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/diy/ - Do-It-Yourself

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Anonymous 05/22/14(Thu)03:48 UTC+1 No.641487 Report

For my AP Physics final I must design a clock that can find time to the nearest tenth of a second. The clock must be built without any type of electrical, chemical, or biological components.

The clock has to be adjusted to find a time between 10 and 30 seconds ex: 11.6s.

Then readjusted to find a time between 1 and 2 minutes ex: 95s.

The only ideas I've come up with are a pendulum and some sort of water dripping type mechanism. The period of the pendulum would help me deduce where I'm at for seconds, but I have no idea how to get it down to tenths of a second? Any ideas?
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Anonymous 05/22/14(Thu)03:50 UTC+1 No.641489 Report

a bunch of pendulums?
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Anonymous 05/22/14(Thu)03:51 UTC+1 No.641490 Report

>>641489
It has to be one device.
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Anonymous 05/22/14(Thu)04:11 UTC+1 No.641499 Report

>>641490
I would use a pendulum with an a solid arm and an arc underneath that was notched or marked. Possibly set a gear on the axle or pivot that it rotated on, that could be locked into place when a lever was raised or depressed. The gear could also be used with a ratchet device to tick over placards that marked how many swings the pendulum had made. Use a formula to mark how many seconds are in a swing. Use the arc to find how far into a swing you were.

Or use a funnel that pours sand into a beaker of liquid. Use a ratio of displacement vs time as your marking standard.

Just throwing ideas out there. No clue how feasable they are.
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Anonymous 05/22/14(Thu)04:15 UTC+1 No.641501 Report

>>641499
Yea, I was thinking about using the period formula for a pendulum to determine the amount of time it takes for the pendulum to swing, but I don't know if Air resistance would have to factor in somehow. The arc is a good addition, and if anything I can ball park it and probably get at least a C.
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Anonymous 05/22/14(Thu)07:35 UTC+1 No.641574 Report

Make a mirror, and face it towards an accurate clock existing in the room you show it in.
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Anonymous 05/23/14(Fri)08:30 UTC+1 No.642002 Report

put the thing on long legs, and hang a bucket of sand on a string wrapped around an axle that spins to power the gears
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Anonymous 05/23/14(Fri)09:15 UTC+1 No.642019 Report

>>641487
>+
sundial with tick marks at the second mark.
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Anonymous 05/23/14(Fri)09:16 UTC+1 No.642021 Report

>>641487
maybe a least common multiple setup?
Pendulum 1 has a length of A, pendulum 2 has a length of B
They're both released at the same time, and the next time they're in sync some amount of time has passed
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Anonymous 05/23/14(Fri)11:13 UTC+1 No.642056 Report

>>641501
In lower division (undergrad) physics you always assume air resistance is inconsequential anyways. Accuracy and simulations should be reserved for computational physics.
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Anonymous 05/23/14(Fri)11:19 UTC+1 No.642058 Report

dude, how can you not work this out?
a fucking egg timer.

like sand through the hourglass, these are your shitty grades.
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