2. The block shown in Figure 2 is acted on by its weight W= 400 lb, a horizontal force F= 600 lb, and the pressure P exerted by the inclined plane. The resultant R of these forces is parallel to the incline. Determine P and R. Does the block move up or down the incline?

Two rescue vessels are pulling a broken-down motorboat toward a boathouse with forces of 840 lbs. and 960 lbs. The angle between these two forces is 24.5°. Determine the angle between the resultant vector and the 840-lb force (x). Find the magnitude and direction ( e) of the equilibrant. r = r =₁ x=1 8=₁ -r :: cos(24.5°) (840)² + (960)² - 2(840)(960) :: 400 lbs :: 1790 lbs e :: 77 :: 169 O 840 lbs 960 lbs. :: cos(167.75°) :: 1759 lbs :: 11° :: 139 :: 103° :: 167 :: cos(155.5°) O

(8) Determine the moment of the force T = 95 N about point O. Ans: Mo=733 N·m CCW T 40° -12 m-

(7) The force F is applied on the ball of the trailer hitch as shown. Determine the moment of the force about point O. Ans: Mo 102.8 lb-ft CCW 1.25" 130° F= 120 lb 11" 1.5"