Recent content by redivider

wow I was doing the same problem, check my thread maybe it helps. Also this isn't a torus. That would be way more fun though.

Homework Statement You have a space station in space far from any planets or stars in form of a hollow cylinder with inner radius R1 outer R2 length L and density Rho. On a symetric axis z are 2 astronauts, 1 at the middle and the second at distance H=2L from the center of the bottom of the...

Imagine a pool ball getting hit, that's what I think this problem is similar to. The collision happens like so: http://i.imgur.com/htf6M8X.png EDIT: I don't know how to explain it in english I guess, this is what I meant: https://vid.me/DVHd

Well the collision happens at an angle not head-on so I believe it is the 2. one, and the angle under which the first one hits the second one is, I believe (45+30)/2 and then I pretty much have the solution, just the "muscle exercise" remains.

Homework Statement [/B] A cylinder with mass 3kg slides on ice with its base surface at 5m/s and collides with an identical but stationary cylinder. The collision is elastic. After the collision, the center-masses of the cylinders move at angles 45 and 30 degrees from the starting direction...

It is not the same question but it is related to the first one (just with x going to infinity, not to R). Anyways, I have managed to use my google-fo and found a newer edition (1996); the one I have is 1988. This part is wrong. It states that F=8πGm (force between the particle and an infinite...

Yes, my mistake, thanks! What happens if the radius of the disc is infinite? The part I don't understand: σ(area density)=M/4πR^2, but isn't it just M/πR^2 (without "4" at the bottom)? I mean the whole mass of the disc would be M=πR^2σ, since πR^2 is the area of a cricle, with the 4 added its a...

Homework Statement Calculate the gravitational force between a point mass and a circular platform. Homework Equations G=m1*m2/r^2 The Attempt at a Solution http://i.imgur.com/dfZf9GK.jpg The actual solution is different. They integrated by the angle between a/r (alpha) but i do not...

1. https://gyazo.com/a298396e34c32669755a5caffe82290e https://gyazo.com/a298396e34c32669755a5caffe82290e A small ball of mass m = 30 g hangs from the ceiling on a l = 50 cm long light rope. From the side a chain is attached, as seen on the picture. Whats the mass of the chain? Heres the part I...