Chapter 17, Problem 36P

The mine car and its contents have a total mass of 7.1 Mg and a center of gravity at G . If the coefficient of static friction between the wheels and the tracks is μs = 0.34 when the wheels are locked, find the following: 1 The normal force acting on the front wheels at B is Blank 1 kN when the brakes at both A and B are locked. 2 The normal force acting on the rear wheels at A is Blank 2 kN when the brakes at both A and B are locked. 3 The friction force acting on the front wheels at B is Blank 3 kN when the brakes at both A and B are locked. 4 The friction force acting on the rear wheels at A is Blank 4 kN when the brakes at both A and B are locked. 5 With the given information above, does the car move? Answer with Yes or No only. Blank 5

If each box weighs 150 lb, determine the least horizontal force P that the man must exert on the top box in order to cause motion. The coefficient of static friction between the boxes is μs = 0.54, and the coefficient of static friction between the box and the floor is μ's = 0.24.

The man pushes on the roller with force P through a handle that connects to the central axle of the roller. If the coefficient of static friction between the 43-lb roller and the floor is g = 0.16, determine the maximum force P that can be applied to the handle, so that roller rolls on the ground without slipping. Assume the roller to be a uniform cylinder. Please pay attention: the numbers may change since they are randomized. Your answer must include 2 places after the decimal point, and proper unit. Take g = 32.2 ft/s². Your Answer: Answer 30° units 1.5 ft

Determine the horizontal force P to start the 400-N wedge moving to the right. The angle of friction for all contact surfaces is o = 20°. WA = 2000 N WB = 400 N 15°

The man has a mass, m =. 40 kg. He plans to scale the vertical crevice using the method shown. If the coefficient of static friction between his shoes and the rock is µ = 0.4 and between his backside and the rock is µ = 0.3, determine the smallest horizontal force his body must exert on the rocks in order to do this.

The beam AB has a negligible mass and thickness and is subjected to a triangular distributed loading. It is supported at one end by a pin and at the other end by a post having a mass of 50 kg and negligible thickness. Determine the two coefficients of static friction at B and at C so that when the magnitude of the applied force is increased to P = 150 N, the post slips at both B and C simultaneously. Take F = 940 N/m. (Figure 1) Figure -2 m 400 mm 300 mm Part A Determine the coefficient of static friction at B Express your answer using three significant figures. HB = Submit Part B HC = Submit ΕΠ ΑΣΦ VI Determine the coefficient of static friction at C. Express your answer using three significant figures. Provide Feedback ↓↑ vec • Request Answer Π|| ΑΣΦ ↓↑ Request Answer vec ? ?

The fork lift has a weight of 2,400 lb and a center of gravity at G. If the rear wheels are powered, whereas the front wheels are free to roll, determine the maximum number of 300-lb crates the fork lift can push forward. The coefficient of static friction between the wheels and the ground is μw = 0.4 and between the each crate and the ground μc = 0.35. 2.5 ft 1.25 ft -3.50 ft- XIXIX

The fork lift has a weight of 2400 lb and a center of gravity at G. If the reat wheels are powered, whereas the front wheels are free to roll, determine the maximum number of 300-lb crates the fork lift can push forward. The coefficient of static friction between the wheels and the ground is μ and between the each crate and the ground He a=1.9ft EA b=3.4ft d=2.3ft Uw=0.3 Uc=0.3 d XXX

The square-threaded screw has a mean diameter of 20 mm and a lead of 4 mm. If the weight of the plate A is 5 lb, determine the smallest coefficient of static friction between the screw and the plate so that the plate does not travel down the screw when the plate is suspended as shown.