Recent content by j_namtirach

Ok, thank, I got it: for the cylinder: c = ω^2 I for the cylinder + discs: c = ω(1)^2 I + ω(1)^2 (2(mr^2)) So: ω^2 I = ω(1)^2 I + ω(1)^2 (2(mr^2)) I got to the correct answer from here. Thanks a lot for your help!

Thank you for the quick reply. I'm still a little confused here. Is the mass of the discs not significant for this problem? I don't see how I can simply use the above equation to find the moment of inertia, since I don't know either the moment of inertia or the torsion constant. Sorry, I'm...

Homework Statement A uniform cylinder 20 cm long, suspended by a steel wire attached to its mid-point so that its long axis is horizontal, is found to oscillate with a period of 2 seconds when the wire is twisted and released. When a small disc, of mass 10 g, is attached to each end the...

OK, I've got it now, thanks!

Homework Statement The atoms in the oxygen molecule [O][/2] may be considered to be point masses separated by a distance of 1.2 x 10^-10 m. The molecular speed of an oxygen molecule at s.t.p. is 460 m/s. Given that the rotational kinetic energy of the molecule is two-thirds the of its...

Thank you for the help guys. I solved the problem quite easily using the second explanation from ehild. Cepheid, your explanation seems to be a more detailed description of how the Galilean transformation can be used in these situations. I will try to work on this. I have to admit I didn't...

The question actually has a diagram which I couldn't include. On the diagram, pB has a direction towards the wall and pA has a direction away from the wall. This suggests to me that the direction is given. Am I missing something?

Hello, This is an IB question: Homework Statement A sphere of mass m strikes a vertical wall at right angles and bounces off it. The magnitude of the momentum of the sphere just before impact is pB and just after impact is pA. The sphere is in contact with the wall for time t. The...

It was less complicated than I at first thought. I've got it now! Thanks a lot for the very clear explanation.

Homework Statement A gun fires a shell with the horizontal component of its velocity equal to 200m/s. At the highest point in its flight, the shell explodes into three fragments. Two of these fragments, which have equal mass, fly off with speeds of 300m/s relative to the ground, one along the...