Recent content by Tuugii

wow that picture looks awesome! I'll visit your place at some point of this 4 years! :) Tuugii

hey Skip! :) I am a newbie here. Looking for some discussions on some problems related to my astro class.

Suppose a spherical shell identified as a supernova remnant is observed with radius r and with outward expansion speed v. Assume the mass density of the ambient medium to have the uniform value "ro_0". then the supernova remnant must have swept up mass M = ((ro_0)*4pi*r^3)/3. Let the original...

thanks a lot. But what is the equation of evolution? if you can provide me a little more info on that, I think I can make it further. Tuugii

how to solve it? thanks, Tuugii

I have one more questions, I really don't get the concept: Show that a local observer far from the black hole ages at the same rate as the observer at infinity and that the former’s aging rate stops in comparison with the latter’s when the event horizon is approached. can someone please...

Hey all, I need a help to determine the Mass-Radius relationship for a neutron star. I've done it for a white dwarf, but for a neutron star I need to know the Neutron degeneracy pressure expression, can anyone please help me to solve it? I am thinking that if I have the n.deg.pressure...

thanks for the reply. But I didn't understand what was your hint... :)

Homework Statement The gravitational potential energy W of a self-gravitating sphere of mass M and radius R depends on the detailed distribution of mass within the sphere, but it is generally of order of magnitude -GM^2/R. For the Sun, W_sun = -2G(M_sun)^2/R. What is the timescale t =...

The gravitational potential energy W of a self-gravitating sphere of mass M and radius R depends on the detailed distribution of mass within the sphere, but it is generally of order of magnitude -GM^2/R. For the Sun, W_sun = -2G(M_sun)^2/R. What is the timescale t = -(1/2)(W_sun)/(L_sun) over...

3rd law, and the sum is 0

thanks forces? it says the only force is Lorentz one... hey I am totally newbie to EM. :P

Homework Statement There is a uniform electric field E, and a uniform magnetic field B in space. A particle of mass m, and charge q, at the origin is released from rest at t=0. The only acting force on the body is the Lorentz force. Derive the trajectory of the particle for t>=0. Homework...