• Support PF! Buy your school textbooks, materials and every day products Here!

A question about Centre of Gravity

  • #1

Homework Statement


A uniform disc A of radius 2m is cut as shown in the figure. The cut out is also a disc of radius 1m. O is the centre of gravity of disc A before cutting and O' is its centre of gravity after cutting. Find the distance between O and O'


Homework Equations





The Attempt at a Solution


I know how to find the CG of disc A and the CG of the new disc respectively..
But i don't know how to find out the CG of the newly cut disc A...
I don't know what approach should I use in this question

Can anyone help me please?
 

Attachments

Answers and Replies

  • #2
can someone help me please?
 
  • #3
SGT
can someone help me please?
Without viewing your attachment nobody can help you.
 
  • #4
1,357
0
can someone help me please?
First question: How do you find the center of gravity of an object?
 
  • #5
Doc Al
Mentor
44,892
1,143
I know how to find the CG of disc A and the CG of the new disc respectively..
But i don't know how to find out the CG of the newly cut disc A...
I don't know what approach should I use in this question
I assume you can find the center of mass of two overlapping solid discs. Hint: What kind of disc would you have to add to disc A to get a hole of the right size and placement? Hint2: A + -B = A - B (It's a mathematical trick!)
 
  • #6
I assume you can find the center of mass of two overlapping solid discs. Hint: What kind of disc would you have to add to disc A to get a hole of the right size and placement? Hint2: A + -B = A - B (It's a mathematical trick!)
I know how to do it now~ Thanks a lot
 

Related Threads for: A question about Centre of Gravity

  • Last Post
Replies
2
Views
3K
  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
12
Views
3K
Replies
7
Views
422
Replies
8
Views
2K
  • Last Post
Replies
5
Views
2K
  • Last Post
Replies
10
Views
11K
Top