Yahoo Answers: Answers and Comments for Calculus problem please help? [Mathematics]
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From rebecca
enUS
Fri, 20 Sep 2019 01:28:23 +0000
3
Yahoo Answers: Answers and Comments for Calculus problem please help? [Mathematics]
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https://answers.yahoo.com/question/index?qid=20190920012823AAwvEwi
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From Pope: I suppose the rope is initially hanging vertic...
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Fri, 20 Sep 2019 08:51:35 +0000
I suppose the rope is initially hanging vertically, reaching 70 feet from the roof edge. Then after being pulled in, only a 60foot length of it is hanging down, and the other ten feet are lying flat on the roof. In that case, the work must be equal to the work required to move the bottom ten feet up to the roof.
When the lower ten feet of the rope hangs from 60 feet to 70 feet below the roof edge, its centroid is 65 feet down.
weight of ten feet of rope = (10/70)(28 lb) = 4 lb
work = (displacement)(force) = (65 ft)(4 lb) = 260 ftlb

From ted s: integrate over y in [ 0 , 10 ] of { (28/70)( 7...
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https://answers.yahoo.com/question/index?qid=20190920012823AAwvEwi
Fri, 20 Sep 2019 03:26:50 +0000
integrate over y in [ 0 , 10 ] of { (28/70)( 70  y ) y dy }.....force x distance

From johnny: is that physics? not sure if it is the right s...
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Fri, 20 Sep 2019 03:13:07 +0000
is that physics? not sure if it is the right subject