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Physics Forums's title: Physics Forums | Science Articles, Homework Help, Discussion

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On a paper by Udwadia and Kalaba
There is a highly ambitious article by Udwadia and Kalaba: article . To explain their main point, I will first recall the D'Alembert-Lagrange principle.
Assume we have have a mechanical system of particles with masses ##m_1,\ldots, m_\nu## and with positio...

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Is Our Universe Unique?
Hello, I’m going to start writing a book about multiverses and more. The first part is about the existence of other universes (sequential). Please write what you think and rate this part.

Part 1. Is Our Universe Unique?

Before we begin this topic, I’d like to define a few terms that I’ll be...


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Torque to turn a large Beam on a Rotisserie
Hi - I'm trying to design a Rotisserie for fabrication of large UC beams, and could do with some physics help if possible please.
The idea is... I'll create collars to allow a UC beam to turn on a set of rollers during fabrication process.

The largest item I have weighs in at 4225kg including...


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What Medium Does Light Travel Through in Space?
What is the difference between space and vacuum?
Since light waves require a medium to travel, then what is the medium in space?

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If your office coworker left their phone ringing on their desk...
... how long would you let it ring?

I just read about the Oxford Electric Bell which has been ringing away since 1840.
It's has been left in a corridor in the Clarendon Laboratory at the University of Oxford.
It was set up by Reverend Robert Walke...

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