Expressing Angular Momentum in Units

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Homework Help Overview

The discussion revolves around the expression of angular momentum and its units, particularly in relation to angular velocity and kinetic energy. The subject area includes concepts of rotational dynamics and units of measurement in physics.

Discussion Character

  • Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • The original poster attempts to determine the units of angular momentum based on the formula L=Iω, questioning if Kgm²*rad/s is a suitable expression. Some participants suggest alternative unit expressions, such as N*m*s, and discuss the relevance of including radians.

Discussion Status

The discussion has seen participants affirming the validity of expressing angular momentum in different units, with some exploring the implications of omitting the radian unit. There is an ongoing exploration of related concepts, such as kinetic energy, but no consensus has been reached on the best unit expression.

Contextual Notes

Participants are navigating the nuances of unit expressions and their implications in the context of angular momentum and kinetic energy calculations.

KiNGGeexD
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If the units of angular velocity, ω, is expressed in rad/a what then is the units of angular momentum?

L=Iω

From this I can gather that the units are

Kgm^2*rad/s

Is this a suitable way to express angular momentum?
 
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Yes you can express it as such. You can similarly express it N*m*s. You can sort of leave out the radian unit if you wish as that is basically a ratio of arc length to radius.
 
So if from that I calculated Kinetic energy using

E=1/2 I*ω^2

Where I=1/2MR^2
 
KiNGGeexD said:
So if from that I calculated Kinetic energy using

E=1/2 I*ω^2

Where I=1/2MR^2
Yes.
 
:) ok thanks
 

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