In the system in the figure, the total mass of two plates of the same thickness, made of the same material and connected to each other is 70 kg. What is the angular acceleration of the system? (A1=1...

In the system in the figure, the total mass of two plates of the same thickness, made of the same material and connected to each other is 70 kg. What is the angular acceleration of the system?

(A1=1 m, B1=0.6 m. A2=1.2 m, B2=0.4 m, M=50 Nm)