Given: mechanism consists of 3 members: (1) block 1 of mass m1=13kg; (2) nonhomogeneous disk 2 of mass m2=12kg, bigger radius R2=52cm, smaller radius r2=37cm, radius of inertia ρ2=37cm; (3) block 3 of mass m3=9kg.
Mechanism is moving in vertical plane from the state of rest under the action of gravity forces.
Find: algebraic value of acceleration of block 1 (in m/s2), considering it positive if directed upwards and negative if downwards. a1=?