Tutorial 5

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  Tutorial Sheet 5 1. (Question 2.19 from Dumir et. al.)  The members of the frame are uniform and their weights are not negligible. Draw FBDs of AB,BC,DE and part of the frame to the left of Section XX. Assume all hinge joints to be smooth and consider pin at B to be part of member AB. 2. (Question 2.20, parts d a   nd g from Dumir et. al,) Draw FBD of body 1    3. Dumir et.al (Page 130, P2.12a) A vertical column of a machine are subjected to the forces as shown in Figure. For α  = 60 0 , β  = 45 0 , γ  = 120 0 , BC=CD = 40 cm, EF= 20cm. Find the moment of each force about AB and its resultant at  point A.       4. PC Dumir et.al (Page 159, P2.27) A rigid body is in translation with acceleration a |I  and a moving point D has a D|I  =0. C is the centre of mass of the body and A,B,E,F,G are its material points. Points H,N, J are fixed in inertia frame I. at the given instant, specify for each of the points A,B,C,D,E,F,G,H,J,K,L,M, whether the moment equation takes the simple form   ̇  ̅=  ̅ . About which of these points is   ̅  = 0?
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