What Units Should I Use to Calculate Planetary Orbit Time?

[lagwagon555]

Hi all, I'm working on a problem where I have to find the time it takes for a planet to form from a protoplanetary disk, using the equation:

$$t = \frac {3}{A}M^{1/3}$$

Where

$$A= ( \frac {(1+2\beta)\sigma}{P}) (\frac {3\pi^2}{4\rho_m})^{2/3}$$

However, I'm not sure which units the periods should be calculated with. Results from google seem to use both, and the units I'm given for in the question are days. However, seconds would seem the logical thing to use. Calculating using both, and choosing the best answer won't really work, since I have no idea how long a sensible answer would be. Any suggestions? Thanks.

Incidentally, does anyone know how to get large brackets around fractions, when using Latex?

 

[Philosophaie]

The protoplanetary disk when a star system is very unstable and is the building blocks of a planetary system. Here is an interesting site you may find interesting:

http://www.iop.org/EJ/article/0004-637X/581/1/681/55760.web.pdf?request-id=18af475d-f2da-407a-ba2f-0a3e870da81b

 

[tiny-tim]

LaTeX

Hi lagwagon555!

Incidentally, does anyone know how to get large brackets around fractions, when using Latex?

Type "\left(" and "\right)"

(also works with {} [] ||)