jmcozine at yahoo.com
Wed Feb 12 20:49:38 PST 2003
steveb at creek-and-cowley.com (Steve Bougerolle) writes:
> On Thu, 2003-02-13 at 05:49, James Cozine wrote:
>> I did a lab in high school where one determines the acceleration due
>> to gravity by swinging a pendulum. The result should have been 9.8
>> m/s^2, but we got 8.8 m/s^2. I still don't know what we did wrong.
> The short answer is probably "you did it in high school." :)
I know, I know ;)
> That particular experiment usually has quite large uncertainties
> attached to it, actually - especially if you aren't careful about it.
It's a simple equation, with three variables:
T = 2 pi sqrt[L/g]
L is the length, known prior to the experiment, and T is the period,
the whole point of the experiment. Just solve for g.
The length is pretty hard to get wrong. It was determining the
period that was fscked up. The ``laser'' was probably aimed wrong,
or something. It was years ago. I'm just sorry I lost the report;
it proved that place was possessed ;)
(Not that this adds to the discussion; I just like this thread much
than the other recent ones.)
"It's not the despair... I can stand the despair. It's the hope."
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