Please solve these 5 questions as soon as possible; need it urgently for notes. Will mark the neat and correct answer brainliest. Will award 15 points.
Answers
Answer:
Step-by-step explanation:
The difference between the diameters of the inner and the outer walls of a 30 cms long pipe is..
17 - 15 cms = 2 cms, this is the thickness of the pipe. The volume of the material used is the difference of the volumes of the Outer Cylindrical Pipe and inner Volume of the Same.
Let's calculate..
Outer volume... π.r².h = 22/7. (17/2)².30 cc. Or…22/7. 289/4.30. = 6812.14 cc.
Inner volume... π.r².h = 22/7.(15/2)².30 cc or…5303.57 cc.
The difference is 1508.57 cc.
Therefore 1508.57 cubic centimeters material was used in making the pipe.
1508.57 cc answer.
here , depth = 14 ft
diameter = 8 feet
so , radius = 4 ft
We will paint it on its C.S.A.
C.S.A. of cylinderical well
= 2πrh
= 2×(22/7)× 4 × 14
= 352 ft²
so ,
cost = rate per unit area × area
= (20/2.5)×352
= 8×352
= 2816
so , cost of painting will be 2816 rupees