
#1
Feb405, 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. 



#2
Feb405, 11:33 PM

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Sci Advisor
PF Gold
P: 11,154




#3
Feb505, 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. 



#4
Feb505, 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 ?



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