12_208 - equation gives: 4 l 6 + constant = s A + 4 s E •...

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Problem 12-208 (page 96) COMPLETION OF PROBLEM 12-208 Rope equations: l 1 + l 2 + l 3 = constant l 4 + l 5 = constant l 6 + l 7 = constant Path equations: l 1 + constant = s A l 2 + l 4 + l 6 + constant = s E l 3 + l 4 + l 6 + constant = s E l 5 + l 6 + constant =s E l 7 + constant =s E Adding the first three path equations and using the first rope equation gives: 2 l 4 + 2 l 6 + constant = s A + 2 s E Adding two times the fourth path equation and using the second rope
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Unformatted text preview: equation gives: 4 l 6 + constant = s A + 4 s E • Adding four times the fifth path equation and using the third rope equation gives: s A + 8 s E = constant so v A + 8 v E = When v A = 2, v E = ! 1/4 . That is, ! v E = 0.250 ft/s up...
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This note was uploaded on 10/26/2010 for the course MATH MATH100 taught by Professor Akos during the Spring '10 term at UBC.

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