*The radius of gyration (r) for a hollow cylinder with an outer radius R and an inner radius r is approximately half of the difference between the outer and inner radii, given by r ≈ (R – r) / 2. This measurement represents the distribution of mass or area relative to an axis and is used in structural analysis.*

## Radius of Gyration Calculator Hollow Cylinder

Inner Radius (R_{i}): Calculate

Radius of Gyration (k) is:

Certainly! Here’s a table summarizing the formula for calculating the radius of gyration (r) of a hollow cylinder with relevant information:

Symbol | Parameter Description | Formula |
---|---|---|

r | Radius of Gyration | r ≈ (R – r) / 2 |

R | Outer Radius of the Hollow Cylinder | |

r | Inner Radius of the Hollow Cylinder |

The radius of gyration (r) is approximately equal to half of the difference between the outer radius (R) and the inner radius (r) of the hollow cylinder. It represents how the mass or area is distributed relative to a specific axis and is a key parameter in structural analysis.

## FAQs

**What is radius of gyration in hollow circular section?**

The radius of gyration (r) for a hollow circular section is a measure of how the mass or area is distributed relative to a specific axis. It is typically used in structural engineering and mechanics to calculate properties like moment of inertia and section modulus. For a hollow circular section, it represents the distance from the center of the section to an equivalent point where the entire area (or mass) can be concentrated without changing its moment of inertia.

**What is the moment of inertia of a circular hollow section?**

The moment of inertia (I) of a circular hollow section can be estimated as follows:

I ≈ π/4 * (R^4 – r^4)

Where:

- I is the moment of inertia.
- R is the outer radius of the circular hollow section.
- r is the inner radius of the circular hollow section.

**How do you find the area of a circular hollow section?**

The area (A) of a circular hollow section can be estimated as follows:

A ≈ π * (R^2 – r^2)

Where:

- A is the area.
- R is the outer radius of the circular hollow section.
- r is the inner radius of the circular hollow section.

**What is the elastic section modulus of a circular hollow section?**

The elastic section modulus (S) of a circular hollow section can be estimated as follows:

S ≈ π/32 * (R^4 – r^4) / R

Where:

- S is the elastic section modulus.
- R is the outer radius of the circular hollow section.
- r is the inner radius of the circular hollow section.

**How do you find the radius of gyration of a circle?**

The radius of gyration (r) of a circle with respect to its centroidal axis is equal to half of its radius (r = R/2).

**What is the moment of inertia for hollow shapes?**

The moment of inertia for hollow shapes depends on the specific shape and dimensions. For example, in the case of a hollow circular section, you can use the formula mentioned earlier. The moment of inertia represents how the mass or area is distributed relative to a given axis and is crucial in structural analysis.

**What is the moment of inertia of a hollow cylinder about a tangent?**

The moment of inertia of a hollow cylinder about a tangent (I_tan) can be estimated as follows:

I_tan ≈ π/4 * (R^4 – r^4)

Where:

- I_tan is the moment of inertia about a tangent.
- R is the outer radius of the hollow cylinder.
- r is the inner radius of the hollow cylinder.

**What is the formula for the inertia of a hollow ball?**

The moment of inertia of a hollow sphere (I) can be estimated as follows:

I ≈ (2/3) * π * (R^5 – r^5)

Where:

- I is the moment of inertia.
- R is the outer radius of the hollow sphere.
- r is the inner radius of the hollow sphere.

**What is the formula for the surface of a hollow cylinder?**

The formula for the surface area of a hollow cylinder (A) is:

A ≈ 2πh(R + r)

Where:

- A is the surface area.
- R is the outer radius of the hollow cylinder.
- r is the inner radius of the hollow cylinder.
- h is the height of the hollow cylinder.

**What is the formula for the surface area of a hollow circular cylinder?**

The formula for the surface area of a hollow circular cylinder is the same as the one for the surface of a hollow cylinder, as mentioned above.

**What is the formula for surface area of a hollow cylinder closed at one end?**

The formula for the surface area of a hollow cylinder closed at one end would depend on the specific shape of the closure. Without additional information, a general formula cannot be provided.

**What is the radius of gyration and section modulus?**

The radius of gyration (r) is a measure of how the mass or area is distributed in a shape relative to a specific axis. The section modulus (S) is a measure of a shape’s resistance to bending about a particular axis. It is related to the radius of gyration and is often used in structural engineering to determine the strength of a structural member.

**What is the formula for the bending of a hollow tube?**

The formula for the bending of a hollow tube or cylinder would involve the moment of inertia, the applied load, and the distance from the centroidal axis to the point where the bending is occurring. The exact formula depends on the specific geometry and loading conditions of the tube.

**Is elastic section modulus the same as Young’s modulus?**

No, elastic section modulus (S) and Young’s modulus (E) are not the same. Elastic section modulus is a property of a structural shape and measures its resistance to bending about a specific axis. Young’s modulus, on the other hand, is a material property that represents the stiffness or elasticity of a material itself.

**What is the formula for radius of gyration example?**

The formula for the radius of gyration is generally given as:

r = √(I / A)

Where:

- r is the radius of gyration.
- I is the moment of inertia.
- A is the area or mass distribution.

**Why do we calculate radius of gyration?**

The radius of gyration is calculated to determine how the mass or area of a shape is distributed relative to a given axis. It is essential in engineering and mechanics for analyzing the strength and stability of structures, especially when subjected to bending or torsional loads.

**What is the radius of gyration of a solid cylinder?**

The radius of gyration (r) of a solid cylinder with respect to its central axis is equal to half of its radius (r = R/2), where R is the radius of the cylinder.

**What is the radius of gyration of a shape?**

The radius of gyration of a shape represents the distance from a specific axis to an equivalent point where the entire area (or mass) can be concentrated without changing its moment of inertia. It is a measure of how the mass or area is distributed within the shape.

**What is the radius of gyration of a sphere?**

The radius of gyration (r) of a solid sphere with respect to any axis passing through its center is equal to (2/5) times its radius (r = (2/5)R), where R is the radius of the sphere.

**Does a hollow cylinder have a lower moment of inertia?**

A hollow cylinder typically has a lower moment of inertia than a solid cylinder with the same outer radius because some of its material has been removed, reducing its resistance to bending about a specific axis.

**How to calculate the second moment of inertia for a hollow cylinder?**

The second moment of inertia (also known as the moment of inertia or area moment of inertia) for a hollow cylinder can be estimated as follows:

I ≈ π/4 * (R^4 – r^4)

Where:

- I is the second moment of inertia.
- R is the outer radius of the hollow cylinder.
- r is the inner radius of the hollow cylinder.

**What is the formula for a hollow sphere in physics?**

The formula for the moment of inertia of a hollow sphere in physics is:

I ≈ (2/3) * m * (R^2 + r^2)

Where:

- I is the moment of inertia.
- m is the mass of the hollow sphere.
- R is the outer radius of the hollow sphere.
- r is the inner radius of the hollow sphere.

**How do you find the radius of a cylinder?**

To find the radius of a cylinder, you need to measure the distance from the center of the cylinder to its outer edge. This measurement is the radius (R) of the cylinder.

**How do you find the surface area and volume of a cylinder?**

The surface area (A) and volume (V) of a cylinder can be estimated as follows:

Surface Area (A): A ≈ 2πRh + 2πr^2

Volume (V): V ≈ πr^2h

Where:

- R is the outer radius of the cylinder.
- r is the inner radius of the cylinder.
- h is the height of the cylinder.

**What is the volume of a hollow cylinder?**

The volume (V) of a hollow cylinder can be estimated as follows:

V ≈ πh(R^2 – r^2)

Where:

- V is the volume.
- R is the outer radius of the hollow cylinder.
- r is the inner radius of the hollow cylinder.
- h is the height of the hollow cylinder.

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