Recent content by Rosengrip

Hello, I need your help or rather guidance in relation to Mason-Weaver concentration equation. I would like to learn more on that matter because I need to describe a specific problem with it (sedimentation of coffee particles in a cylindrical vessel). I can qualitatively describe how...

Maybe I've worded the question a bit wrong, PHI needs to be expressed in terms of charge and other parameters, sorry for confusion.

Hello and thanks for your reply. If I understand you correctly, the main point is substituting x with something simpler, so we lose the transcendental identity, since everything else is pretty much the same. So I went with that but unfortunately, everything I got using similar triangles and...

Homework Statement We have a charged ball with charge e and mass m hanging from the side of the charged cylinder with radius R and surface charge density of \sigma. The string to which the ball is attached is of length L Find a relation between charge e on the ball and the angle \varphi...

Hm, I don't have the right formula just yet but I somehow think that system moment of inertia in 2nd scenario would be bigger than one in 1st. Is that the correct assumption? From center of bigger disk POV, the smaller disk rotates in point 2., whereas in point 1. it stands still. The...

Homework Statement We have 3 discs, arranged as the sketch below shows. Find the moment of inertia of the whole system around the axis, passing horizontally through center of the bigger disk: 1. Two smaller disks are fixed and cannot rotate around their axes. 2. Two smaller disks can...

Homework Statement We have a round disc with radius of 10 cm and mass of 1 kg, suspended on a wire and lying on a thin (1 mm) layer of oil. We torsionally nudge it and we get some info out of it: At angular velocity of 10 s^{-1} the amplitude is maximal. At angular velocity of 12 s^{-1}...

The question is confusing in my native language too, I've sent an email to my mentor about this and I'll update it as soon as I get the answer. Thanks for the reply though.

Homework Statement Two spherical bodies with equal mass m1=m2=1000 kg are orbiting around a common barycenter in a weightless environment because of the gravitational attraction. A: Show how the frequency of orbiting is related to the distance between two bodies. B: We connect two...

Since I can't edit my first post here, I just want to correct my question: I'm looking for a speed of COM of frame after collision AND speed of ball after collision, not the speed of COM of frame and ball. I hope that's clearer:>

Thanks for the site, it's pretty interesting. I guess the most confusing thing here is that I have a solved case (ball hitting a rod) in which the COM stays the same (at the center of the rod) throughout the whole process (before and after the collision). The conservation laws still apply...

Yeah I guess that's correct. So I'm pretty much lost right now. Any tips on how to get the new COM? :)

Uh now that further complicates things doesn't it. I have a similar case with only 1 rod (COM at the center of rod) which gets hit by a ball and there ball doesn't have anything to do with COM. I can't see how ball can affect the change of COM :/. It's not connected in any way to the frame, it...

Homework Statement To rods, each with mass 0.3 kg and length 0.2 m, are welded together at one of their ends, so they form an L-shaped frame. A ball with mass 0.3 kg and with speed 5 m/s hits one of the rods at its end at an angle of 0 degrees (so ball speed vector is perpendicular to one...

Use the expression sin2x + cos2x = 1, x being either alpha or beta :) .