Chapter 4, Problem 123P

Replace the force system acting on the post by a resultant force and couple moment at point O. 150 lb 3 5 O 300 lb 30° 2 ft 2 ft 2 ft 200 lb

The couple acts on the handles of a steering mechanism. In the position shown, the moment applied by the couple about the z-axis is zero. Determine the distance b. Use F=150i90j+60kkN.

The top view of the revolving entrance door. Two persons simultaneously approach the door and exert forces of equal magnitudes as show. If the resulting moment about point (o) is 25 N.m. Determine the force * .magnitude 20° 0.8 m 08 m 200 F=16.63 N F=14.63 N F=12.63 N O B

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

Replace the force system acting on the post by a resultant force and couple moment at point O. 300 lb 30° 150 lb 2 ft Question 5 2 ft 200 lb 2 ft

Replace the three horizontal forces and applied couple with an equivalent force-couple system at O by specifying the resultant R and couple Mo. Next, determine the equation for the line of action of the stand-alone resultant force R. ^1.2 m 1.2 m /0.6 0.4 m 5 kN m 0.9 m 62° 10 kN-m 11 kN 9 kN 0.4 m

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

Solve correctly

Replace the two forces acting on the rectangular solid by a wrench. Write the force R and moment Mas vectors and specify the coordinates of the point Pin the x-y plane through which the line of action of the wrench passes. 240 mm 450 mm 160 N 160 N 360 mm Answers: R= (i it j+ i k) N M-( it j+ i k) N-m Coordinates of point P. (ху) - ( )mm