HW4 - “Ulnlll PROBLEM 3.8 A sign is suspended from two...

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Unformatted text preview: “Ulnlll PROBLEM 3.8 A sign is suspended from two chains AE and BF. Knowing that the tension in BF is 45 1b, determine (a) the moment about A of the force exerted by the chain at B, (b) the magnitude and sense of the vertical force applied at C which creates the same moment about A, (c) the smallest force applied at B which creates the same moment about A. PROBLEM 3.10 The tailgate of a car is supported by the hydraulic lift BC. If the lift exerts a 125-N force directed along its Center line on the ball and socket at B, determine the moment of the force about A. PROBLEM 3.21 Before the trunk of a large tree is felled, cables AB and BC are attached as shown. Knowing that the tension in cables AB and BC are 777 N and 990 N, respectively, determine the moment about 0 of the resultant force exerted on the tree by the cables at B. PROBLEM 3.25 The ramp ABCD is supported by cables at comers C and D. The tension in each of the cables is 360 lb. Determine the moment about A of the force exerted by (a) the cable at D. (b) the cable at C. PROBLEM 3.46 The 0.732 x 12-111 -m lid ABCD ofa storage bin is hinged along side AB and is held open by looping cord DEC over a frictionless hook at E. If the tension in the cord is 54 N, determine the moment about each of the coordinate axes of the force exertedby the cord at C. ...
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