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44 Challenging problems. Many are quite difficult, and tests if your physics understand is solid enough!
This is a tutorial on arXiv about how negative refractive index emerges.
Hi all, I am a Physics teacher from VC, N.T., HK.
Currently I am thinking about how to build a database for all my question bank. In this discussion I would like to post the difficulties I met and progress I made. Feel free to comment on anything here.
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In this How-to, I would like to demostrate how to use Lagrangian formulation for system with non-conservative force. The problem that I am going to solve is a particle on a cone (or any landscape with height which depends on the distance from the origin). It will be subjected to resistance which is proportional to it's velocity.
I will first ...
