# Search results

1. ### Lorentz Contraction Physical Reality

See below You spoiled the fun:cry: And I should have said equal AND constant, correct. Thanks.
2. ### Lorentz Contraction Physical Reality

Simple thought experiment I read and would like to hear what others think will the result will be: Let two spaceships A and B accelerate along a straight line. Observer C does not accelerate. The accelerations, as judged by C, are constant for both ships. Each ship is equipped with a...
3. ### Engineering About civil engineering

Many of the top students from a top CE undergrad program I attend entered the world of construction. If you want to make a lot of money, you'll go into construction, but beware as it's not for the thin skinned. I guess it's similar to phd's in math going to work on wallstreet. Job...
4. ### Can you determine absolute motion?

No. Re-read the example. Light reaches Point A and Point B on the train at different times, t1and t2. But if a third train were introduced and it was moving at some constant velocity other than the original train, then light would reach its Point A and Point B at some other times, t3 and t4...
5. ### Can you determine absolute motion?

See: http://www.bartleby.com/173/9.html Einstein's scenario decribes certain reasoning behind relativity's view of light, therefore asking 'Is Einstein wrong in his scenario or is relativity's view of light wrong', is akin to asking 'did Barry Bond's hit a home run or did Barry Bond's bat hit...
6. ### Can you determine absolute motion?

I believe you are slightly incorrect. Yes, light always travels at c and yes, you can't "add" a speed to it as you've stated. But saying 'light would hit the receptors at the same time' is misleading. Refer to 'Relativitey', Albert Einstein, Chapter 9. In Mr. Einstein's train example, imagine...
7. ### Science Writers? Are you out there?

Scientific jouranlists, sorry
8. ### Science Writers? Are you out there?

Any science writers frequent this forum? If so, I'd like your advice on a few things.

Are you trying to show that you are smart? Or maybe that you are smarter than me? What exactly is the purpose of your comment? And if you look up 'plethora' in a thesaurus you will find the synonym 'many'. Plug in many for plethora in my post. You are obviously a highly intelligent person so...

Hello, I have a BS in Engineering. I am applying to science writing graduate schools for a plethora of reasons. Are there any science writers on this forum that could offer me advice on the lifestyle they live (is it hard to find work? lots of travel involved? making a name for yourself...
11. ### Plato was right Timocracy vs. Tyranny / Democracy

Yes you have read Republic! Good to know. I do not agree with your viewpoint on 'subjectivity' and 'objectivity'. I am a scientist and engineer by profession and when you break an observation down far enough, nothing is truly 'objective'. Now there would be plenty of ways to determine whom...
12. ### Plato was right Timocracy vs. Tyranny / Democracy

And what if the heads of the governed have been brainwashed, are ignorant, or just plain unintelligent? Do you want this group making the decisions that determine the way you live your one life? I sure do not. Your Question: How do you ensure benevolence? Answer: Again, read 'Republic'...
13. ### Plato was right Timocracy vs. Tyranny / Democracy

Ok that does not help anything. 'Effectiveness in establishing'. That is what we are after. How do you effectively establish everything you mentioned? That is the reason for this thread. Let's stay on point.
14. ### Plato was right Timocracy vs. Tyranny / Democracy

Logic. Reason. Argumentation. Hypothesis. Trial and Error. All pillars of any great science or philosophical breakthrough. All parts of Plato's Republic, which started this thread.
15. ### Plato was right Timocracy vs. Tyranny / Democracy

You're idea of Timocracy is incorrect. Timocracy does not select the most capable of governing. Timocracy selects the most honorable, courageous, passionate, knowledgeable, and giving of a society and allows them to govern. This is completely different than a business corporation where yes...
16. ### Plato was right Timocracy vs. Tyranny / Democracy

And that is the million dollar question :wink: I think the argument is stronger for the tyranny of the few, as long as the few are honorable, courageous, passionate, knowledgeable, and giving. Plato's Timocracy included a method of selection that ensured only the honorable, courageous...

18. ### Plato was right Timocracy vs. Tyranny / Democracy

It light of the recent worldwide uprisings (Egypt, Iran, Bahrain, Madison - Wisconsin, to name a few), our 'democratic' world is proving it is indeed in dire need of directional change. Let us investigate 'Republic' by Plato. 'Republic' ranks four forms of government. In the ranking...
19. ### Where, in the Universe, are we?

Because I only have a background in physics and I really don't know much about cosmology. I deduced it in this way: (1) the universe is expanding aka moving with some velocity. (2) Per every physics problem i've done, if moving matter has a velocity, it may be defined in such a fasion: v = 0.4c...
20. ### Where, in the Universe, are we?

Thanks for the info marcus. Admittedly , this is all new stuff to me as I did not take astronomy or cosmology classes at my university. I took many physics and mathematics courses and am trying to use these to reason my way through this information.
21. ### Where, in the Universe, are we?

I see. Very interesting. Thanks for the explanation. I take it that means our universe has expanded at a rate less than the speed of light for this 2.7 billion years. Let's say instead our universe was expanding at the speed of light during this 2.7 billion year time period. Does this mean...
22. ### Where, in the Universe, are we?

I thought the message was sent at the speed of light (see above example)? It would then take 2.7 billion years to reach us not 3 billion, correct? I'm not sure where this fits in your original example...I think I get what you are trying to say but can't see the whole story fitting together.
23. ### Where, in the Universe, are we?

Chronos: Any input?
24. ### Where, in the Universe, are we?

Doesn't the example above assume the universe is expanding at exactly the speed of light? Doesn't it also assume the universe has expanded at exactly the speed of light for the last 3 billion years? I thought the universe expanded faster than the speed of light during the big bang? If so...
25. ### What is role of mass participating factor while doing Modal Analysis?

Number of modes depends on number of degrees of freedom.
26. ### On the interpretation of a spacetime diagram

Right. My apologies. My brain is not working this morning.
27. ### On the interpretation of a spacetime diagram

You are correct. I did miss a part to my explanation: I observed Rod A, B and C from my planet and determined their constant velocities of 0.2c, 0.6c, and 0.1c respectively. So because Rod C is moving at 0.1c and Rod A is moving at 0.2c (both in constant velocity RF), would Rod C not say 'Rod...
28. ### On the interpretation of a spacetime diagram

Maybe think of it this way: We have (1) 'stationary' rod, call it Rod A. Now let's say this 'stationary' Rod A is in a lab on earth. Obviously it is moving at some constant velocity because the earth is moving at some constant velocity, let's say equal to 0.2c. We have (1) 'moving' rod...
29. ### Magnetic or Electric Field or Electromagnetic Field?

Cool. Thanks for the follow up. It will be interesting to re-read this section in the new 3rd edition.
30. ### Magnetic or Electric Field or Electromagnetic Field?

So if this statement is false, why is it bolded? Clearly he is trying to make the point that understaing the statement as true is very important (hence the bolding of the text). Sorry just wondering why he would do this. As for my background, I took 1 1/2 years of physics at my university...