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Tensors (PDF) first chapter from Introduction to Continuum Mechanics
Zeroth-Order Tensors (Scalars): Among some of the quantities that have magnitude but not direction are e.g.: mass density, temperature, and pressure.
First-Order Tensors (Vectors): Quantities that have both magnitude and direction, e.g.:
velocity, force. The first-order tensor is symbolized with a boldface letter and by an arrow.
physics  maths 
21 minutes ago by neomanic
Quantum weirdness is everywhere in the living world | Aeon Essays
THAT'S WHY THERE DOESN'T SEEM TO BE ANYTHING VERY INDETERMINATE ABOUT A CAT.
Physicists call this property coherence: it’s rather like musical notes being in tune. If the waves don’t line up, the peaks and troughs cancel each other out, destroying coherence, and you won’t see anything odd. When you’re dealing only with a single particle’s wave, on the other hand, it’s easy to keep it ‘in tune’ – it has to line up only with itself. But lining up the waves of hundreds, millions or trillions of particles is pretty much impossible. And so the weirdness gets cancelled out inside big objects. That’s why there doesn’t seem to be anything very indeterminate about a cat.
antifragile-aviary  physics  quantum-mechanics 
7 hours ago by mozzarella
What is the relationship between quantum physics and chaos theory? - Physics Stack Exchange
Quantum mechanics is not chaotic, but probabilistic. It has strict solutions of the equations determining the behavior of particles and fields, but these solution describe and predict probabilities of observation. The wave nature of the underlying reality is a probability wave , i.e. the probability of finding a particle at (x,y,z) at time t fluctuates according to the solution of the equations.
antifragile-aviary  quantum-mechanics  physics 
7 hours ago by mozzarella
Quantum chaos - Wikipedia
led me here: editing bird photographs and being repeatedly amazed at the how tree branches work; reading Carlo Rovelli 'Reality is Not what it Seems' & 'Seven Brief Lessons on Physics
antifragile-aviary  physics  quantum-mechanics 
7 hours ago by mozzarella
Network latencies and speed of light | The ryg blog
In this short post I'm going to attempt to convince you that current network (Internet) latencies are here to stay, because they are already within a fairly small factor of what is possible under known physics, and getting much closer to that limit - say, another 2x gain - requires heroics of civil and network…
networking  physics  performance 
8 hours ago by adragomir
Pilot-Wave Theory Gains Experimental Support
QUOTE An experiment claims to have invalidated a decades-old criticism against pilot-wave theory, an alternative formulation of quantum mechanics that avoids the most baffling features of the subatomic universe.
physics 
yesterday by lafgrp
A VISUAL TOUR OF CLASSICAL ELECTROMAGNETISM
A VISUAL TOUR OF CLASSICAL ELECTROMAGNETISM

Produced by

The TEAL/Studio Physics Project

Massachusetts Institute of Technology

For The MIT Course

Physics 8.02: Electromagnetism I
physics 
3 days ago by jfmcdowell

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