Re: Getting power to a rotating table

On Fri, 30 May 2008 00:01:39 +1000, "Ian Macmillan"
<iandmac@xxxxxxxxxx> wrote:


I'm not sure if it is related, but if you place an object, say a coffee cup,
on the palm of your right hand facing forwards, then turning your hand
towards your body to point back, and then, still turning, raise your arm and
hand above your head around and down until your hand faces forwards again,
all with your palm up and the object still in place. You can continuously
rotate the cup without twisting your arm off or spilling the coffee. Try it!

from arxiv.org/pdf/astro-ph/0110161:
Mirror objects in the solar system? by Z. K. Silagadze
"The trick was invented by Balinese candle-dancers long ago and
performed countless times without realizing any deep mathematics
behind it. In presence of the more scientifically trained audience the
trick was firstly performed by Feynman during his 1986 Dirac memorial
lecture [5]."

[5] R. Feynman and S. Weinberg, Elementary Particles and the Laws of
Physics: the 1986 Dirac memorial lectures, Cambridge University Press,
1987.

Not off topic at all! Back to basics.

John

.

Quantcast