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Coinstar vs. the Kitchen Scale - adventures of programmer with screwdriver
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Subject:Coinstar vs. the Kitchen Scale
Time:05:44 pm
How much was in those change jars on top of the fridge? I weighed the coins and then ran them through the counting machine at QFC.

Coin Weight Mass ea. Est. by wt Coinstar Diff.
Quarters 621 5.670 110 = $27.40
Dimes 742 ± 3 2.268 327 = $32.72 328 +0.3%
Nickels 1212 5.000 242 = $12.12 243 +0.4%
Cents 3251 2.500 1300 = $13.00 1243 -4.4%


Pretty close really. Older pennies have been substantially heavier so that's probably why the penny count by weight was high.

I didn't run the quarters through the machine since I use them for laundry. Sadly, despite the Beach Boys' financial planning advice, $47.72 is not enough to buy a sporty new Chevy.

I guess I could also have stacked each coin type (slid them into a v-shaped groove in something (quiet, [personal profile] m_pig)) and measured their length. That might have been better for the pennies.

Other things found in the change jar: two Eisenhower half-dollars, one bicentennial; some Canadian quarters and Japanese 50-yen coins; and an Australian two-cent piece which appears to have a firelizard on the back.

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marzipan_pig
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Time:2014-07-05 01:15 am (UTC)
I feel like I need a shushing on the 'measure their length' bit too after the 'v-shaped groove' you're sliding things into.

You should drill a tiny hole in the fire lizard one and wear it as a pendant!
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randomdreams
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Time:2014-07-05 05:33 am (UTC)
Now I'm thinking of other interesting, improbable ways of counting them. Immersing and measuring the volume. Pouring them out in a stream past a high-speed camera.
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beaq
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Time:2014-07-05 05:43 am (UTC)
Laying them in a row and measuring its length.

Oh, you said interesting.
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randomdreams
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Time:2014-07-05 02:34 pm (UTC)
I'm trying to figure out some way of hitting the whole thing and measuring the frequency at which it rings, but that may be Too Interesting.
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beaq
Link:(Link)
Time:2014-07-06 01:10 am (UTC)
Vaporize them in a calorimeter? You'd have to do the Coinstar part first, though.
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randomdreams
Link:(Link)
Time:2014-07-06 04:43 am (UTC)
One of us is going to work a megawatt laser into the conversation.
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hattifattener
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Time:2014-07-05 03:05 pm (UTC)
Hm, what other properties do they have, other than volume, mass, size along various axes…

Could heat and cool them and measure their heat capacity. Or somehow measure the permittivity or reluctance of a boxful of coins. Or see how quickly they react with or absorb some chemical?
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randomdreams
Link:(Link)
Time:2014-07-05 03:57 pm (UTC)
Ooooooooooh. Weigh them accurately, then pour in a bunch of mercury and let it sit, pour it off, and reweigh, which should tell you how much copper is in there.
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katybeth
Link:(Link)
Time:2014-07-05 04:02 pm (UTC)
Hard to get a subsequent Coinstar comparison.
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randomdreams
Link:(Link)
Time:2014-07-06 04:49 am (UTC)
I suppose you could bake the mercury off afterwards. I'm sure that nothing could possibly go wrong with THAT.
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eub
Link:(Link)
Time:2014-07-06 07:51 am (UTC)
Use them to pay the doorman's salary, and measure how long he remains on the job before declaring that you owe him back wages.

Rob the coins from the doorman, and observe whether you are charged with a felony or a misdemeanor based on the amount of money. Perturb the amount; repeat.
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randomdreams
Link:(Link)
Time:2014-07-06 05:07 pm (UTC)
Okay these made me laugh out loud.
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rubricity
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Time:2014-07-05 07:56 am (UTC)
about ten years ago I realized my purse was awfully heavy and that might be why my shoulder was hurting. I looked in my purse and realized I had an awful lot of change floating around the bottom. so I took it to coin star and ended up with about $70. I did the math on the weight and it was just shy of 7lbs.

my current coin program funds my purchases on iTunes. I dump any coin change I get into the "ashtray" in my car. when it is full, I take it to coinstar and use the money to get an iTunes gift code. I did this two days ago and got about $16.50. takes two to three months to fill up the "ashtray" which I now dub "cointray".

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jinian
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Time:2014-07-07 12:31 am (UTC)
Thank you, I was wondering! Sorry to have missed the 50-yen pieces, since I think I have all the other Japanese money (and will take it to get changed RSN, wish the money-changers at the airports had been open), but I'm glad you have the 20+-years-obsolete wonderful Australian 2p!
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Coinstar vs. the Kitchen Scale - adventures of programmer with screwdriver
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