ) i want turn it into a generator. Can i do that ? My teacher said that the motor taken from a fan could not be turned into a generator. And if it is possible, how to do that ? thank you a lot

Topic by Phờ roenP 4 years ago  |  last reply 3 years ago

How to remove backups? Answered

I just updated my old computer to service pack 3 and I noticed that when it was going through the update proses that it was backing up my commuter. Once it had finished updating and it had been restarted. I checked to see how much space it had taken from my small 10 gb harddive and found that the update had taken up around 3.5gb of my hardrive. I is the huge amount of space taken up the fault of it backing up my hardrive? If so how can I remove just the backup?

Question by coolpizzadude 8 years ago  |  last reply 8 years ago

Someone copied my intructable.And taken part in same contest in which I took part.What to do ?

HelloI submitted my first intructable Make Compact LED Lamp (CLL) from a Compact Fluorescent Lamp (CFL) on 2nd June 2009. Link to my intructable ishttps://www.instructables.com/id/Make-a-CLL-from-a-dead-CFL/I also taken part in contest Get The LED Out. Today while I was browsing entries for that contest, I found an entry which is a COPY of my intructable. Link to that instructable ishttps://www.instructables.com/id/COMPACT-LED-LIGHT/Only some differences are there in both instructables. That person submitted instructable on 11th June so it indicates it might be a copy of my instructable.I wonder how judges allowed that intructable to enter in contest.What to do now?

Question by electrosam 9 years ago  |  last reply 9 years ago

how can i make a motor taken from an old CD drive turn at 1RPM for my CCTV camera? i want to rotate my cctv Camera so ?

I want a motor for my CCTV camera so it rotates at 1RPM old CD Drive motor i have please help me control its speed

Question by grcnu 8 years ago  |  last reply 8 years ago

When Was It Posted??

Is it just me, or did the instructable "Posted On" date get taken off of the pages? Why? Just curious, Jeff

Topic by AptPupil 3 years ago  |  last reply 3 years ago

Help with iPod Touch Storage?

I have an iPod Touch(4th gen, 8GB) and I've noticed a few discrepancies in the storage. When I add up the space taken up by my 'stuff'(apps, music, etc) I get about 1.6 GB, but the thing on the iPod say I've taken up 3.4 GB. Is this normal, and if not, what can I do about it?

Question by black hole 6 years ago  |  last reply 6 years ago

what do i have?

Ok i have had a fever everymorning and then goes away later(i have strep but its getting taken care of) but do i have a bug,a virus,swine flu,flu,etc

Question by knexsuperbuilderfreak 9 years ago  |  last reply 9 years ago

Results of ideas turned in

Has a decision been taken on going ahead with implementation of ideas turned in? Would it be posted on the forum or will an email be sent? Am anxious to know!

Topic by robot_challenge 11 years ago


Weissensteinburg, has taken the place of members who you wouldn't think to take over the forums... That list including, Goodhart, Killerjackalop, and GorillazMiko.

Topic by bumpus 10 years ago  |  last reply 10 years ago

Seeing-eye cane

One of the iRobot entries was an excellent idea to turn it into a seeing eye cane.I'm afraid somebody has taken the idea further.

Topic by Kiteman 11 years ago

diy drones contest not taking me in!

My instructable has not been taken in one contest for days now what should i do!?

Topic by pawanvs99 5 years ago  |  last reply 5 years ago

Nightmare coaster finished

This way over due. This coaster has been built and taken apart all ready. Here is it's video.

Topic by GTRPLR1995 9 years ago  |  last reply 9 years ago

Do you know if you can still record video with a camera taken out of a phone? If so, how? Answered

Me and my friend are doing a project. Help?

Question by hmfoster 7 years ago  |  last reply 7 years ago

Is your Bottom made out of Iron? Ever taken a Serious motorbike trip? Daytona? Sturgis? The Big Easy?

Ok, a friend (one of our church members) has asked me to come visit. He's got a contract flying Choppers and Cropdusters for the next two months. We used to eat breakfast together about three times a week when he was in town, and he said if I'll ride up there, he's buying. Problem is, he's 500 miles away. I can't afford to drive the Tahoe, and I don't trust my crackerbox (18 year old Mazda). I think I'm going to take the Goldwing. I've never really ridden more than about 200 miles in a day, but I'll only have about 3 days to make this voyage (1000 miles round trip). What do you think? Is it do-able for a sleep deprived, rapidly-aging, and slightly-overweight desk-jockey?

Topic by skunkbait 10 years ago  |  last reply 9 years ago

need low- tech medication taken/counting device,multiple strands , like a ranger klic bead counter

I have tried many of the sync programs including telephone call in reqall syncing with evernote. i may have to give that i try again, but there are times i don't have my phone /itouch within arms reach, I also have had problems where the syncing in evernote seems off and i need to keep a better count of pain meds,One is an extremely powerful very fast acting buccal tablet.. 5 to 15 minutes for breakthrough pain. Due to the change in pain daily and sometimes extreme breakthrough pain, my cognitive mind is shot and i am still trying y best to keep my daily count accurate, and counting helps me try and lower it by changing my activities. My ability to focus and write has gone downhill.. i have one med i may take 3 times a day at 10mg, or many times try and break it up to more frequent times but same dose, rather than 10mg(2 tabs) at one time i may take 5 and 3 hours later take the other 5 mg, i do this to avoid the side effects of the other meds, so i don't get as sleepy ,lethargic, i have another med i take usually 4 times a day, but sometimes 6 times and difference lucky 3 times.. so i need a 3 to 6 string. Another med i take usually 3 times sometimes 4, and may also break them in half it avoid the sleepiness,, that would be a 3 to 5 beads. i also have another that i may take 1 a day or 8 a day, that is the one that ruins my memory, so lately only taken before sleep, since 30 minutes after taken it , i will forget, and have done things like put the bottle in different places or turned it upside down, but doesn't help wherein i am out. Needless to say mu cognitive mind is very bad. i have plenty of leather and different beads so i have the supplies. i cant figure out how to do it, and since i have million things to do, 2 years behind schedule with a lot of medical procedures that take hours to do. plus need to figure out how to modify equipment so it works better for me. I cant focus on how to make this simple Aztec/Inca counter . I know it is simple, which kills me to ask, but i hate waking up dead. Which has almost happened too many times., i have to get ready for doctors so excuse any grammar errors please. thanks in advance , i lose my pens and papers all the time so that method became unreliable. i figure beads that i can snap on my belt loop would be the best fix.. A bead counter for one strand and i should be able to figure out the rest. i hope  

Topic by escapefromyonkers 7 years ago

ACT Test

Sometime soon i am going to take the ACT test. Has anyone taken this test and know of anything it asks about that i might need to learn?

Topic by wingman246 11 years ago  |  last reply 11 years ago

What is this component? Answered

I've taken apart a LED lighting panel and A have some resistors and LED diodes. BUT, I also have this other component that I don't have a clue what it is....

Question by thomas9666 8 years ago  |  last reply 8 years ago

google play

Anfroid market has been taken over by a program called "playstore" by google. the name is so much dumber than before. it would be fine as google market.

Topic by modaawesome 7 years ago  |  last reply 7 years ago

Huge Servo?

I read the instructable on how to turn a servo into a a geared motor, but with that board that is taken out of the servo, could you attach that to any motor and make much larger servos? kc

Topic by kcedgerton 9 years ago  |  last reply 9 years ago

My avatar got tooked!

My avatar was brutally murdered and then taken away from me in the night *sniffle* i demand justice! i call for a rebellion!

Topic by Danny 11 years ago  |  last reply 11 years ago

How do I make a mousetrap powered airplane?

Need plans or adaptable plan taken from mousetrap powered car.

Question by 10 years ago  |  last reply 8 years ago