Recent content by zimo123

I know the norm of any 4-vector is Lorentz invariant, but the only expression which comes to mind that contains the gamma factor would be the energy. E=-\vec{p}\cdot\vec{e_t}=m\gamma I guess the mass from the momentum ##\vec{p}## and from the right hand side would cancel.

Using the mass-energy equivalence principle? E^2-\vec{p}\cdot\vec{p}=m^2

Proper time of B in A's frame ? Isn't the notion of proper time tied to one reference frame ? i.e. there is just one proper time of B: that measured by B. Or do you mean "how would A compute the proper time of B?" In which case I would guess by creating two new 4 velocity vectors, one in which A...

I would think it is the ratio between the two as I previously posted. That would measure how the proper time of A ellapses relative to the proper time of B.

I already did that, see my first post in the attempt at a solution part.

The γ factor is dt/dτ, which is the time-component of the 4-velocity. I have already expressed it above in the derived equations.

Actually I am not sure what that means ... Is it just: \frac{\gamma_B}{\gamma_A}=\frac{(\mathrm{d}t/\mathrm{d}\tau)_B}{(\mathrm{d}t/\mathrm{d}\tau)_A}

Homework Statement Two rockets are orbiting a Schwarzschild black hole of mass M, in a circular path at some location R in the equatorial plane θ=π/2. The first (rocket A) is orbiting with an angular velocity Ω=dΦ/dt and the second (rocket B) with -Ω (they orbit in opposite directions). Find...

Thanks for the heads up! I'll pay attention to this next year ;) Thanks to all of you who helped me, it's really appreciated. I think I'll stay with engineering physics for a year, and then switch to mathematical physics if I really don't like it... I'll nevertheless register for the...

Try to write A in terms of B (or the other way around), and see what you get!

@elkement: Well actually, the only talk that has been given is the one I mentioned: the girl who went from ME to MP. According to what she said, physicists are needed in the industry, but less than engineers. However, she said that it compensates given that more than 200 engineers graduate every...

@ParticleGirl: I guess you're right, engineering seems the right path to follow and as you said I could always learn theory on my own! @AlephZero: I can see your point of view, but I'm not worried about my future job for one reason. Not because I won't have any ambition or motivation as you...

Well, the way I see things is that I'm really more interested in the "learning" rather than the "working". So I would just like to study physics and mathematics and have a good understanding of the universe. That's what really fascinates me. However, once I get my degree, I wouldn't mind working...

Hi and thanks again to elkement and ParticleGirl for your precious answers ! I indeed know that you don't specifically have to work in the domain you've majored in (I talked with a physics professor, and he told me that one of his students did his Ph.D in astrophysics, and is yet working in...

Hi, Thanks for you answers, and I understand I wasn't very clear. Actually, I don't think (I might be wrong though ...) I can work in insurance or finance with a degree in math-physics. There are majors in statistics, finance, actuarial, etc. specially designed for this kind of jobs. I...