Recent content by Erfan

How can I find the F=ma tests? They might be good for practice

Thank you for your guidance! I'm downloading the problems of Canada and I should find the other two.

So the question should be solved numerically using the Lambert's W function? I mean that can't we then have a function in the form: y=f(x)? or we can no more go further than the Lambert's W function?

I had to solve a first-order nonlinear ODE which led me to a this equation.how can I find the solution for y? yey=f(x)

Hello everyone.I'm new here! and I do study for the Physics olympiad,too.I have finished all the chapters of FOP.and so I'm studying Classical Mechanic-Daniel Kleppner ,Jerry B. Marion and Electrodynamics-Grifits.But I wanted to ask where can I find national physics questions of USA and China(in...

We have no air resistance force.But it might be possible to find a solution when the air exerts linear resistance force.

Homework Statement Consider a uniforms cloud of density ρ1 which consists of many little drops that are approximately still.Consider a special rain drop that is a little more bigger than the others so that it starts to fall down.Water drops stays spherical all the way.But the radius gets...