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Radians can be dropped from a final answer because their units are:
AAlways negative
BAlways fractions
CDimensionless
DVery large ones
Answer & Solution
Correct answer: C. Dimensionless
1. Radians behave differently from metres or seconds.
2. Angular quantities are measured in radians.
3. Units of radians are dimensionless.
4. They appear in any relationship between angular and linear quantities.
5. Being dimensionless is what lets them be dropped.
_Source: OpenStax College Physics for AP Courses 2e (CC BY 4.0), Ch 10 'Rotational Motion and Angular Momentum', sections 10.1-10.7_
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