Formulae

I made this thread for all of the mathematically impared, in hopes that people would post useful formulae *points at Mathonwy and Rydeman*. They can be about any thing, physics, optics, biology, and math anything you think is useful. Please post! You'll get to show off your knowledge as well ;] (Note: If you want I'll list all the derivitives and indefinite integrals, but I don't think you'd want them hehe)

I'll start:

Physics:
Trajectory:

x = x0 + v0*cos(@)*t;
y = y0 + v0*sin(@)*t - .5*-g*t*t

Where v0 is the initial velocity, x0 is the initial x co-ordinate, y0 is the initial y co-ordinate, g is the gravity (Earth's is 9.8), and @ is the initial angle of the projectile. You have to loop it over and over, adding to t, since t is time.

Time it takes to fall:

t = sqrt(h/(g/2))

Where t is the time it takes, h is the height in meters, and g is the gravity. I just threw this one in cause I think it's neat ^_^

Hunt the Wumpus!
Somar
[Edited by Somar on 08-16-2001 at 06:12 PM]