Recent content by nerak99

Yes that what I thought. When I was at school, the non-conseravtion of KE was demonstrated mathematically and I was never terribly happy with this as a "demonstration" since I figured that a maths demo merely demonstrated a limitation of the model. It occurred to me that it might be possible...

In a Physics Q, (June 2010 OCR B Q 12) we have in part a. A hammer of mass 2.0Kg is used to set (a mass on a spring) into oscillation. The following observations are made. The hammer approaches with an upward velocity of 5.0 m/s There is a sharp click as the hammer hits the mass. the hammer...

Thank you very much for your prompt answer. I might even have ended up understanding eigenvectors in this context. It was well worth ploughing through the latex to get your answer.

Normal modes of vibration, two masses, two spring, arranged vertically with m2 at the top, m1 underneath arranged (top to bottom) m2, k2, m1, k1, rigid support I have solved the first part of an undamped coupled spring problem to give m_1m_2 \omega ^ 4 + ((m_1+m_2)k_2+m_2k_1)\omega ^2...

Thanks for that. I still don't understand "why" but that is v helpfule.

In some questions I am doing, you set of a pair of simultaneous equations and in the notes we have that . For a non trivial solution of X1 and X2,the determinant of coefficients of X1 and X2 must be zero. An equation might typically look like this (m \omega^2 +k_1)x_1 +k_2 x_2=0 Why must...

Ah, Thanks, you have given me more confidenec and looking at the diagram, the middle distance can't be 3. I wonder if the question has an error, I will work it through with three and 2.3 (calculated middle brace length) and see if the results come out correctly. I will post some working.

BTW, that last post was me as I set up two accounts after Chrome related issues with registering on this site.

Here is a truss that I have sketched. The question is to resolve all forces and the reactions at the supports, one of which is pinned. I have had to export the svg as a non-vector version for this forum. The three lengths at the bottom are all 3m, i.e. 9m in all along the bottom with all...

Mmm, I thought that might be to the problem. The three equilibrium equations being sum Fx, Fy and Moments? The issue I have is that I do not know how to include the couple. Can anyone point me to an example?

I have solved a number of example questions referring to Trusses. I have one where the forces do not balance correctly when I check through. A difference with this truss is that there is a couple applied to the truss. I have been using the method of Joints to do the working out. Does the...

It is from eric idle the python member

Install idle and run in linux with python <path to idle.py> In windows you get a bat file Idle is a basic ide for python