# Solution of the D3 D20 (Fig. 2 cond. 0) termehu Targ 1988

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Solution of the D3 Option 20 on the theoretical mechanics of the problem book Targ SM 1988. Conditions problem D3 (p. 44 in the training manual Targ SM): The mechanical system consists of the weights 1 u2 (coefficient of friction of the cargo plane F = 0,1), a uniform continuous cylindrical roller 3 and the stepped pulleys 4 and 5 with radii steps R4 = 0,3 m, r4 = 0,1 m, R5 = 0,2 m, r5 = 0,1 m (the mass of each pulley assumed uniformly distributed over its outer rim) (Fig. D3.0, D3.9, Table. D3). Body of interconnected yarns wound on the pulleys; Lots of threads are parallel to the planes. Under the force of F = f (x), which depends on the displacement of the point of force application, the system is set in motion from rest. When the system moves on pulleys 4 and 5, a constant torque resistance equal respectively M4 and M5. Determine the value of the required quantity at the time when the displacement of the point of application of force F is equal to s1.