Chapter 4, Problem 117P

1. the tow truck's front wheels will belifted off the ground if the moment of the load W about the rear axle exceeds the moment of 3000N weight of the truck. Determine the largest w that may be safely applied   2. the flat plate shown in the figure is acted on by the three couples. replace the three couples with two forces, one acting along the line OP

Replace the loading system by an equivlanet reusltant force and couple moment acting at point A.

Calculate the moment Mg of the 620-N force about the bolt at B. Simplify your work by first replacing the force by its equivalent force- couple system at A. The moment is positive if counterclockwise, negative if clockwise. Assume F = 620 N, r = 240 mm, h = 625 mm, 0 = 31% = 38° Answer: MB = i 0 F N.m

Replace the loading acting on the frame by an equivalent resultant force and couple moment acting at point A. 80 lb 60 lb 3 ft 3 ft- 3 ft 3 ft B A 2 ft + 4 ft 75 lb 40 lb

A twist of 4 N.m is applied to the handle of the screwdriver. Resolve this couple moment into a pair of couple forces F exerted on the handle and P

6

Replace the loading by an equivalent resultant force and couple moment at point B.

Q4-Replace the force system by a resultant force and couple moment at point O. 200N 200 N

4. Determine the resulting moment about point O from the forces shown. Assume the length of each side of the cube is 4m.