Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and beginning April 20th, 2021 (Eastern Time) the Yahoo Answers website will be in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.
Trending News
Question about moment of inertia?
Let's say we have 2 identical cylinders with the same dimensions,radius,etc... one of them is solid while the other is hollow. If I were to fill the hollow one with water or some other liquid so that its mass will be the same as the solid cylinder (the water is completely still inside and doesn't move) will both cylinders have the same moment of inertia?
1 Answer
- Andrew SmithLv 76 years ago
If the RADIUS of the cylinders is the same and the MASS is the same then doesn't it imply that the density is the same.
Which basically means that both cylinders must be made of pretty much the same material.. WATER.
If you want the same radius but different densities then you need different lengths in which case the moment of inertia for both would then be the same.
If you kept the length the same and altered the radius then the moment of inertia would NOT be the same.
The larger diameter cylinder would have a higher moment of inertia.
Remember that the moment of inertia is based upon how far a mass is from the axis.
