Recent content by eg2333

Ohhhhh, I see. I was treating it as a point.

Ok, so I thought about a derivation for the moment of inertia, but my answer comes out to (3/5)MR^2 Basically, what I did was I considered the sphere as a sum of infinitesimally thin spherical shells. The moment of inertia for one shell is dI=(r^2)*dm where dm=(M/V)*4*pi*r^2*dr where...

It is actually (2/5)*MR^2 for a sphere. The method I used clearly gives the incorrect answer, which is why I'm asking to see if anyone can tell me where the fault is.

Ok, so I thought about a derivation for the moment of inertia, but my answer comes out to (3/5)MR^2 Basically, what I did was I considered the sphere as a sum of infinitesimally thin spherical shells. The moment of inertia for one shell is dI=(r^2)*dm where dm=(M/V)*4*pi*r^2*dr where...

The square root of 4 can be +2 or -2, your math teacher is retarded. What you did with the imaginary number results in what I believe is called an extraneous solution (correct me if I'm wrong). If you substitute the 1 back into your original problem i^2=-1, you will find that 1=-1, which is not...

If you were to imagine a line segment of length pi, I would guess it would have to be finite. But since pi is an irrational number, it has infinitely many decimals so can't you just keep sort of zooming in on the end of the segment so that it sort of keeps on getting longer indefinitely? Pi...