# Online book with examples and exersices?

1. Feb 7, 2006

### rea

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 $$d\theta$$ and a diferential of the circle is $$dl$$ and when come to the part of get the relation of $$dl = \lambda dQ =$$ then I get stuck, I can't "see" the correct relation :), I guess is some like $$dl = \lambda rd\theta$$ now I must obtain what is $$d\theta$$...

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.