4.7 A hand truck is used to move a compressed-air cylinder. Knowing that the combined weight of the truck and cylinder is 180 Jb. determine (a) the vertical force P that should be applied to the handle to maintain the cylinder in the position shown, (b) the corresponding reaction at each of the two wheels. Answer Fig. P4.7 A 60% 180 lb -18 in.- B 22 in. 10 in.

Practice Problem 4.4.14: Determine the force in the hydraulic cylinder EF that would maintain the parallelogram mechanism in the position 0.6 ft shown. | 200 lb OB 3.75 ft 30 0.75 ft 0.75 ft 2 ft

(1) A 50 lb roller, with diameter 10 in, is used to level a tile floor, and is resting directly on the subflooring as shown. If the thickness of the tile is 30° 0.25 in, what is the minimum force P required to pull the roller onto the tiles when it is pulled slowly to the right? Fig. P4.75 and P4.76

The rectangular plate shown weighs 93 lb and is held in the position shown by hinges at A and B and by cable EF. Assuming that the hinge at B does not exert any axial thrust and no couples exerted on both A and B, determine (a) the tension in the cable, (b) the reactions at A and B. y Solution: 12 in. 30 in. H 4 in. E 8 in. B 4 in. 25 in. 20 in. X