Recent content by rieuk

That's what I thought! Cheers!

Consider a point P inside a triangle ABC. Angle PBC is 10 degrees, angle PCB is 20 degrees, and angle BAC is 100 degrees. Find angle PAC. Question is that is this problem even solvable? I found it in an Olympiad training book...

Thanks for this posting Dexter, it's helping my understanding. I'm trying to fully understand the derivation of the formulation for the vector laplacian in transformed coordinates - do you know anything on the web that also describes this (basically what you've written) but in a more explanatory...

Glad to be of assistance archeryguru2000.

Hope you got it done neji006 ;)

I would have thought that the lift could be up or down on a rotating bullet because it depends on the wind speed direction across the bullet. Anyway, here is a link that should explain most things: http://www.nennstiel-ruprecht.de/bullfly/

Integral, the sideforce by the wind is the only force on the ball. What is your point? In any case, the ball can be traveling at an infinite sped sideways, but it's speed in the original direction of motion is unchanged, and it will thus hit the wall in the same amount of time as if the wind was...

No haynewp, in case you did not notice, it is a SHADE SAIL (square shaped piece of fabric/whatever material used for sail) held up by two corners. It clearly can not be modeled as a uniform weight (it is a variable load as you go along the sail - quadratically if I remember correctly..or maybe...

To anyone who's interested, I approximated the sail to be a point mass on two strings and then calculated the tension in those strings. I asserted that this tension will be an over approximation to the actual tension because the angle of elevation of the tension force in the approximation model...

*chirp chirp* ... damn crickets.

I have to develop a mechanism with which to tension shade sails (its basically material tensioned between four posts to provide shade). I've got the mechanism going, but for the failure analysis, I need to calculate the peak tension in the shade sail. This is my information: 1. Largest shade...