How many cubic meters of earth must be dug out to sink a well which is 20 m deep and has a diameter of 7 meters? If the earth so dug out is spread over a rectangular plot 28 m by 11 m,what is the height of the platform so formed?
Answers
Answered by
150
We first get the volume of the soil dug out by getting the volume of the hole dug.
Volume=3.142×3.5^2×20=769.79
769.79m3
The area of the field is=28×11=308m2
The soil level =769.79/308=2.499m
2.499m
Volume=3.142×3.5^2×20=769.79
769.79m3
The area of the field is=28×11=308m2
The soil level =769.79/308=2.499m
2.499m
Answered by
232
Answer:
Volume of cylinder = 22/7 r*r*h
Height =20m
Diameter =7m
radius=7/2 =3.5
Volume = 22/7 *3.5*3.5*20
=770 cu cm
Area of rectangle = l*b
Area of the rectangular plot = 28 * 11
=308 sq m
Height = volume / l*b
=770/308
=2.5m
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