Recent content by physixer

I'm confused as to what scientists agree on, since I've read many answers. Is the total energy of the universe less than, equal to, or greater than zero? Is the universe open, flat, or closed? (I'm not sure if this is the exact same question as the previous) Is this a debate within the...

Okay, thanks!

Why are they called "differentiate" & "integrate"? I was wondering why. When we differentiate, don't we result in an equation that describes the slopes of many other equations ( + C ) ? So, we'd be "integrating" many equations, different from each other by C, into a single description...

My bad, it is indeed 20 = ... But, I tried solving for the first equation and it resulted in imaginary answers. Plugging THOSE into y=2t^3/(t+1)^2 just resulted in imaginary answers, as well. Looking at the parametric graph and the line together, though, I know there are two intersections with...

Homework Statement I'm trying to find when that parametric curve intersects with the line x=20 Homework Equations x(t)=(2t^3)/(t^2-1) ; y(t)=(2t^3)/((t^2+1)^2) The Attempt at a Solution I tried representing the line as y=t ; x=20 35=2t^3/(t^2-1) ; t=2t^3/((t^2+1)^2) I also ended up with...

Why are light waves in the form of the sine wave, instead of some other wave? Why are light waves/X-rays/gamma rays/etc. in the form of sine waves, rather than, say, a zig zag wave, or even a straight line? I recently watched this youtube video explaining how to visualize ten dimensions...

Why are light waves/X-rays/gamma rays/etc. in the form of sine waves, rather than, say, a zig zag wave, or even a straight line? I recently watched this youtube video explaining how to visualize ten dimensions: http://www.youtube.com/watch?v=JkxieS-6WuA&feature=related And wondered if photons...