Question

Please solve all the questions.

120 N Question No. 1: A 120-N force is applied to the control rod AB as shown. Knowing that the length of the rod is 0.6 m: 1. Determine the moment of the force about point B by resolving the force into: a. components along AB and in a direction perpendicular to AB. b. horizontal and vertical components. 2. Determine the horizontal force at A which creates the same moment. Question No. 2: Knowing that the tension in cable AB is 450 N, determine the moment about O due to the exerted force by the cable at: a) Point A b) Point B Question No. 3: A transmission tower is held by three guy wires attached to a pin at A and anchored by bolts at B, C and D. Determine the angle formed by wires AC and AD 20 ft 27 45 ft soft S 65

Answer 1

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- @ Component along AB ft to AB 120 Sinto DOA MB = (180 Sinto) x 0.6 + (Roconto) xo My = 67.66 Nm Rocas 7o) xo Rocas 7o 6 Horizontal & vertical components Ro Ro Sinuo UDA Rocasual MB = (120 carro)0 6 Sinza 0.6 Sin30 +(120 sin 40 ) 06 (as 30 o 6 cas 30 MB = 27.58 + 40.08 MB = 67.66 N-m 1 & Horlzontal force at A to create some moment Let the force to F FE FX o 6 sino = 67.66 06 Sino F = 825.53 N This will be the Horizontal force at A to create same moment.