537_Dynamics 11ed Manual

537_Dynamics 11ed Manual - = N B 1 lb = a 1 ft s 2 = Given...

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Engineering Mechanics - Dynamics Chapter 17 Problem 17-45 The van has weight W v and center of gravity at G v . It carries fixed load W l which has center of gravity at G l . If the van is traveling at speed v , determine the distance it skids before stopping. The brakes cause all the wheels to lock or skid. The coefficient of kinetic friction between the wheels and the pavement is μ k. . Compare this distance with that of the van being empty. Neglect the mass of the wheels. Given: W v 4500 lb = b 2f t = W l 800 lb = c 3f t = v 40 ft s = d t = μ k 0.3 = e 6f t = f 2f t = g 32.2 ft s 2 = Solution:
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Unformatted text preview: = N B 1 lb = a 1 ft s 2 = Given N A N B + W v W l = k N A N B + ( ) W v W l + g a = N B f b + c + ( ) W l b c + ( ) + W v c + W l g ae W v g ad + = N A N B a Find N A N B , a , ( ) = N A N B 3777 1523 lb = a 9.66 ft s 2 = d l v 2 2 a = d l 82.816 ft = Unloaded W l 0 lb = Guesses N A 1 lb = N B 1 lb = a 1 ft s 2 = Given N A N B + W v W l = 535...
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