Recent content by paalfis

And what should I do if that's the case?

I am in third year of University Physics, and I have been particularly interested in models of cognition for two years. I was studying and working as an assistant of an eminence in the area during the last 6 months, who, after seeing I was so interested (I was the only student interested), 'took...

Ok, talking about university physics. Usually what you can see in class of any certain topic is not everything there is to know (they are far more deep). My auto-test for knowing if I got it (after acing the exams, of course ;) ) is this: Can I rewrite the theory? When I am able to develop the...

Actually, I think that the function f (x , y) = x1/3y2/3+y1/3x2/3 works fine, am I right?

I know what this properties mean, I just can't think of a function with partial derivatives in (0,0) but not differentiable in that point.

limit as (x,y)->(0,0) of If(x,y)-f(0,0)I=0

Give an example of a function f:R2-->R , continuous in (0,0), with partial derivatives in (0,0), but not differentiable in (0,0). I was thinking in something like f(x,y)=IxyI

My academic year is over, and I got the best results of my class, my classmates where all surprised, I suppose that those loudmouths are feeling pretty stupid for their behaviour towards me during this year. After all, I can say that I really enjoy this semester after all, thank you very much...

I think that the real problem comes when you consider that the normal force in each of the bench legs is different because of the angular momentum of the bench. Then, the front leg acts like a fulcrum and the rest of the bench turns with respect to it. Sadly, I wasn't able to solve the problem...

I had the same though, anyway, the question asks for the condition necessary for the bench to TURN (hopefully meaning turning all the way down) not for the conditions necessary for the rotation to start. That would be a very complicated problem, because you would need the acceleration for the...

http://file://localhost/Users/pablotano_94/Downloads/IMG_20141205_183228102.jpg 1. Homework Statement Assume that the friction coefficient (both static and dynamic) is ¨u¨. a) What is the maximum slope yo can get in order that the bench does not slide? b) What is the maximum slope yo can get...

The question "If light speed is constant, how do you explain the Doppler Effect?" has been asked a lot in the internet. Anyway, I haven't found one concise answer. In the book Kleppner&Kolenkow Mechanics there is a brief explanation of the Relativistic Doppler Effect, but as usual in this topic...

No it doesn't. Ok, so energy is conserved. Energy won't be conserved if there is any slipping between the surfaces, correct? This is not so intuitive to me because I think static force as 'pressure' applied by each body to the other body, somehow using energy to change the molecular state of the...

Linear integral of scalar product between force and the direction of motion. But does THIS force does any work? Because after all, it is static, but its point of action is changing with time, that is my confusion.

Homework Statement [/B] A wheel rolls without slipping on a plane, what magnitudes are conserved? The Attempt at a Solution . [/B] I don't know if the static friction force does any work. Energy won't be conserved if it does.