How would you make a clock

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For physics i have to make a timing device that can time up to 45 seconds and be accurate to the second.

a quarter of the grade is on how creative it is so ive been racking my brain for cool ways to measure time and so far i haven't got much

ive thought of draining something and having a seconds scale on the side but thats pretty boring and simple

the example that my teacher showed us was a really long tube filled with corn starch except for a little bubble and time was measured by the bubble rising.

anybody got any awesome ideas?

Sep 22 2010 11:11PM

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.JPolster

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Use the refresh rate of an old video

Sep 22 2010 11:14PM

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123+ski

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put water in a buret, and have it drip into a beaker below it. have the beaker on a scale or some other sort of balance, so thats the weight increases with more water, the other side will move up. mark the other side with tick marks for seconds.

thats the best i can do now, see how far that gets you or research roman water clocks, or something similar

i'll let u know if i think of something better

Sep 22 2010 11:15PM

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PeterWojnar

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Tonight, count how long it takes you to ejaculate while having sex.

If it's under 45 seconds, I'm sorry. Work on it.

Get consistent in the timing of your in-out-in-out motion, and figure out how long each in-out is, in milliseconds.

Then when you're timing something, have somebody count how many times you thrust while having sex until the desired amount of time has been counted. Multiply the number of thrusts by the average length of one thrust to determine time.

Bonus points if your teacher is involved.

Sep 22 2010 11:18PM

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skithesprings

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haha, i would have given anything to slam my physics teacher in HS, she was a dime.

just make an hour glass. then you just have to add and take away sand until it takes 45 seconds for it to go through.

Sep 22 2010 11:22PM

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andreweckels

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haha good ideas guys

also it can't be electronic

and the way the teacher tests it is he give a time between 0 and 45 seconds and we start our timers at the same time and i have to tell him when to stop

Sep 22 2010 11:26PM

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Abc567def

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what about something and the transference of air like two balloons that expand a scale from zero to 45 so that when one is empty the other is full and visa versa. You could possibly use some sort of compression like a tray with sand being poured onto it which would then be ontop of the balloon to change the amounts.

Sep 22 2010 11:32PM

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andreweckels

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yes i did mean corn syrup, and to your previous idea i don't think i'm allowed to use a calculator because it is supposed to be something you could make way back when

Sep 23 2010 12:15AM

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nopu

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in the ghetto?

Sep 23 2010 12:16AM

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thugaim

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Sep 23 2010 12:39AM

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thugaim

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I have a very basic understanding of how you'd do it, i just wanted to post that picture.

Sep 23 2010 12:42AM

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molsongolden

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VERY CAREFULLY

Sep 23 2010 12:43AM

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soulskier

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/\/\/\/\/\/\/\/\//

Sep 23 2010 12:44AM

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soulskier

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turn your comp/head sideways....now have a ball roll down in 3 second intervals

Sep 23 2010 12:45AM

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Malcolm

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get a friend to time it and text you a bit before 45 seconds. then just stare at a plant or something and amaze the teacher

Sep 23 2010 12:47AM

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Skibumsmith

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Sep 23 2010 12:54AM

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LittleFoot

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and theres a lot of bumps everywhere so the ball will just fall off the side

Sep 23 2010 1:00AM

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TOK

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Sep 23 2010 1:01AM

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An10a_Eng

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i would use a crystal oscillator or 555 timer to create a 1 Hz square wave then use 74161 counter chips and simple logic gates

Sep 23 2010 1:02AM

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soulskier

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uuuuuuh, ball hits next ramp, stops and starts again...

Sep 23 2010 1:03AM

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Skibumsmith

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fack! it took me like 5 minutes to draw that. and i still don't understand why it wouldn't work.

Sep 23 2010 1:04AM

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icon1234

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Never really was fond of physics in high school, and I don't need to take college physics till next year. But something that came to my head, ( no idea if it would work fyi) you could fill a container with water or some substance, then make a nozzle so it would release the water at a constant rate. Figure out the amount of water needed so that it would be empty by 45 sec mark.

Good luck.

Sep 23 2010 1:08AM

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Gnarwall

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Dude just do the double soda bottle stacked thing. I did it morning of, took 5 minutes. Just make sure it doesn't look like shit and you'll get an A. And make sure the top bottle isn't tilted sideways, that threw a few people off last year. Save your creativity for the submarine, that things a bitch.

Another thing you can do is plastic Tube wrapped around a big poster tube, with a ball bearing to roll down it. My sister did that I think...

Sep 30 2010 12:38AM

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