Elements Of Electromagnetics
7th Edition
ISBN: 9780190698614
Author: Sadiku, Matthew N. O.
Publisher: Oxford University Press
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4-79. The man has a mass of 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 u) = 0.4 and between his backside and the rock, = 0.3, determine the smallest horizontal force his body must exert on the rock in order to do this.
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- A chain having a length L and weight W rests on a street for which the coefficient of static friction is us. If a crane is used to hoist the chain, determine the force P it applies to the chain if the length of chain remaining on the ground begins to slip when the horizontal component is Px. What length of chain remains on the ground? Given: L = 20 ft W = 8lb/ft = 0.2 us= : 10 lb Px =arrow_forward8-26. The refrigerator has a weight of 180 lb and rests on a tile floor for which us = 0.25. If the man pushes horizontally on the refrigerator in the direction shown, determine the smallest magnitude of horizontal force needed to move it. Also, if the man has a weight of 150 lb, determine the smallest coefficient of friction between his shoes and the floor so that he does not slip. -3 ft- F15 ft- 4 ft 3tarrow_forwardThe 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 ftarrow_forward
- Force P is applied to the end of a rope being used to hold the 50-lb block on the 20° incline. The coefficient of static friction between the block and the incline is u. = 0.30. Determine the largest value of P for which the block is in equilibrium and will not begin to move up the incline when 0 = 15°. Hs = 0.30 20° The solution to this problem requires a free-body diagram of the block, and a sketch of the coordinate system used. Use the components of the forces with EF = 0 and EF, = 0 to y apply ΣF=0.arrow_forwardQ4: The 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 (H) = 0.24 F=30N T=60N 30 40 Kgarrow_forwardThe 185-lb man with center of gravity G supports the 83-lb drum as shown. Find the greatest distance x at which the man can position himself without slipping if the coefficient of static friction between his shoes and the ground is 0.43. 15' 83 lb Answer: x = tel ft T 3.3'arrow_forward
- If the coefficient of static friction at the contact points A and B is μs = 0.4, determine the following if the girl is 75-lb and the plank is 20-lb:1. Reaction at A (in lb) (ANSWER: 90.4) and Reaction at B (in lb) (ANSWER: 60.2). 2. The minimum distance d (in ft) can a girl stand on the plank without causing it to slip. (ANSWER: 2.23).arrow_forwardThe refrigerator has a weight of 368 lb and rests on a tile floor for which us = 0.3. Also, the coefficient of static friction between the floor and the man's shoes is us = 0.5. If he pushes horizontally on the refrigerator, how much does he need to weigh in order to move the refrigerator? 4 ft -3 ft- -1.5 ft- --- JA 3 ftarrow_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 T-60N 30 40 Kg 45 F=30Narrow_forward
- The pickup truck pulls the wooden crate, as shown in Figure 2. The truck has a mass of 1.25 Mg and a center of mass at G. The coefficient of static friction between the truck's wheel and the ground is µ = 0.5, and between the wooden crate and the ground is µs' = 0.4. Determine the greatest weight of the wooden crate the pickup truck can pull if: a) the truck has rear-wheel drive while the front wheels are free to roll, and b) the truck has four-wheel drive.arrow_forwardCould you go step by step on how to solve this problem. I've been tackling it for the past few hours and I can't seem to get it quite right.arrow_forward
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