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# HW9 - 4-17 The ends of the triangular plate are subjected...

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Unformatted text preview: 4-17. The ends of the triangular plate are subjected to three couples. Determine the magnitude of the force F so that the resultant couple moment is 400 N -m clockwise. 045 0.5 = EM; — .2 — .. (+51; 400 600(cos 40°) F(cos 40") 250(1) F=830N Ans 4-89. If the resultant couple of the three couples acting on the triangular block is to be zero, determine the magnitude of forces F and 1’. BA = 0.5 m Theoouplccreatcd by the 150 — N forces is MCI = 150 (0.5) = 7SN-m "then 3 4 MC, = 75 (3)) + 75 (-5—) k = 45j + 60k Me; = — P(0.6)k Me: = - F (0-6)J' Require MC. +qu +M.:3 =0 45] + 60k — P(0.6)k — F(0.6)j = 0 Equals the] andlrcomponents 45—F(0.6)=0 F = 75N Ans 60—P(0.6)=0 P =1(X)N Ans ...
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