Recent content by mcaay

This should do I think

Oh damn! Thanks for lettng me realize it's not the same :p

Hey, sorry for not responding immediately. Thanks for the tips, I think now I got it right, so I'll upload it for people who might lurk in this thread. Sorry for the Polish comments, I wrote that the answer can not depend on dx/dt, but it can depend on Energy which is constant and on...

Homework Statement The skier is skiing without friction down the mountain, being all the time in a specified plane. The skier's altitude y(x) is described as a certain defined function of parameter x, which stands for the horizontal distance of the skier from the initial position. The skier is...

Achh! I think I got it! I had calculus physics quite a while ago, and your clue about free-body diagram reminded me that work done is just integral of force over distance. In this situation force of gravity F = mg just changes equilibrium position, and the net force is still F = kx, where x is...

Homework Statement I thought that in the situation where mass is attached to the string and put into motion (vertically), energy goes between 1/2 kA^2 and 1/2 mV^2 like here - http://imgur.com/RU4P6UW However in student's book I saw the table, which said that potential energy of gravity is...

I found a book which suggests that the reason why plastic bags are sometimes hard to open (which feels like they were glued) is electrostatic forces, but no matter how I look at this, I can't come up with any explanation. Is the book correct? I understand insulators and conductors, how charges...