Conservation of Angular Momentum A collapsing Star


by dsmwc8
Tags: angular, collapsing, conservation, momentum, star
dsmwc8
dsmwc8 is offline
#1
Oct31-07, 08:42 PM
P: 1
[b]1. After a collapsing star decreases its radius to half its initial size, predict what will happen to its angular velocity(Assume uniform density at all times)Your answer describes the high angular speed of neutron stars. Find the change in the rotational kinetic energy of the star. Where does the energy come from?



I=2/5MR^2 I think the energy comes from the force of the stars own gravity,

I also thought that the angular velocity would increase but I don't know how to find the change in kinetic energy. Any clear explanation would be great, I think I am on the right track but need a little help.



3. The attempt at a solution
Phys.Org News Partner Science news on Phys.org
Better thermal-imaging lens from waste sulfur
Hackathon team's GoogolPlex gives Siri extra powers
Bright points in Sun's atmosphere mark patterns deep in its interior
Dick
Dick is offline
#2
Oct31-07, 09:51 PM
Sci Advisor
HW Helper
Thanks
P: 25,168
You are completely correct about the source of the energy. Find the change in angular velocity using conservation of angular momentum. Use the change in angular velocity to find the change in rotational kinetic energy.


Register to reply

Related Discussions
Law of the Conservation of Angular Momentum > Principle of Conservation of Momentum General Engineering 0
Collapsing Star Introductory Physics Homework 1
Conservation of angular momentum Introductory Physics Homework 4
Conservation of Angular Momentum Introductory Physics Homework 4
conservation of angular momentum Introductory Physics Homework 1