plz show me the steps`=)
1) A manufacturer produces concrete drainage pipes. The specifications are as follow:
Outer diameter: 300mm
Inner diameter: 220mm
Length : 2m
a) Find the volume of concrete needed for each pipe. (to 3 decimal places)
b) If the cost of concrete is $100 per m^3, find the cost of each pipe.
c) The manufacturer has an order of 4200 pipes.
:)What is the total volume of concrete needed?
::) What is the total cost of material for this order
Maths(Volume and surface area of a cylinder2) 20marks=D
2008-04-27 8:56 am
回答 (1)
2008-04-27 9:52 am
✔ 最佳答案
I think the answe is like that :)a) Outer diameter = 300mm = 0.3m
Inner diameter = 220mm = 0.22m
Length = 2m
Area of circle = radius^2 x 3.14
So outer circle = (0.3/2)^2 x 3.14 = 0.071m^2
Inner circle = (0.22/2)^2 x 3.14 = 0.038m^2
And then outer – inner = 0.033m^2
Volumn of circle = area x length
0.033 x 2 = 0.066m^3
b) 0.066 x $100 = $ 6.597
c):) 0.066 x 4200 = 277.089m^3
::) 277.089 x $100 = $27708.852
收錄日期: 2021-04-13 15:29:19
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080427000051KK00181