Register to reply

Angular momentum and orbital angular momentum problems

by sebasalekhine7
Tags: angular, momentum, orbital
Share this thread:
Feb4-05, 11:17 PM
P: 23
1. A proton of mass rotates with an angular speed of 2*10^6 rad/s in a circle of radius 0.8m in a cyclotron. What is the orbital angular momentum of the proton?

2.An object's angular momentum changes by 10Kgm/s^2. What magnitude average torque acted on this object?

3. A pulsar which emits radio waves 642 times per second has a mass of 2*10^30 kg and has a radius of only 15km.
a) What is the linear speed of a point on the equator of this pulsar? Ignore relativistic effects.
b) If our sun, with mass 2*10^30 kg and radius 7*10^5 km had the same angular momentum as this pulsar, approximately what would its rotational period be?

BTW, how do I upload an avatar to my profile? I tried in the CP but I didn't find any option that would allow me to do so.
Phys.Org News Partner Science news on
Sapphire talk enlivens guesswork over iPhone 6
Geneticists offer clues to better rice, tomato crops
UConn makes 3-D copies of antique instrument parts
Feb4-05, 11:33 PM
Sci Advisor
PF Gold
Gokul43201's Avatar
P: 11,155
Read this before posting
Feb5-05, 12:55 PM
P: 23
I understand what you mean by your post, but I have little to work with, since we are not having these topics in our physics class, this is independent study for the science league. Let's see, I have [tex]I=2/5MR^2[/tex] , I also have [tex]\omega=v/r[/tex]

I think 3a is like this: Ok, I think I have 3a. it is rotating at [tex](642rev/s)(2\pi rad/rev)(15000m)=V[/tex]

Besides this, I have no idea as to what to do next.

Feb5-05, 06:14 PM
P: 23
Angular momentum and orbital angular momentum problems

Ok, I think I've got question # 1. Is orbital angular momentum =angular velocity*radius^2 ?

Register to reply

Related Discussions
Electron orbital angular momentum Quantum Physics 7
Orbital and Spin angular momentum Advanced Physics Homework 4
Orbital Angular Momentum Advanced Physics Homework 4
Orbital angular momentum Quantum Physics 10