15-82. The 20-lb box slides on the surface for whichHk = 0.3. The box has a velocity v = 15 ft/s when it is 2 ftfrom the plate. If it strikes the smooth plate, which has aweight of 10 lb and is held in position by an unstretchedspring of stiffness k = 400 Ib/ft, determine the maximumcompression imparted to the spring. Take e = 0.8 betweenthe box and the plate. Assume that the plate slides smoothly.v = 15 ft/s2 ft

The weight of the box is W1=20 lb. The coefficient of kinetic friction is µk=0.3. The velocity of…

Answered: 15-82. The 20-lb box slides on the…

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 crate, which has a mass of 160 kg, is subjected to the action of the two forces. If it is originally at rest, determine the distance it slides in order to attain a speed of 7 m/s. The coefficient of kinetic friction between the crate and the surface is μk = 0.2.
The 5 lb weigh shone has a velocity of 10 ft/s when it is 3 ft above the spring platform Cables hold the spring at a length of 1 ft.. Ignore the weight of the cables and the platform. The uncompressed length of the spring is 1.75 ft. Determine the maximum additional compression of the spring. 5 lb 10 ft/s 3 ft x, = 0.75 ft. k = 400 lb/ft
The 860-kg motorized unit A is designed to raise and lower the 700-kg bucket B of concrete. Determine the average force R which supports unit A during the 6.2 seconds required to slow the descent of the bucket from 3.6 m/s to 1.0 m/s. Analyze the entire system as a unit without finding the tension in the cable. A B Answer: R = i kN
15-51. The 30-Mg freight car A and 15-Mg freight car B are moving towards each other with the velocities shown. Determine the maximum compression of the spring mounted on car A. Neglect rolling resistance
The uniform slender bar has a mass of 7 kg. If the spring is unstretched when Ⓒ = 0º, determine the magnitude of the reaction force exerted on the bar by pin A when = 45°, if at this instant w = 7 rad/s. The spring stiffness is k = 150 N/m. A 800 mm k = 150 N/m B
The 20-lb box slides on the surface for which μ = 0.3. The box has a velocity v = 15 ft/s when it is 2 ft from the plate. If it strikes the smooth plate, which has a weight of 10 lb and is held in position by an unstretched spring of stiffness k = 400 lb/ft, determine the maximum compression imparted to the spring. Take e = 0.8 between the box and the plate. Assume that the plate slides smoothly. v = 15 ft/s 2 ft
F15-11. Blocks A and B have a mass of 15 kg and 10 kg, respectively. If A is stationary and B has a velocity of 15 m/s just before collision, and the blocks couple together after impact, determine the maximum compression of the spring. 15 m/s k = 10 kN/m
The collar has a mass of 28-kg and slides along the smooth rod. Two springs are attached to it and the ends of the rod as shown. S kA kB: 12 0.25 m Each spring has an uncompressed length of I1=2-m and l2=3-m and stiffnesses k1=51-N/m and k2=176-N/m respectively. Determine the velocity that must be subjected to the collar to generate a compression of 0.7 m
The 750-mm-long spring is compressed by the plate P, which can slide freely on the 600- mm-long vertical bars. The 55.6-kg block is given a velocity of v = 5 m/s when it is x = 2 m above the plate. Determine how far the plate travels down when the block stops momentarily after hitting it. Neglect the mass of the plate. v = 5 m/s P k = 25 kN/m- A h = 2m 600 mm
The small 0.5-kg block slides with a small amount of friction on the circular path of radius r = 3.1 m in the vertical plane. If the speed of the block is 5.6 m/s as it passes point A and 3.9 m/s as it passes point B, determine the normal force exerted on the block by the surface at each of these two locations. Assume 8 = 39º. Answers: NA = B NB = i i A N !N
When 0=60°, the boy's center of mass G has a speed of 10 ft/s as he swings to the right. Determine the rate of increase in his speed and the tension in each of the two supporting cords of the swing at that instant. The boy has a weight of 60 lb. 10 í

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