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juliannabartra
20.07.2021 •
Mathematics
A construction crane lifts a bucket of sand originally weighing 145 lbs at a constant rate. Sand is lost from the bucket at a constant rate of .5lbs/ft. How much work is done in lifting the sand 80ft?
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Ответ:
Step-by-step explanation:
Given
Initial weight of the bucket is![145\ lb](/tpl/images/1396/6392/22422.png)
It is lifted at constant rate and rate of sand escaping is![0.5\ lb/ft](/tpl/images/1396/6392/2e75d.png)
At any height weight of the sand is![w(h)=145-0.5h](/tpl/images/1396/6392/b714b.png)
Work done is given by the product of applied force and displacement or the area under weight-displacement graph
from the figure area is given by
Ответ: