Recent content by kennethgilpin

Ahh, I remember this from school. Presumably it only works if you can find a derivative of the original function.

Thank you for your detailed replies. although I was pretty handy at maths, that was 'A' level which was almost 20 years ago, so I don't understand the notation in micromasses answer. I'm a physiological modeller, and solved the equation by induction, i.e. by knowing my upper and lower...

hi, quick question, is it possible to solve an equation of the type: cos(a + 90 - b) = k.a to find a where b and k are known? Do you have to solve this by iteration? kenneth

thank you for your replies. @likeSerena - i got similar equations to you which I could not solve. This is for use within an iterative model so I will try to solve it iteratively. kenneth

Dear all, I feel this should be a simple problem but I can't solve it. Could you give me a hand? Imagine if an arc is bounded by a rectangle of dimensions width and height. The arc starts in the bottom left corner of the rectangle, and ends in the bottom right corner. The apex of the...

thank you for your reply. I've been using a mixture of your code and mine and it's been working well. I think that there is another regime and i wanted your opinion/help for it: where, speed is above vt _and_ speed opposes the force. once again you would still need a 'tz' time parameter...

Filip thank you a thousand times for your help with this problem. I just wanted to tie this thread off in case someone else comes here looking for a solution. You can see that I've used some of the formula above but haven't written in the need to decelerate (or accelerate) the particle to...

thank you all of the formula work wonderfully. You haven't defined v in the case of f being negative, and also v0 > vt. I assumed it might be: v = v_t \cot(\cot^{-1}(v_0/v_t)-\lambda t) (can't find the Latex for arccot!) but this doesn't work out, and when I...

thank you for your quick reply. The function seems to work well in with a few test examples I've just put in. the problem is for my use is with deceleration due to a change in direction of the force, f. if I have a positive velocity, v0, but a negative force, f, then function (2) does not...

Hi everyone, I'm a doctor who is fair at maths - haven't done physics for a while. I'm trying to model some heart physiology which I can describe as a mechanics problem: I have a particle, mass m, with a constant force acting on it, f. It also has resistance R, where the resistance is...