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

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