Chapter 4, Problem 85P

Q1: The cable AB prevents bar OA from rotating clockwise about the pivot O. if the cable tension is 750 N, determine the n- and t- components of this force acting on point A of the bar:

5 The compound bar is supported by a thrust bearing at A, a slider bearing at B, and the cable CD. Determine the tension in the cable and the magnitude of its moment about the x axis. D 2.8 ft ! 3.5 ft 3.5 ft 270 lb

Q6/ The motor mounted on the bracket is acted on by its 160-N weight, and its shaft resists the 120-N thrust and 25- N.m couple applied to it. Determine the resultant of the force system shown in terms of a force R at A and a couple M. Ans. M= -7 +9; + 245 N•m 200 mm 75 mm 160 N 25 N-m 75 mm 120 N 100 mm

Given a system made of the force F, couple M and distributed loads defined by w1 and w2, find the equivalent system at B.Take F = 8 kN, M = 5 kN.m, w1 = 8 kN/m, and w2 = 4 kN/m.Also, d = 1 m.

The combined action of the three forces on the base at O may be obtained by establishing their resultant through O. Determine the magnitudes of R and the accompanying couple M. Assume F₁ = 350 lb, F₂ = 620 lb, F3 = 520 lb, a = 5.4 ft, b = 2.9 ft, c = 4.0 ft, and 0 = 50°. b Answers: R= i lb M = i lb-ft F₁

the three forces, each of magnitude F, are applied to the crate. Determine F so that the three forces are equivalent to a single 3000-N force.

The mass of the luggage carrier and the suitcase combined is 12 kg. Their weight acts at A. The sum of the moments about the origin of the coordinate system due to the weight acting at A and the vertical force F applied to the handle of the luggage carrier is zero. Determine the force F (a) if α = 30; (b) if α = 50

The combined action of the three forces on the base at O may be obtained by establishing their resultant through O. Determine the magnitudes of R and the accompanying couple M. Assume F₁ = 410 lb, F₂ = 660 lb, F3 = 700 lb, a = 5.8 ft, b = 2.0 ft, c = 3.9 ft, and 0 = 53° a Answers: R = i lb M = i lb-ft

The top viewv of a revolving entrance door is shown. 0.8 m Two persons simultancously approach the door and exert forces of equal magnitudes as shown. If the resulting moment about the door pivot axis at a is 25 N .m, determine the force magnitude F from the following answers which of them is correct: 0.8 m 15° O M= 16.18 N.m O M= 0 N.m O M= 18.16 N.m M = 181.16 N.m O M= 161.8 N.m