Recent content by portuguese

Homework Statement I'm studying for a Mechanics exam and I have a doubt on a 'Kinematics - Vector Derivative' exercise. I don't know how to begin and that's my main problem. Well, this is the exercise: Some data: This mechanical system comprises: - Body 1: A T-shaped arm, with...

I found my mistake. I wrote: It's not 0, you're right. Thanks a lot! ;)

Yeah, my answer is 0

Thanks! Btw, I understand your simplifications, but I have to do this way... ;)

But it is still correct?

Consider that the curve C (IR3) is the intersection between x2+2z2=2 and y=1. Calculate the line integral: Note: The curve C is traversed one time in the counter-clockwise direction (seen from the origin of IR3). My attempt: http://i.imgur.com/5EsJO.png Can someone check? Thanks! :)

Homework Statement Consider this circuit. Calculate the complex power for the circuit, and correct the power factor to unity by connecting a parallel reactance to the load. Homework Equations The Attempt at a Solution My attempt: Can someone check? Thanks a lot!

Thanks a lot!

Is it just (VB-VA)/200=2?

So, there's an incorrect equation, right?

Homework Statement Consider this circuit. Find the Thévenin and Norton Equivalent Circuits (just need the 1st one). Homework Equations The Attempt at a Solution My attempt: Can someone check? Thanks a lot!

How do I do it for C2? I think this is the biggest problem for me.

Homework Statement I have exam tomorrow and there's a problem I don't know how to do. Consider the curve C1 (x=-y^2+3y) and C2 (x=0), both defined for y\in[0,3]. Calculate the work done by F(x,y)=(x,y^2) along the curve C=C1UC2 (retrograde direction). Homework Equations The...