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TIME SLOWS DOWN OR SPEEDS UP FOR THE TRAVELER?



 
 
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  #1  
Old August 27th 15, 12:50 AM posted to sci.astro
Pentcho Valev
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Default TIME SLOWS DOWN OR SPEEDS UP FOR THE TRAVELER?

http://abcnews.go.com/Entertainment/...ry?id=32191481
Neil deGrasse Tyson: "We have ways of moving into the future. That is to have time tick more slowly for you than others, who you return to later on. We've known that since 1905, Einstein's special theory of relativity, which gives the precise prescription for how TIME WOULD SLOW DOWN FOR YOU if you are set into motion."

https://www.youtube.com/watch?v=n2s1-RHuljo
Neil deGrasse Tyson: "One of the towering great achievements of the human mind in our understanding of the universe is Einstein's theories of relativity. (...) It makes only two assumptions: that the speed of light in a vacuum is constant no matter who is doing the measurement and no matter in what direction you are moving or how fast. You always get the same measurement for the speed of light. That's Assumption 1 which by the way the experiment has shown to be true. Assumption 2... (...) Given those two tenets, extraordinary spooky phenomena derive from them. For example: As you travel faster (...) time ticks MORE SLOWLY FOR YOU than it does for other people who are not."

Just the opposite conclusion derives from the two tenets (assumptions):

As you travel faster, time ticks FASTER FOR YOU than it does for stationaries (you see your clock running FASTER than stationary clocks).

Here are people who teach the correct conclusion:

http://www.people.fas.harvard.edu/~djmorin/chap11.pdf
Introduction to Classical Mechanics With Problems and Solutions, David Morin, Cambridge University Press, Chapter 11, p. 14: "Twin A stays on the earth, while twin B flies quickly to a distant star and back. (...) For the entire outward and return parts of the trip, B does observe A's clock running slow..."

http://sciliterature.50webs.com/Dialog.htm
Albert Einstein: "During the partial processes 2 and 4 [the outward and return parts of the trip] the clock U1, going at a velocity v, runs indeed at a slower pace than the resting clock U2." [Note: In Einstein's paper U2 is actually the travelling clock and U1 is the resting one, but since in the above quotation things are judged from the traveller's reference frame, U1 is said to be "going at a velocity v" while U2 is called "resting".]

Pentcho Valev
  #2  
Old August 27th 15, 04:29 PM posted to sci.astro
Pentcho Valev
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Posts: 8,078
Default TIME SLOWS DOWN OR SPEEDS UP FOR THE TRAVELER?

http://www.scientificamerican.com/ar...know-einstein/
QUIZ: How Well Do You Know Einstein?

My answer to the following question was A, but the reply was that the correct answer is B:

"3. According to Einstein's theory of special relativity, a clock moving at nearly the speed of light measures time passing:

A. Faster

B. Slower

C. In reverse

D. Unchanged from a clock at rest

Not so! The correct answer is B, slower."

The correct answer is A after all - the moving observer sees his clock running FASTER than a clock at rest:

http://www.people.fas.harvard.edu/~djmorin/chap11.pdf
Introduction to Classical Mechanics With Problems and Solutions, David Morin, Cambridge University Press, Chapter 11, p. 14: "Twin A stays on the earth, while twin B flies quickly to a distant star and back. (...) For the entire outward and return parts of the trip, B does observe A's clock running slow..." x

http://sciliterature.50webs.com/Dialog.htm
Albert Einstein: "During the partial processes 2 and 4 [the outward and return parts of the trip] the clock U1, going at a velocity v, runs indeed at a slower pace than the resting clock U2." [Note: In Einstein's paper U2 is actually the travelling clock and U1 is the resting one, but since in the above quotation things are judged from the traveller's reference frame, U1 is said to be "going at a velocity v" while U2 is called "resting".] x

Pentcho Valev
 




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