Line integral across a vector field

Click For Summary
The discussion revolves around a problem involving line integrals across a vector field where Green's theorem cannot be applied due to the vector field being undefined at the origin. The user seeks guidance on how to approach the problem given the constraints of the region D not being simply connected. A suggested solution is to break the problem into two separate integrals, evaluating each path individually before combining the results. This method allows for handling the discontinuity in the vector field effectively. The conversation emphasizes the importance of adapting techniques when standard theorems are not applicable.
clandarkfire
Messages
31
Reaction score
0
I've attached the problem as a picture.
Capture.PNG

Generally, this would be a simple problem if I were to apply Green's theorem. But I can't use Green because D would not be a simply connected closed region; the vector field isn't defined at the origin.
Could someone please give me an idea of where to start?
 
Physics news on Phys.org
clandarkfire said:
I've attached the problem as a picture.
View attachment 52525
Generally, this would be a simple problem if I were to apply Green's theorem. But I can't use Green because D would not be a simply connected closed region; the vector field isn't defined at the origin.
Could someone please give me an idea of where to start?

Break it up into two integrals and evaluate each path separately and then add them together.
 
Question: A clock's minute hand has length 4 and its hour hand has length 3. What is the distance between the tips at the moment when it is increasing most rapidly?(Putnam Exam Question) Answer: Making assumption that both the hands moves at constant angular velocities, the answer is ## \sqrt{7} .## But don't you think this assumption is somewhat doubtful and wrong?

Similar threads

Replies
3
Views
2K
  • · Replies 2 ·
Replies
2
Views
4K
  • · Replies 6 ·
Replies
6
Views
2K
  • · Replies 7 ·
Replies
7
Views
2K
  • · Replies 5 ·
Replies
5
Views
2K
Replies
12
Views
2K
  • · Replies 3 ·
Replies
3
Views
1K
  • · Replies 24 ·
Replies
24
Views
3K
Replies
12
Views
4K