Date: Tue Dec 18 15:02:14 2007

Author: John Welch

Subject: Re: High-Speed video of quarter lift

Post:
Great video Paul - it's going to reopen a debate we've been having here
about that demo.
Can you tell me what the camera was that you used, and roughly how much
one costs?
-John


Paul Nord wrote:
> Good Day,
>
> I'm having great fun with my high-speed video camera.
> http://www.youtube.com/watch?v=fC8q4S4t8Ts
>
> This is the demonstration where you blow across top of a quarter and
> cause it to lift up off a tabletop and fling itself into a cup. And,
> just to get people talking, I've titled the youtube release
> "Bernoulli's Principle". If you watch this frame-by-frame you can see
> that the quarter lifts straight up about 1/8" and then tips forward
> then backward before getting caught up in the air stream.
>
> It's a really startling demo to see in person. Just amazing in slow
> motion. Captured at 500 frames per second. Played back at 30 fps.
> Except for the third run through where it's played back slower. (I
> don't know how slow, it's just iMovie.)
>
> Paul
>
>

--
******************************
John Welch

Cabrillo College Physics Dept.



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