Answer Happy

Q3. The simplified crawler crane shown in Fig. Q3 is composed of a rode OA of constant length 0A = 5m and a hook (on C) able to translate in the vertical direction thanks to two sheaves located in A and C. The crawler crane wants to pick up a wooden box from the floor and to move it in a higher position. To do that, the rod OA rotates counterclockwise with an angular velocity, 0 = sin(t) rad/s. The hook moves vertically with a speed of r = t2 m/s. The initial conditions (i.e., at t=0) are: 0 = 0, r = 0. At = 45°, determine: a) The magnitude of the velocity of the hook. [10] b) The magnitude of the acceleration of the hook. [10] r(t)