Recent content by Gloyn

Yes, of course, sorry for not being specific. I meant the total count of collisions. All are elastic, no friction between any objects whatsoever. And by alpha I denoted that outer mass is alpha times bigger than inner mass.

We push the outer mass towards the inner, but velocity is not given, I just assumed it to be v. The inner mass is at rest before the first collision occurs.

Homework Statement Hi! I have found an interesting statement. It says, that if we have a system of two masses and a wall (all collisions will be elastic ones) with one mass (lets label it as 1) trapped between the other mass (2) and the wall and if there is no friction, then if ratio of...

You're right of course :) Thanks for help!

Homework Statement We have a body of mass M placed in a kind of sledge like on the picture: Coefficient of fristion between the mass and the sledge is zero, but the coefficient of friction between the wedge and the sledge is μ. Angle of the wedge is α. The sledge is massles. The slegde is...

Oh, I'm dumb. Thank you guys.

Oh, yeah, it should be 30 degrees, so half betha. But I only have 3 equations and 4 variables (ratio and 3 different velocities). How do I overcome this?

Oh, betha is 60 degrees. Can I see how did you work out the formula for the ratio?

Yes, they did. So they're not in symmetricall positions in every moment, but paths are symmetrical, right? What can we do about it then? Those three equations i mentioned are not enough, i guess?

Homework Statement Mass A is moving towards mass B, which is stationary. Collision is elastic. After the collision both masses are mobing symmetrically to the initial direction of motion of mass A. What is the ratio of masses A and B if the angle between directions of motion of the masses is...

I mentioned the infinity, but in fact if there is an overall expansion and in general things are getting further and further from each other then energy of gravitational interaction is decreasing even in finite distances. If Univerese was made of three big lumps and the distance between them was...

Thanks for answering my question! Ok, I get this one now, even though I think that he should do some clear remark on that. Now i come up with another question. Maybe it's lame, but it's bothering me a bit. There is a 'deal' between physicists, that graviataional potential at infinite distance...

Hi! I just found that vide on Youtube: http://www.youtube.com/watch?v=veU6hK3jMH4&feature=watch-vrec And something is not quite ok for me. In ~1:00 Krauss says, that in flat universe model universe would expand slower and slower but would never quite stop expanding. On the other hand, in last...

I would use the Gauss Law. Let's consider a cylindrical surface with it's axis perpendicular to the sheet that "sticks out" of the sheet equally. Gauss Law states, that: \epsilon _0 E \int ds = Q And Q=density of charge x volume. From symmetry we know that there's no flux through the...

Damn, it works :). Thank you very much, I didn't think of doing that trick.