Recent content by toph

What makes you think that gamma ray bursts can be used as a 'yard stick' to determine which galaxies contain habitable planets? I suggest that you do some reading, you could start with http://en.wikipedia.org/wiki/Gamma_ray_burst"...

yep your right i have just spotted my error. i think i have also calculated the transformed event coordinations incorrectly as well?

Further to my last post, the reason i feel uncomfortable is that surely the x component of the coordinates should be the same for both events? I can check this via the Lorentz length contraction formula, which gives l = lo/y(V) =144?

A further Lorentz transformation problem. The question i have is. Use these Lorentz transformations ct'=5/3ct-4/3x and x'=5/3x-4/3ct. to determine the (ct', x') coordinates, in meters, that observer O' assigns to events e1 and e2. relevant equations and information. from a previous...

Ahh... the penny drops. thank you

Question Show that, with V = 4/5c, the Lorentz transformation of the equations, t^prime = y(V) (t-(v/c^2)x) and x^prime = y(V) (x-Vt). (where y(V) = the Lorentz factor). can be written as ct^prime = 5/3ct - 4/3x and x^prime = 5/3x - 4/3ct Relevant equations y(V) = 1/(sqrt1-(V/c)^2) The...

desicion made, see http://news.bbc.co.uk/1/hi/world/5282440.stm

This is the crux of what i was considering, what parameters do you think he missed out? i think he missed out a parameter for the fraction of planetary systems with a stable planetary system. i.e no planetary migration. Is this even a consideration?

Hi I am not sure if this is in the correct forum, please move if required. I know this equation is not really suited to this forum but i think a discussion about some of the Drake equations parameters are. First please see, http://en.wikipedia.org/wiki/Drake_Equation If unsure of...

Thanks for looking but i think i have solved this problem! I had spent several hours looking at this problem and then decided to ask for your advise. But as is often the case when you walk away from the problem and think of something else you often realize where you were going wrong. Thanks...

Hi I am working on a problem that requires me to calculate the brightness of a distant star. The problem i have is that the only information i have on the star is its distance and its apparent magnitude. I think that i can solve this problem with the equation for magnitude i.e m = -2.5...

Hi Bugon Thanks for your comments, i think i understand what you mean. So in brief the magnetic field of a CV (polar) causes the primary to spin-up faster than a non-magnetic CV (i.e intermediate), however because the orbital periods of polars is longer than intermediates then the final...

Hi I am have been looking into magnetic CV's and am unsure of something i hope some one can help. Considering only the specific angular momentum of accreting matter, would a polar (Magnetic CV) have a faster spin rate than a disk accreting CV? I know that in magnetic polars the accretion...

Marcus Thanks for your input, i certainly have plenty to read about now. should keep me busy for a long time! cheers.

Hello I have recently read an article about tensor vector scaler theories (Te VeS), including John Moffats STVG and Philip Mannheim's "conformal gravity", available at http://physicsweb.org/articles/world/19/6/5/1 I understand that Newtonian-Einstein gravity works very well across a...