Calculate Steel Cylinder Mass - 2.5m diam. x 4m length

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Discussion Overview

The discussion revolves around calculating the mass of a hollow steel cylinder with a specified diameter and length. Participants are attempting to address the correct method for determining the mass, considering the cylinder's hollow nature and wall thickness.

Discussion Character

  • Technical explanation
  • Homework-related

Main Points Raised

  • One participant presents an initial calculation for the mass of a hollow cylinder, assuming it to be solid, resulting in a mass of 153153 kg.
  • Another participant points out that the calculation does not account for the hollow nature of the cylinder and emphasizes the need for the wall thickness to adjust the volume calculation.
  • A participant mentions the wall thickness of 8 mm but expresses uncertainty about how to adjust the volume calculation to exclude the hollow part.
  • Another reply suggests subtracting the volume of the inner cylinder from the total volume to find the correct mass of the hollow cylinder.

Areas of Agreement / Disagreement

Participants generally agree that the initial calculation is incorrect due to the hollow nature of the cylinder. However, there is no consensus on the specific method to adjust the calculations based on the wall thickness.

Contextual Notes

The discussion lacks clarity on the definitions of the inner and outer diameters and how to accurately compute the volume of the hollow section. There are also unresolved steps in the mathematical adjustments needed for the calculations.

gimini75
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Hi

I have a problem I want to find the mass of a hollow cylinder which is made of steel, the sylinder diameter is 2.5m, the length is 4m, then I have done my calculations as follow:

Volume of the cylinder = Лd²/4 x h = 19.635 cubic meters

Mass of cylinder = volume x denisity
= 19.635 x 7800 = 153153 kg

This a very big mass I think it's wrong but I don't know why if you know can you help me please?
 
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gimini75 said:
Hi

I have a problem I want to find the mass of a hollow cylinder which is made of steel, the sylinder diameter is 2.5m, the length is 4m, then I have done my calculations as follow:

Volume of the cylinder = Лd²/4 x h = 19.635 cubic meters

Mass of cylinder = volume x denisity
= 19.635 x 7800 = 153153 kg

This a very big mass I think it's wrong but I don't know why if you know can you help me please?
You have calculated the mass of a solid steel cylinder. You need to know the wall thickness of the hollow cylinder, so you can exclude the hollow part in your calculation.
 
Hi
The wall thickness is 8 mm but Iam not sure how to do it? how to exclude it from the calculation?
 
gimini75 said:
Hi
The wall thickness is 8 mm but Iam not sure how to do it? how to exclude it from the calculation?

When you calculate the volume, subtract out the inner diameter.

CS
 

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