Conservation of Angular Momentum

  • Thread starter lmc489
  • Start date
  • #1
14
0

Homework Statement


Two disks with moments of inertia I and 31 are mounted on a common shaft with frictionless bearings. They are initially rotating with angular speeds of w and 2w. They are brought together without being disturbed. What is their final KE as a fraction of their initial KE?

The answer is 49/52 but i dont understand the concept of it.
can someone please explain?

Equations:
Angular Momentum: Iw = Iw
 

Answers and Replies

  • #2
hage567
Homework Helper
1,509
2
You will need to use conservation of angular momentum and conservation of rotational energy.

Start by writing out these quantities for each disk and then when the disks are brought together.
 

Related Threads on Conservation of Angular Momentum

Replies
0
Views
3K
Replies
15
Views
760
Replies
46
Views
2K
  • Last Post
Replies
3
Views
1K
  • Last Post
Replies
13
Views
2K
  • Last Post
Replies
3
Views
1K
  • Last Post
Replies
0
Views
1K
  • Last Post
Replies
13
Views
2K
  • Last Post
Replies
20
Views
448
  • Last Post
Replies
1
Views
2K
Top