Because it is a ratio of two lengths, the radian measure is:
ADiscontinuous
BDimensionless
CDirectionless
DDisplacement
Answer & Solution
Correct answer: B. Dimensionless
1. Arc length and radius are both measured in metres.
2. Dividing one by the other cancels the units.
3. So the radian is dimensionless.
_Source: OpenStax University Physics Volume 1, Chapter 10, Fixed-Axis Rotation._
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