Finding the center of mass by integration.

In summary, to find the center of mass of a uniform semicircular disk of radius R, the disk should be divided into slices of thickness dz parallel to the base. The mass of each slice should then be found and integrated over dz to determine the center of mass.
  • #1
tfmfyn
3
0

Homework Statement


Show that the center of mass of a uniform semicircular disk of radius R is at a point 4R/(3(pi)) from the center of the circle.

Homework Equations


Total mass Center of mass = M rcm = m1r1 + m2r2 + ...

The Attempt at a Solution


I do not know how to apply integration to this problem to find the center of mass. Help, please?
 
Physics news on Phys.org
  • #2
Don't you have any integral expressions for center of mass?
 
  • #3
Hi tfmfyn! :smile:

Hint: divide the semicirce into slices of thickness dz parallel to the base, find the mass of each slice, and integrate … something … over dz. :smile:
 

1. What is the center of mass?

The center of mass is a point in an object or system where the mass is evenly distributed in all directions. It is the point where the object can be balanced without tipping over.

2. Why is it important to find the center of mass?

Finding the center of mass can help determine the stability and equilibrium of an object or system. It is also important in understanding the motion and behavior of an object, such as in the fields of physics and engineering.

3. How is the center of mass found by integration?

The center of mass is found by taking the integral of the product of the position and mass of each individual particle in the object or system, divided by the total mass of the object or system.

4. Can the center of mass be outside of the object?

Yes, the center of mass can be outside of the object if the distribution of mass within the object is not uniform. In these cases, the center of mass may be located in empty space.

5. How does the center of mass change with different shapes and sizes of objects?

The shape and size of an object can affect the location of its center of mass. Generally, larger and more spread out objects will have a center of mass that is closer to the geometric center of the object, while smaller and more compact objects may have a center of mass that is offset from the geometric center.

Similar threads

  • Introductory Physics Homework Help
Replies
9
Views
1K
  • Introductory Physics Homework Help
Replies
16
Views
693
  • Introductory Physics Homework Help
Replies
4
Views
570
  • Introductory Physics Homework Help
Replies
19
Views
2K
  • Introductory Physics Homework Help
10
Replies
335
Views
8K
  • Introductory Physics Homework Help
Replies
3
Views
823
  • Introductory Physics Homework Help
Replies
5
Views
919
  • Introductory Physics Homework Help
Replies
5
Views
1K
  • Introductory Physics Homework Help
Replies
6
Views
6K
  • Introductory Physics Homework Help
Replies
8
Views
3K
Back
Top