Chapter 8, Problem 28P

The two uniform sheets of plywood, each of length L and weight W, are propped as shown. If the coefficient of static friction is 0.5 at all three contact surfaces, determine whether the sheets will remain at rest.

The single-threaded screw of the floor jack has a pitch of 0.5 in. and a mean radius of 1.75 in. The angle of static friction is 8.5. (a) Determine the couple C that must be applied to the screw to start lifting a weight of 4000 lb. (b) What is the couple required to start lowering the weight?

The panel of weight W with its center of gravity at G is placed between vertical guides and released. Determine the largest height h for which the panel will not slide down due to binding at corners A and B. The coefficient of static friction between the panel and the guides is 0.5.

The leather rein used to fasten the horse to the hitching rail weighs 3.5 oz per foot. The coefficient of static friction between the rail and the rein is 0.6. If a 34-lb force acting on the bridle is sufficient to restrain the horse, determine the smallest safe length L for the free end of the rein.

The two 200-N blocks are pushed apart by the 15 degrees wedge of negligible weight. The angle of static friction is 10 degrees at all contact surfaces. Determine the force P required to start the blocks moving.

Q1: The tractor has a weight of 4500 lb with center of gravity at G. The driving traction is developed at the rear wheels B, while the front wheels at A are free to roll. If the Q2: The mine car and its contents have a total mass of 9 Mg and a center of gravity at G. If the coefficient of static friction between the wheels and the tracks is u, = 0.4 when the wheels are locked, find the normal force acting on the coefficient of static friction between the wheels at B and the ground is u, = 0.5, determine if it is possible to pull at P = 1350 lb without causing the wheels at B to slip or the front wheels at A to lift off the ground. front wheels at B and the rear wheels at A when the brakes at both A and B are locked. Does the car move? 10 kN 0.9 m G 0.15 m 3.5 ft 1.25 ft 0.6 m- 4 ft -1.5 m- 2.5 ft

I need a process for this problem

The crane truck has a weight of 10750 lb and a center of gravity at point . The parking brake only locks the rear wheels of the truck, so the front wheels are free to rotate. Determine the maximum force F applied at the angle 0 = 36° that can be exerted on the crane without it slipping or tipping for each of the following cases: Case 1: The static friction coefficient between the rear tires and the ground is μ = 0.060. Case 2: The static friction coefficient between the rear tires and the ground is μ. = 0.35. h CGD . п d k a жь D с LL BY NC SA 2013 Michael Swanbom ၅၁ Values for dimensions on the figure are given in the following table. Note the figure may not be to scale. Variable Value a 5 ft b 9 ft с 5.5 ft d 3.5 ft h 11 ft For Case 1, the constraint is Select an answer Fmax lbs. For Case 2, the constraint is Select an answer F max lbs. and and

Determine the range of the force P required to keep the system stationary. P acts parallel to theground, and the coefficients of static friction at the contacting points are ?? = 0.2, ?? = 0.3,and ?? = 0.4. Both the 100-kg roller and 40-kg hollow cylinder have a radius of 150 mm (useg = 9.81 m/s2).