Download PDF by Christoph Schiller: Motion Mountain – The Adventure of Physics. Light, charges

By Christoph Schiller

A latest creation to physics,captivating, basic, with many color photos, animations and movies, riddles and challenges.It covers mechanics, thermodynamics, relativity, quantum physics and smooth makes an attempt at unification.

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Additional info for Motion Mountain – The Adventure of Physics. Light, charges and brains

Example text

Like for all intensive quantities that evolve, the Lagrangian is proportional to the square of the intensive quantity. The minus sign in the expression is the same minus sign that appears also in c 2 t 2 −x 2 : it results from the mixing of electric and magnetic fields that is due to boosts. The Lagrangian density can be used to define the classical action of the electromagnetic field: ε 1 2 S = ???? 0 E2 − B dtdV . (19) 2 2μ0 * There is in fact a third Lorentz invariant, much less known. It is specific to the electromagnetic field and Copyright © Christoph Schiller June 1990–May 2013 As usual, the action measures the change occurring in a system; it thus defines the amount of change that occurs when field lines move.

Living in saltwater, internal voltaic cells help them to avoid death due to osmosis. ∗∗ Challenge 42 d What happened in Figure 21? Why are most of such pictures taken in good weather and with blond children? ∗∗ Challenge 43 s A PC or a telephone can communicate without wires, by using radio waves. Why are these and other electrical appliances not able to obtain their power via radio waves, thus eliminating power cables? ∗∗ ∗∗ Magnets can be used to accelerate steel balls. The most famous example is the Gauss rifle shown in Figure 22.

Why? ∗∗ Challenge 38 s How can you distinguish a magnet from an non-magnetized metal bar of the same size and material, using no external means? ∗∗ ∗∗ Challenge 40 s How do you wire up a light bulb to the mains and three switches so that the light can be switched on at any of the switches and off at any other switch? And for four switches? Nobody will take a physicist seriously who is able to write Maxwell’s equations but cannot solve this little problem. ∗∗ * A secondary cell is a rechargeable cell.

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Motion Mountain – The Adventure of Physics. Light, charges and brains by Christoph Schiller


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