# Analytical Mechanics [closed]

I see that $W_a(1) = \dot U_a(1)=\ddot{X_a}(1) = 0.3$

Since $U_{O'}=0$ then O' is Instant centre of rotation. Then $U_b = 2U_a = 0.6$

I tried a lot, about a week, i find the speed, but there is a problem with acceleration. I know that we can find the acceleration using projections. But i don't understand what to do with $\varepsilon$. (Angular acceleration). Help me please.

I mean, that for points B, C i can find ${W_b}_n = OB*\omega_{ob}^2 , {W_c}_n = OC*\omega_{oc}^2$, because it simple to find $\omega_{ob},\omega_{ob}$ when you have $U_C, U_B,U_A$. But it hard for me to find ${W_b}_\tau = OB*\varepsilon_{ob} , {W_c}_\tau = OC*\varepsilon_{oc}$. I also don't know their directions.

I have 4 A4 papers with attempts but i very slow in LaTeX and English too.

## closed as off-topic by Bernhard, user10851, John Rennie, Danu, ACuriousMind♦Dec 7 '14 at 13:02

This question appears to be off-topic. The users who voted to close gave this specific reason:

• "Homework-like questions should ask about a specific physics concept and show some effort to work through the problem. We want our questions to be useful to the broader community, and to future users. See our meta site for more guidance on how to edit your question to make it better" – Bernhard, Community, John Rennie, Danu, ACuriousMind
If this question can be reworded to fit the rules in the help center, please edit the question.

• Full $A = Wb = \sqrt{W_{b\tau}^2+W_{bn}^2}$ – Simankov Dec 7 '14 at 11:50