Hi there people, I have been in the physic course of my school, tought I not aprovate it. Then I need present a exam of "recuperation", I will like to know if you have a book/resource (online) because I can't buy for the moment and the exam is soon, then I need to see examples :), I think now that I have studied I understand somewhat good some concepts then I guess I not need more "theory" but get hands on examples and exercises, that also mean that a large text will not help much because no time for read it. I'm litle rusty at calculus and vectors, but I think I can pass over... the not much problem about that. With me specially what fail is how to solve the problem, that is something like "I understand what you whant, I understand the 'factors(concepts in theory)' in the problem, but dont know how exactly plug them on"... for example, now I'm trying to solve a problem in electric field, is the one that is a semicircle with a +Q in the midle and -Q in the other midle... I know that I have a [tex]d\theta[/tex] and a diferential of the circle is [tex]dl[/tex] and when come to the part of get the relation of [tex]dl = \lambda dQ =[/tex] then I get stuck, I can't "see" the correct relation :), I guess is some like [tex]dl = \lambda rd\theta[/tex] now I must obtain what is [tex]d\theta[/tex]... Anyway, I guess you see th point, I understand at rudimentary the concepts (I know what you are asking and what I will answer), but the part of solve the problem isn't right. I think what I will like to see examples and problems are about: 1) Newton's Laws. (tensors, friction, 2) Work and energy. 3) A little of circular motion and kinetic. 4) Electric interactions: coulomb's law electric flow gauss's law and electric potential) 5) magnetic interactions: Lorentz Force Biot-Savat's Law Ampere's Law I hope if you have any feed-back on such a reference, I not need the theory I guess, I need focus more in the problem solving. Thanks for your attention.