13–6. The 10-lb block has a speed of 4 ft/s when the forceof F = (81) lb is applied. Determine the velocity of the%3Dblock when t = 2 s. The coefficient of kinetic friction at thesurface is µ = 0.2.13-7. The 10-lb block has a speed of 4 ft/s when the forceof F = (8f²) lb is applied. Determine the velocity of theblock when it moves s = 30 ft. The coefficient of kineticfriction at the surface is µ, = 0.2.v = 4 ft/sF = (8f) lb

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Answered: 13–6. The 10-lb block has a speed of 4…

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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The 11-lb block has a velocity of 3.83 ft/s when the force of F = (257.6t2) lb·ft/sec2 is applied. Determine the acceleration of the block when t = 2.08 s. The coefficient of kinetic friction at the surface is μk = 0.21. Answer is in ft/sec2.
Two blocks A and B have a weight of 11 lb and 6 lb , respectively. They are resting on the incline for which the coefficients of static friction are μA = 0.16 and μB = 0.23. Determine the angle θ which will cause motion of one of the blocks. What is the friction force under each of the blocks when this occurs? The spring has a stiffness of k = 2 lb/ft and is originally unstretched. Determine the smallest angle θ which will cause motion of one of the blocks. Determine is the friction force under the block A at this angle. Determine is the friction force under the block B at this angle.
The 2-kg spool S fits loosely on the inclined rod for which the coefficient of static friction is μ = 0.28. (a) If the spool is located 0.25 m from A, determine the maximum constant speed the spool can have so that it does not slip up the rod. Express your answer to three significant figures and include the appropriate units.
The 490-N force is applied to the 81-kg block, which is stationary before the force is applied. Determine the magnitude and direction of the friction force F exerted by the horizontal surface on the block. The force is positive if to the right, negative if to the left. P = 490 N 28° H. = 0.74 H = 0.57
The 553-N force is applied to the 96-kg block, which is stationary before the force is applied. Determine the magnitude and direction of the friction force F exerted by the horizontal surface on the block. The force is positive if to the right, negative if to the left. H = 0.71 = 0.51 Answer: F = i 35° N P = = 553 N
2. The 10-Ib block has a speed of 4 ft's when the force of F= (8t?) Ib is applied. Determine the velocity of the block when t= 2 s. The coefficient of kinetic friction at the surface is = 0.2. v = 4 ft/s F= (8°) lb
Q/ The 15 lb block A travels to the right at velocity 3 m/s at the in stant shown. If the coefficient of kin etic friction is µ = 0.2 between the surface and A, determine the velocity of A when it has moved 3 ft. Block B has a w eight of 25 lb. A
If the coefficient of kinetic friction between the150-lb crate and the ground is uk = 0.2, %3D determine the speed of the crate when t = 4 s. The crate starts from rest and is towed by %3D the 100-lb force. 100 lb 30°
The truck is traveling at 18 km/h when the trailer coupling at A fails. If the trailer has a mass of 255 kg and it travels a distance of 40 m before coming to a stop, determine the constant horizontal force F created by bearing friction that causes the trailer to stop (in N). NL (O) == O F
F 15° 0.6 m 1 m The crate has a mass of 58 kg and rests on the inclined platform of the truck. Determine the minimum acceleration that will cause the crate to tip over or slide relative to the forklift. What is the magnitude of this acceleration? The coefficient of static friction between the packaging and the truck is µs= 0.7.
7

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