# Homework Help: Damn analytical mechanics (2)

1. Apr 2, 2005

### TheDestroyer

Hi guyz, I taked the picture attached with my mobile directly from the book, please help me to find the weights of A,B (not masses), and the friction coefficient (f) for A on the Horizontel plane, and note, the rope isn't able to change lenght, System is static, A,B are equal, weight of K is Q

NOTE : I NEED TO FIND THE SOLUTION OF THIS SYSTEM USING THE ANALYTICAL MECHANICS AND LAGRANGES EQUATION (NOT THE NEWTONIAN VECTOR MECHANICS)

$$P_A = P_B = \frac{Q}{2}$$
$$f=1$$

Lagranges equation:

$$\frac{d}{dt} \frac{\partial L}{\partial \dot{q}} - \frac{\partial L}{\partial q} = 0$$

$$L = T - u$$

L is the langrangian, T is kinetic energy, u is potential energy, q is generalized coordinate,

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2. Apr 2, 2005

### robphy

First, how many degrees of freedom are there?
Second, what generalized variables would you like to define?

3. Apr 2, 2005

### TheDestroyer

Only what i have written, i don't know how many freedom degrees, the question has only the information A = B, K weight is Q, and that diagram,

I'M NERVOUS OF THAT PROFRSSOR, HE MADE THAT BOOK STUPIDLY, IF YOU SAW IT YOU WILL KILL HIM, NOTHING IS CLEAR !!!

4. Apr 2, 2005

### TheDestroyer

Well????? No one answered!!! Should we say I have fools book??????