Question

21. The rain water from a roof 22 m by 20 m drains into a conical vessel having the diameter of base as 2 m and height 3.5 m. If the vessel is just full, find the rainfall in mm.

Answer 1

given,
dimensions of roof=22×20m
radius=1m
height=7/2m
then,we know that,
vol. of roof= vol. of cone.
22×20×h=1/3×22/7×1×7/2m
h=25/3mm.