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Product details
File Size: 963 KB
Print Length: 265 pages
Publisher: Da Capo Press; Special edition (July 14, 2009)
Publication Date: July 14, 2009
Sold by: Hachette Book Group
Language: English
ASIN: B002TJLF7W
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Why Does E=mc²? (And Why Should We Care?)by Brian Cox is easily the best book I've ever read about special and general relativity targeted at the general reader. Cox takes the reader deeply into the theory. He painlessly introduces the reader to the basics of the mathematics needed to understand some of the more beautiful aspects of both theories and he does so more skillfully than any other writer on the subject - including Einstein himself. This is a must read for anyone who wants to be more scientifically literate.
We are in 2009, Brian is explaining why matter has so much energy, how scientists managed to figure it out and how it changed civilization. In oder words, the whole thing discuss how Einstein’s breakthrough changed physics triggering a paradigm shift in science. And you shouldn’t be intimidated by it because Brian dares to deduce Einstein's equation from a simple model. This is an empowering methodology. Here goes my favorite example. Before this book, I thought that light was setting the speed limit in the universe. But now I know that a photon is a massless particle traveling at the universe’s speed limit.
Interestingly written book by knowledgeable scientist who have figured out how to explain very complicated things in an easily-comprehended way. Without a strong background in physics or math, with a little application, I have been able to get glimpses of what Einstein's formula means. It was an exciting process to sit with this book and savor the subject presented.
This book is wonderful because by way of working through the famous mass/energy equivalence it explains the profound wonder of Einstein's "spacetime" universe in layperson's terms. I have been casually acquainted with the theories of relativity for decades, having read books on general and special relativity (and being a bit of a scifi buff), and knew the basics such that mass and energy are interchangeable and that time slows down for objects approaching light speed. But here are some things no one had ever explained before:1. Einstein and his colleagues deduced the nature of the universe by using simple mathematic formulas. For example, the elemental Pythagorean Theorem of geometry is used to calculate the slowing down of time as objects approach light speed. The authors point out that the most complex phenomena in the universe, from subatomic particle interactions to cosmic forces of time and space, follow the elegant rules of mathematics. Nobody knows why the seemingly infinite universe should follow these wonderfully simply rules, but it does!2. That space and time are components of an integrated whole called spacetime. I had heard the cliché that "time is the fourth dimension" but did not understand it intellectually. This book explains how space and time are integral parts of each other. All matter moves at exactly the same speed through spacetime. If the velocity of an object through space increases, its velocity through time decreases such that the combined movement through space and time is always constant.3. The nature of "C" has been somewhat obscured by calling it the "speed of light." "C" is the maximum attainable speed of EVERYTHING through the SPATIAL DIMENSION OF SPACETIME. A photon travelling at "C" is going at maximum velocity through space and at zero velocity through time. An object at rest travels at zero velocity through space and maximum velocity through TIME. That is why times passes fastest for objects at rest and slowest for those at light speed.4. "C" is THE constant of the universe. Everything else is malleable. Time and space and matter and energy must shrink or expand in changing circumstances, but "C" never does. If one were to approach the speed of light the distance between the stars would shrink such that one could travel to the end of the universe in one lifetime. Fifteen billion years would have passed to people standing relatively still on earth, but for the astronaut travelling near light-speed perhaps only 20 years have passed (the 20 years is allowing time to accelerate and decelerate from rest to lightspeed and back). In a relativistic universe space shrinks into nothingness when "C" is reached. This explains why nothing can exceed the speed the light. A photon travels a dimensionless universe in a timeless instant. This also explains why travel BACKWARD through time is not possible.5. Toward the end of the book the authors give the equation that explains every subatomic particle and every force in the known universe. It's a difficult equation comprehensible only to physicists, but still, knowing that you can express the entire nature of the universe in a few lines of mathematics is mind-bending!If a layperson wants to comprehend the nature of the universe by reading one book, this is it!
Pretty good book for those interested in relativity.I think on the whole the attempted simplifications work well and I was a great way to approach the subjects from a more personable point of view. It does jump a little and feels like it ties itself in knots at times... but welcome to the world of physics where even concepts of simplicity can be complex to understand. It's purely a field of interest for me, and just one facet of understanding the world around us. The math is minimal, so don't panic.It can't explain how Nicholas Cage actually made a Ghost Rider sequel - some things in the universe are even beyond the greatest minds understanding.
I have read this book several times now and I am able to learn more each time. This book is not too advanced to overwhelm you with concepts that challenge common beliefs. You have to digest physical realities that seem impossible. Gradually you expand your understanding as the subject is spoon fed without too much math. There is a physicists sense of humor throughout the book. If you watch the Big Bang series you will get more of the jokes after reading this book. Enjoy
I feel this book has given me the best understanding of Einstein's theory I have managed to assimilate to date. This is a difficult topic but the book does reveal that at least some of it is no different than understanding the ratios in everyday math associations. The genius of the equation is that Einstein found ratios in elements of the universe that, until he came up with the equation, no one else had considered to be related. But, since time, mass and energy do appear to be connected by an ever mounting body of experimental evidence that supports the equation, it also means that the ratios captured in the equation indicate how the amounts of the constituents of the equation flow into balance as the different elements change in relationship to each other. The book still remains top heavy on the math part for me but it did give me enough clarity to be able to get it into a prose format for myself that did seriously improve my sense of understanding of this amazing formula.
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