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Is Time a vector quantity? 
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#19
Jun1014, 01:24 PM

P: 27




#20
Jun1014, 01:27 PM

P: 27




#21
Jun1014, 01:59 PM

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Writing about concepts such as spinors and tensors, Lorentz and Poincaré transformations, QED and general relativity, or group theory IS NOT HELPING. Yes, I broke the rules of the forum by shouting. Every once in a while that's needed. On the other hand, giving a slight inkling into the concept of vector spaces sometimes does help in straightening out beginner misunderstandings with respect to vectors (the physics 101 version of a vector, something with a magnitude and a direction). A full blown treatment? No. That doesn't help. If it's the sign that's the problem, Amio, consider temperature as an analogy. One way to express temperature is on an absolute scale, with zero meaning absolute zero. This makes all temperatures that will be encountered in an introductory physics class positive. However, telling someone that the high temperature tomorrow will be 308 K doesn't quite translate into "summer's here!". Telling them that the high will be 35 °C or 95 °F does. That Kelvin scale isn't as useful in the everyday world as are the Celsius or Fahrenheit scales. But now temperature can be negative. One can in a way do that with time (please keep relativity out of this, everyone) by setting t=0 at the big bang. Doing that is not every useful in the everyday world. 


#22
Jun1014, 03:17 PM

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For example, for a 3D vector y like velocity then there is a difference between the operations ##x\;\mathbf{y}## where x is a scalar and ##\mathbf{x}\cdot\mathbf{y}## where x is a vector. There is no such difference if y is a 1D "vector" like time. 


#23
Jun1014, 03:29 PM

P: 27

I think I got the idea. Thanks everyone.



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