A 75-kg man starts climbing a ladder that leansIf the weight of theagainst a wall as shown in Fig.ladder is negligible, determine how far up the ladder theman can climb before the ladder starts to slip ifThe coefficient of friction at the bottom end of the lad-der is increased to 0.40 by placing a piece of rubberbetween the ladder and the floor.5 m60°

Given Mass of body = 75 kg Length of the ladder = 5 m Friction coefficient = 0.4 Angle of…

Answered: A 75-kg man starts climbing a ladder…

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

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A 260-kg block is resting on a 29 deg inclined plane with a coefficient of friction = 0.68. Find the required horizontal force P (kN) that is necessary to start the block UP the incline.
A 85-kg man starts climbing a ladder that leans against a wall as shown in Figure Q1. If the ladder is 5 m long and weighs 10 kg. Determine how far up the ladder the man can climb (in m) before the ladder starts to slip if the coefficient of friction is 0.25 at the top vertical surface and 0.4 at the bottom horizontal surface.
A wedge assembly, composed of wedges X and Y, is designed to lift crate W whose weight is 1CDE N, as shown in the figure below. What will be the maximum force P that can be applied before movement begins if the coefficient of friction for all surfaces of contact is 0.0875? Draw all necessary free-body diagrams and indicate the direction of impending motion. This is not your it in any way property so do not use were your own. 1CDE N W This is not your own property so do not use it in any way as if it were your own. 1C P property sol The not it in any way if your ow Parameters 1℃° 1D ° 1E ° 1CDE N 13° 14° 15° 1345 N 1Dº of use 1Eº
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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).
Consider the situation shown where a 15-kg box is to be held on a steep vertical slope by a cord that can withstand 80 N. Will the box be held or will the cord snap (i.e. exceed 80 N)? The coefficient of static friction between the box and slope is 0.3. Note: more sophisticated methods exist but do a simple analysis using statics alone and a little reasoning. 60
(b) Determine the inclination of the wedges and the tension of the connecting rope when both bodies is about to move downward as shown in Figure Q2 (b). Given the coefficient of friction of metal safebox and wooden crate are 0.4 and 0.15 respectively. 800 N 400 N 0 Figure Q2 (b)
1. Two blocks respectively A weighs 1800N and B weighs 2500N are connected by a spring both rests on an inclined plane downward to the right at a slope of 3 vertical to 4 horizontal. Their motion is down to the incline and resisted by a force P = 1000N. Their coefficient of friction is 0.30 under A and 0.10 under B. Compute the force in the spring.

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