Recent content by Tymofei

Ok i think i got it ,as i see pressure calculations based on pressure gradient which has opposite direction compared to pressure gradient-force.BUT by choosing positive pressure gradient direction toward positive s,we threat negative net force coming from it like positive,it doesn't make sense...

Yes but if we will take it negative,or replace it to other side and take it positive,after integrating(im assuming that fluid is non-compressible so all terms are exact-differantials) we will get exact solution but with negative pressure term.And it means that at constant height,result for...

Here i added a page from my fluid dynamics book where it shows particle model for deriving the equation. My question is why pressure is more at stream side aka 'positive "s" direction'.I would expected more pressure on the other side because for example when you trying to push a rigid object or...

I didn't think so,but i guess you are right. Thats the only way which explains .. thanks

I don't thinks so,because in original solution it was placed at the center of rod,and inertia was calculated as '1/12*m*l^2' which gives you inertia about center of mass.

Summary:: Just a simple 3d rigid dynamics question which I am trying to solve by placing coordinat system differently from original solution.Everything looks ok but results are different. Mod note: Post moved from technical section. Thats my question.As you see coordinate system was located...

I already solved all differantial equations also for dumped ones what I am looking for is just more intuitive understanding of mechanics behind aka 'whats really going on there" .As you pointed out,its really hard when you living and observing world where damping and friction is everywhere. By...

I have general equation for undamped forced oscillations (no friction) which is: I just wonder about,what type of motion should occur when initial conditions are both 0 (i.e v0=0 and x0=0). My intuitive expectation is that as there is no 'natural' oscillations at beginning,vibration has to be...