In article , "Bonnie Granat"
writes:

What I still don't understand is why, if the pendulum is attached to the
building, it doesn't just move along with the building!
Do you know, Cindy? Funny meeting you here!

It's a small Dyson Sphere, after all :-).

Alas, I haven't the faintest idea. I'm hoping some astronomer or
astronomy major will enlighten us.

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___________________________
Bonnie Granat
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"SPAWN OF A JEWISH CARPENTER: CINDY SMITH" wrote in
message ...
I'm reading an introductory book on astronomy called _Discovering
Astronomy_ by William H. Jeffrys and R. Robert Robbins. On page 7 is
a description of the pendulum experiment by Foucault in 1851 designed
to prove that the earth rotates on its axis. Theoretically, the
pendulum should rotate opposite to the Earth's rotation. Question 9
asks: "Why doesn't the plane of oscillation of the pendulum rotate at
the equator?" I don't know the answer. Can anyone tell me why?

Thanks.

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Cindy Smith Unless the LORD build the house,
they labor in vain who build.
Unless the LORD guard the city,
in vain does the guard keep watch.
Me transmitte sursum, -- Psalm 127:1
Caledoni! All your base are belong to us.
A Real Live Catholic You are on the way to destruction.
in Georgia! What you say.
- - Go against the flow! You have no chance to survive make your
time.

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Cindy Smith Unless the LORD build the house,
they labor in vain who build.
Unless the LORD guard the city,
in vain does the guard keep watch.
Me transmitte sursum, -- Psalm 127:1
Caledoni! All your base are belong to us.
A Real Live Catholic You are on the way to destruction.
in Georgia! What you say.
- - Go against the flow! You have no chance to survive make your time.