nat8475
14.01.2021 •
Mathematics
The water supply uses huge concrete pipes to drain stormwater.
a Find the external radius of a pipe.
b Find the Internal radius of a pipe.
c Find the volume of concrete necessary to make one pipe.
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Ответ:
a. External radius is 0.5 m.
b. Internal radius is 0.45 m.
c. Volume of concrete necessary to make one pipe is 0.37 .
Step-by-step explanation:
a. It can be observed that the diameter of the pipe is 1 m.
External radius =
=
= 0.5
External radius = 0.5 m
b. Internal radius of the pipe can be determined by;
Internal radius =
But,
Internal diameter = 1 m - (2 x 0.05 m)
= 1 m - 0.10 m
= 0.9 m
Internal diameter = 0.9 m
So that,
Internal radius =
= 0.45
Internal radius = 0.45 m
c. Volume of concrete required = h - h
where is the external radius, and is the internal radius.
Volume of concrete required = [ x x 2.5] - [ x x 2.5]
= 1.9643 - 1.5911
= 0.3732
The volume of concrete necessary to make one pipe is 0.37 .
Ответ:
46 percent
Step-by-step explanation: