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# HW5 - 4-6 Determine the magnitude of the force F that...

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Unformatted text preview: 4-6. Determine the magnitude of the force F that should be applied at the end of the lever such that this force creates a clockwise moment of 15 N-m about point 0 when 0 I 30°. (11% =15N-m = Fens 3D°(0.05 + 0.35in60“) - Fsin30°(0.3c0560°) F = TLSN Ans 4-13. To correct a birth defect, the tibia of the leg is straightened using three wires that are attached through holes made in the bone and then to an external brace that is worn by the patient. Determine the moment of each wire force about joint B. (Msh = 4 cos 15° (0.8) - 48in 15° (0.02) = 3.07 N- m) Ans (Mu)2 = 3(055) = 4.40N- m) Ans (Ma )3 600530°(0.2) + 6sin30° (0.015) = Low. m ) Ans 4—18. Determine the direction 6' (00 S 0 S 1800) of the force F = 401b so that it produces (a) the maximum moment about point A and (b) the minimum moment about pointA. Compute the moment in each case. (a) 14.04”,“ = 40(J32 +25) = 330 lb . n An: «t = ran~l (g) = l4.04° 9 = 90° - [4.040 = 76.0° Ans (b) {Huron = 0 Ana ‘15 =tan" (E) =14.04" 9 = l80° — 14.04" = 166” Ans 4—31. The worker is using the bar to pull two pipes together in order to complete the connection. If he applies a horizontal force of 80 1b to the handle of the lever, determine the moment of this force about the end A. What would be the tension Tin the cable needed to cause the opposite moment about point A? t+MA = 80 (Scos40°) = 306.4178 = 306lb-ft') Ans Require 306.4178 = T sin70°(0.5) T = 652 lb Ans ...
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HW5 - 4-6 Determine the magnitude of the force F that...

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