PEARSON ETEXT ENGINEERING MECH & STATS
15th Edition
ISBN: 9780137514724
Author: HIBBELER
Publisher: PEARSON
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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 light bar is used to support the
50-kg block in its vertical guides. If
the coefficient of static friction is
0.30 at the upper end of the bar and
0.40 at the lower end of the bar, find
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for x = 75 mm. Also find the maximum
value of x for which the bar will not
slip
50 kg
A
300 mm
The 4-lb pulley has a diameter of 1 ft and the axle has a diameter of 1 in. If the
coefficient of kinetic friction between the axle and the pulley is μ = 0.20, determine the vertical
force P on the rope required to lift the 20-lb block at constant velocity.
P
6 in.
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- The spool of wire having a weight of 300 lb rests on the ground at B and against the wall at A. Determine the 3 ft normal force acting on the spool at A if P = 300 Ib. The coefficient of static friction between the spool and the ground at B is µ, = 0.35. The wall at A is smooth. ift B.arrow_forwardroll of paper has a uniform weight of 2kN and is suspended from the wire hanger so that it rests against the wall. If the hanger has a negligible weight and the bearing at O can be considered frictionless, determine the force P needed to start turning the roll if = 30°. The coefficient of static friction between the wall ܬܐ and the paper is µ = 0.3.arrow_forwardDetermine the smallest force the man must exerton the rope in order to move the 80-kg crate Also,what is the angle θ at this moment? Thecoefficient of static friction between the crate andthe floor is μs = 0.3.arrow_forward
- 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.arrow_forwardThe 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.arrow_forwardThe 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 ? ?arrow_forward
- Find the smallest distance d for which the hook will remain at rest when acted on by the force P. Neglect the weight of the hook, and assume that the vertical wall is frictionless.arrow_forwardThe rope running over two fixed cylinders carries the 4-kg mass at one end. Determine the force P that must be applied to the other end to initiate motion. The coefficient of static friction between the rope and the cylinders is 0.15. 50 mm 150 mm 400 mm 4 kg O 64.1 N 63.1 N 65.1 N O 62.1 Narrow_forward4. The mine car and its contents have a total mass of 6000 kg and a centre of gravity at G. If the coefficient of static friction 10 kN between the wheels and the 0.9 m •G tracks is u = 0.4 when the wheels are locked, find the normal force acting on the front wheels at B and the rear 0.15 m 0.6 m - 1.5 m wheels at A when the brakes at both A and B are locked. Does the car move? [Ans. NA = 16.5 kN, Ng =42.3 kN, the car does not move] %3D lyparrow_forward
- 3. The ladder has a uniform weight of 80 lb and rests against the wall at B. If the coefficient if static friction at A and B is µ = 0.40, determine the smallest angle 0 at which the ladder will not slip. 15 ftarrow_forward1. If the spring is compressed a distance 6 and the coefficient of static friction between the tapered stub S and the slider A is sA, determine the horizontal force P needed to move the slider forward.The stub is free to move without friction within the fixed collar C. The coefficient of static friction between A and surface B is µAB. Neglect the weights of the slider and stub. Given: 8 = 60 mm HsA = 0.5 HAB = = 0.4 N k = 300 e = 30 deg Barrow_forwardThe uniform box shown in next figure, has a mass of 40 Kg. If the two forces T 60 N and F 30 N are applied on the box, determine if it remains in equilibrium. The coefficient of static friction (u) = 0.24 F=30N T=60N 30 40 Kgarrow_forward
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