Recent content by janzizka

Does anyone have a website which explains how to calculate the solar neutrino emission per second using the energies given in the p-p chain? thanks

Does anyone know of any books with problems in nuclear physics and cosmology? I'm looking for a book that provides clear solutions as well. thanks for your help

how would overflow start a fire? i mean if everything in the oven is at 350 then where does the temp build? and not to sound like i didnt hear about the radiation... but isn't that more microwavish? standard (old) ovens just produce heat in some conventioinal way...

until the ball leaves the sphere, you have N + mg = ma however, while it is on the sphere it is undergoing circular motion, hence F = m (v^2)/r so at the exact moment the ball leaves the sphere, n = 0 and a = v^2/r mg = m(v^2)/r so you can find the velocity at that moment. then you have to...

That's true, and I hadn't thought of that. But black hasn't exactly made an "illegal" move because it hasn't made any move at all, the board is just not set up correctly for playing on a torus.

Tom McCurdy's reply was actually what I had in mind, though it is easier to phrase it as a chess game on a torus. The solution with the mobius strip works as well. It's true that both sides will be in checkmate, but in chess the first side which cannot move loses, and since white must go...

I am not considering the application of any physical forces (such as gravity)

the condition is on the board, not the pieces (or moves). I also have a spoiler, but I am more interested to hear your ideas without a give away.

This is a chess/math puzzle I invented: Consider a fully set up chess board (in starting position). Invent a condition (new rule) in which black wins without either side making any moves. Note: this problem has a really abstract and *topological* approach. :smile: Please email me...