Recent content by artworkmonkey

I rearrange the equation to be p(r)=µmHP(r)/kT(r) maybe this is not the right equation.

Homework Statement Assuming you know the core mass, and other data about the sun, such as temperatures and pressures. Find the density at the very center of a star. Homework Equations I think this may be involved. P(r) = p(r)/µmH kT(r) The Attempt at a Solution [/B] I don't know where to...

Ah, I can see now that I subtracted to wrong figure. I think I can have a good go at these questions now. Thank you, mfb, for all your help and guidance on this. It has been very much appreciated. :)

I think I understand the first part now. It uses the Doppler Effect. First I convert from nm to "meters of Å". 0.1Ån = 1nm Spectral line now has components 6668.23, 6668.30 and 6668.37 Åm, around the rest wavelength of 6668 Åm. Speed of light is 299792458 m / s Dopplar equation is: V= (c *...

Pretty much all of it. I'm out of my depth. To calculate the velocity of a wavelength, don't we need to know the frequency as well? I don't know any other way of doing it. To calculate the magnetic field strength, I think I start with Zeeman effect formula and re-arrange it so B is the subject...

I do appreciate your help, but I am still confused. Thank you for answering though.

Homework Statement From near to the center of the solar disc, Fe I line emission from point X shows a spectral line with components 666.823, 666.830 and 666.837 nm, around the rest wavelength of 666.800 nm. The central component is not as bright as those at the longer and shorter wavelengths...

That's actually helped me. I thought I knew the equation, but realized I didnt have a proper knowledge of all of the meanings. I think I can do this now. Thank you for your help :)

Homework Statement At what height above the Galactic plane are there the same amount of thin and thick disk stars. Information given: 1) Thin-to-thick disk star counts is 15-to-1 (by volume density) 2) The scale height of the thin disk is 0.3kpc 3) The scale height of the thick disk is...

Yay! Thank you for your help. I've been staring at this question since yesterday, and actually drawing it was brilliant advice. Thank you!

The area under the graph should equal the displacement, so the total area should equal 400m. I have drawn a graph (attached). When a put the acceleration and deceleration together the area is exactly one 5th of the time spent cruising: therefore, the amount of time spent accelerating and...

Homework Statement A car travels 400m in 60s. The first 10s it accelerates from stationary. The last 10 seconds it decelerates back to stationary. For the middle 40s it has a constant velocity. What is the acceleration? Homework Equations None given The Attempt at a Solution Using only time...