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A well with 10m inside diameter is dug 14m deep. Earth taken out of it is spread all around it tomake an embankment like a hollow cylinder of height 4m. What is the width of the embankment:(a) 5m2(b) 4m(c) 4.3m(d) 6m |
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Answer» Radius of well = 5 mdepth = 14 mvolume of earth taken out =πr² h =π×(5)²×14= 1100 m³now, it is spread to form embankment, which is in the form of hollow cylinder,inner radius, r= 5 mouter radius = 5 +5 = 10 mheight= hthen, 1100 =π×h(10²- 5²)⇒h = 350/75 = 14/3 = 4.67 m |
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