That would imply that the redshift is either due to gravitational or velocity redshift, which leads to a big problem for large distances.
If you interpret the redshift as the "common" Doppler-Shift, you would get velocities v>c for objects at large distances (plus, you would need to explain...
GeorgeSol is right, the main factor for the redshift varies with distance:
1. For small distances the photon only travels a relatively short time and therefore the redshift due to the expansion of space is small as well. The main factor in this case is the velocity of the object.
2. For...
Hey Hasman, you don´t necessarily need the density. Just insert the radius of the sun for the radius of the black hole in the above calculation and you are there!
And I believe the calculation for the density is correct.
Sorry for my english...
I think you have to insert the Radius of the sun for r (look at the link). Thats why the formula is often given in the form d=R*(2D´/D)^1/3 so that you don´t need to know the radius of the satellite. Other than that it should be correct.
Well, I have a problem which currently bugs me (although I think I already solved it). Find the solution to the differential equation:
dv/dt = a*v+b*v^2.
It represents the movement of a particle with a velocity dependent friction force (which is proportional to v for small v and...
Hello Hexa,
in the case of h=h(x,y) you get for each set of values x and y a corresponding height h, which is a scalar. Or to put it another way: For every point on the x-y-surface you get a certain height h. So altogether the function describes a 2-Dimensional surface in a 3-Dimensional...
Franznietsche is right. From Wikipedia:
http://en.wikipedia.org/wiki/Redshift
... v > c is possible for objects dominated by cosmological redshift because the spacetime which separates the objects (eg a quasar from the Earth) is expanding and spacetime is described by general relativity...
In the case of rapid expansion/compression you could use the adiabatic laws to calculate how the Temperature changes with Volume (without considering the pressure; all you need is the initial Temperature and the Volume before and after).
Here´s a link...
I´m pretty sure that the potential is always a scalar. By definition, the Force resulting from a potential U is F = grad U, which would make no sense if U was a vector field.