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Question 1210251: I iron pipe has a cross section, the iron being 1cm thick. The mass of 1cm3 of cast iron is 7.2g. Calculate the mass of a 2metre length of the pipe
Found 2 solutions by ikleyn, greenestamps:
Answer by ikleyn(52781)   (Show Source):
You can put this solution on YOUR website! .
I iron pipe has a cross section, the iron being 1cm thick.
The mass of 1cm3 of cast iron is 7.2g.
Calculate the mass of a 2metre length of the pipe
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To solve the problem, multiply the cast iron density of 7.2 g/cm^3 by the volume of the metal.
To find the volume of the metal, multiply the cross-section area of the pipe by its length
in consistent units.
To find the area of the cross-section of the pipe, from the greater area of the circle subtract
the area of the smaller circle.
To find the areas of circles in cross-section, the radii or diameters are needed
(since the thickness of the pipe is given, any one of the two radii/diameters should be given).
But neither radius nor diameter of the pipe is given in the post, making the problem like
a three-leg horse.
I am very disappointed by inaccuracy of the person, who created this three-leg horse problem
and disseminates it in the Internet.
It is inappropriate level to communicate with the tutors, posting them crippled tasks.
Answer by greenestamps(13200)  (Show Source):
You can put this solution on YOUR website!
There is not enough information to get an answer.
In addition to knowing the length of the pipe and the thickness of the iron, we need to know either the inside or outside diameter (or radius) of the pipe.
Re-post, showing all the required information.
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