FD 3 2 m 1990 CM 10m 10m X 40m Mg B Problem 3 The forces acting on a 67000 kg aircraft flying at constant speed are shown in the

Question

FD 3 2 m 1990 CM 10m 10m X 40m Mg B Problem 3 The forces acting on a 67000 kg aircraft flying at constant speed are shown in the figure above on the left The engine thrust F 500 000 N acts on a line 1 6 m below the center of mass CM The lift force Fr acts at a distance of 3 2 m to the right of the center of mass CM a Determine the lift force F Answer F 656 600 N b Determine the drag force Fp and the distance y above the CM that the drag force FD acts on the plane Answer FD 500 000 N and y 2 6 m Problem 4 A 60 kg painter is on a uniform 25 kg scaffold that is supported above by two ropes see the figure above on the right There is a 4 9 kg pail of paint to one side How close to the left end of the scaffold can the painter get before the scaffold tips over In other words what is z as shown in the figure above on the right Hint The value of a must be less than 1 0 m Thus the painter will be to the left of the rope on the left Also the scaffold will tip over when the tension from the rope on the right is 0 Answer 0 085 m

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