Question

3 m, find the volume of the timber that
18. A well with 10 m inside diameter is dug 8.4 m deep. Earth taken out of it is spread all around it
to a width of 7.5 m to form an embankment. Find the height of the embankment.
having an area of cross-section of 2​

Answer 1

ANSWER

The volume of earth(soil) taken out which is equal to the volume of Cylinder.

Volume of earth taken out from well = Volume embankment

⇒πr

2

h=π(R

2

2

−R

1

2

)×H

⇒5

2

×8.4=((12.5)

2

−5

2

)×H

⇒H=

131.25

25×8.4

=1.6m