Example 17.19. A uniform ladder of weight 250 N and length 5 m is placed against a vertical wall in a position where its inclination to the vertical is 30°. A man weigh- ing 800 N climbs the ladder. At what position will he induce slipping? Take coeficient of friction µ=0.2 at both the contact surfaces of the ladder. %3D

Example 17.19. A uniform ladder of weight 250 N and length 5 m is placed against a vertical wall in a position where its inclination to the vertical is 30°. A man weigh- ing 800 N climbs the ladder. At what position will he induce slipping? Take coeficient of friction µ=0.2 at both the contact surfaces of the ladder. %3D

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

Crate coef of static friction is .55, what is min force to prevent slipping, what is min force to prevent tipping
7.54 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 Cthat 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? 4000 Ib 6000 Ib Figure P7.54 Figure P7.55
The crate shown has a mass of m 20 kg and is being pulled up a plane at 0 25 degrees (to the horizontal) by a cord parallel to the plane, as shown in the following figure: You are given that the coefficient of friction is u = 0.3. State the following: The component of weight parallel to the surface: N. The component of weight perpendicular to the surface: N. The normal reaction: N. The frictional force: N. Calculate the magnitude of the tension, P, in the chord necessary to give an acceleration parallel to the plane of 4 m/s². P is equal to N.
A block of mass M = 109.0 kg on an inclined plane is attached to another block of mass m via a string, as in the figure below. The coefficients of static and kinetic friction for the block and the incline are u, = 0.40 and uy = 0.20 and the plane is inclined 16.9° with horizontal. (a) Determine the range of values for m, the mass of the hanging block, for which the block will not move unless disturbed, but if nudged, will slide down the incline. 73.4 kg s m s.03 kg (b) Determine a range of values for m for which the block will not move unless nudged, but if nudged will slide up the incline. 52.94 kg s m s 10.82 kg eBook
Question 3(a) The non uniform XYZ bar which weighs 155 kg has its centre of gravity G at a distance 4 m from X. This bar rests on a homogeneous crate P. The static coefficient of friction between the bar and the crate is 0.31 while the same between the crate and the floor is 0.22. Determine the mass of the lightest crate P (in kilograms) that can be used to support this non uniform bar in the position shown in Figure 3. The height of the crate is 4.32 m and the length of the bar is 8.59 m. 4 m 3 m - 1 m - Figure 3 Question 3(b) Take an example from everyday life where you can identify the application of the concepts we learn in the "Dry friction" module. Sketch this example and discuss about the effect of friction on that particular scenario. Sketch does not have to be drawn to a scale. (Description should be 250 words or less).
1. A horizontal force, F, pushes a block of mass m against a vertical wall. The coefficient of static friction, μs, is given. Find the minimum horizontal force where the block will just begin to slip.
4. ANSWER WITH CLEAN SOLUTIONS AND WITH FREE BODY DIAGRAM
Please Include complete and prescise FBD for this Problem Thankyouu!
A box rests on a rough table, and is just about to slip when pulled by a string inclined at an angle to the table. If the coefficient of friction is 0-25, find the tension in the string (a) when=45, (b) when a angle of friction.
A uniform ladder 18 ft long and weighing 120 lbs www rests against a smooth wall. The angle between the ladder and the ground is 70°. The coefficient of friction between the ground and the ladder is 0.25. How far up the ladder can a 180 Ibs man walk before the ladder slips?