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lhecker007
13.03.2020 •
Physics
An anchor weighing 105 lb in water is attached to a chain weighing 3 lb/ft in water. Find the work done to haul the anchor and chain to the surface of the water from a depth of 35 ft.
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Ответ:
The weight of the anchor is 105 lb
The chain weights 3 lb/ft
The length of the chain to be hauled up be y
Therefore the total work done is 5336 ft-lbs
Explanation:
The weight of the anchor is 105 lb
The chain weights 3 lb/ft
The length of the chain to be hauled up be y
So the combined weight is
==> (3)(35-y)+100=(205-3y)
Consider a small section of chain of length Δy
The work done by a small section is (205-3y)(Δy)
Total work done to haul up the anchor and the chain can be calculated as
W=∫₀³⁵(205-3y)Δy
=(175y-3y²/2)²⁵
=(205(35)-3(35²-0)/2)
=5336
Therefore the total work done is 5336 ft-lbs
Ответ: