Perhapse I should start with an easier question and then I can try to build from there. What equation would you use (or how would I find) the velocity (or CFM) that would happen if there are 2 areas of differing pressure Delta P with an area connecting them A?
I would think this might be some...
Hey its been a while since I took thermo and I am pretty rusty. I am trying to figure out a system with differential pressures. I can find the temperature difference pretty easy but finding the exact pressure difference is a bit more complicated then I remember.
Situation:
I have a small...
I was reading wiki's blckhole page and its diseription of what happens as you approach/enter the event horizone does not seem to make since to me. Spocificaly things like
"An infalling object takes a finite proper time (i.e. measured by its own clock) to fall past the event horizon. This in...
When a star or galaxy etc is said to be 10 light years away is that from a standard Earth's velocity distance (ie without length contraction) or do we take into account Earth's velocity and gravitation and have a standard length (maybe accordance with the milkyway being stationary or if we...
Although information can not be trasmitted faster then the speed of light I believe it can be recived from distances further then 300,000,000 m in less then 1 second. (You can not break the laws of physics, but you can work around them.)
Hey I am trying to make sure I understand these diagrams. I added a brown signal. Will this signal ever reach the rocket? I assume that the signal is received when the rocket line and The ship line cross.
Please correct me if I am wrong, but I believe neh4pres is referring to a stationary frame (ie the frame that sent the signal.) It does seem very odd that in this frame the rocket never reaches the speed C but the signal is traveling at C so it seems that from this frame it would eventually...
Because the speed of light is constant in all frames I do not think it matters what direction you are moving in. Once you have accelerated there is no difference between you moving toward/away from the clock or the clock moving toward/away from you (besides doppler effect but that is not what...
Are there any experiments that show how light is treated as a frames velocity is changed (not the light source, rather the "eye".) For example if a huge clock that is counting down from 10 is 10 light seconds away before I accelerate (at t=0) to a velocity where my length contraction is *.5 (I...
This is off topic, but our eyes (plural) can distinguish distance by triangulation. Of course we only see what is currently hitting our eyes, hence the definition of simultaneity is not what we see but rather what has already been stated above.
Do you guys not see that what I said is equivalent to what Fredrik said? Make T=1 second so that -T = -1 second then it is clear that at x = 1 light second t=0 simultaneously with x=0, t=0. Ergo what I am currently seeing with my eyes at a distance x=1 light second is what happened when my T=-1...
Can't we test this? Isn't this equivalent to a charged particle (the space station) and a wire without current (the electrons are the rockets and at rest). When we apply current we give the “rockets” velocity and we can do the math to see if they contract or stay the same distance apart in the...