(a) The crankshatt AB shown in Figure 1.1 is rotating clockwise with an angular velocity of...

  

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(a) The crankshatt AB shown in Figure 1.1 is rotating clockwise with an angular velocity of mas 5 rad/s. The crankshaft is connected with rod BC and at the end of rod BC is attached the disk at point C which rolls without slipping on the flat surface D. The disk has a radius of r 0.1 m. At the instant shown, determine the velocity of the centre O of the disk. 0.5 m 0.3 m W=5 rad/s O6.1 m A 60 D Figure 1.1 The crankshaft mechanism (b) i. Figure 1.2 shows a 25 kg diving board and it is initially supported horizontally at rest by pin at A and spring at B in which compressed at 100 mm. If 80 kg an amateur diver is standing statically on the center of the diving board at point B, detemine the angular acceleration of the diving board and the acceleration of the diving board's mass center at the instant the 80 kg mass from amateur diver is applied. Assume that the board is uniform and rigid. (#Hint: Apply force and acceleration method for kinematics of rigid body) 1.5 m B 1.5 m C k = 8 kN/m Figure 1.2: The amateur diver standing statically on the diving board (a) The crankshatt AB shown in Figure 1.1 is rotating clockwise with an angular velocity of mas 5 rad/s. The crankshaft is connected with rod BC and at the end of rod BC is attached the disk at point C which rolls without slipping on the flat surface D. The disk has a radius of r 0.1 m. At the instant shown, determine the velocity of the centre O of the disk. 0.5 m 0.3 m W=5 rad/s O6.1 m A 60 D Figure 1.1 The crankshaft mechanism (b) i. Figure 1.2 shows a 25 kg diving board and it is initially supported horizontally at rest by pin at A and spring at B in which compressed at 100 mm. If 80 kg an amateur diver is standing statically on the center of the diving board at point B, detemine the angular acceleration of the diving board and the acceleration of the diving board's mass center at the instant the 80 kg mass from amateur diver is applied. Assume that the board is uniform and rigid. (#Hint: Apply force and acceleration method for kinematics of rigid body) 1.5 m B 1.5 m C k = 8 kN/m Figure 1.2: The amateur diver standing statically on the diving board