Arc Length Units: Explained & Solved Problem

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SUMMARY

The discussion focuses on the calculation of arc length in relation to a velocity vs time graph, specifically with units of meters per second (m/s) and seconds (s). The formula for arc length is established as arc length = radius * angle, where the angle is measured in radians. Although radians are dimensionless, the resulting unit for arc length is confirmed to be meters. This clarification resolves the confusion regarding the units of arc length derived from the given graph.

PREREQUISITES
  • Understanding of basic geometry, specifically circular motion.
  • Familiarity with the concept of radians as a unit of angular measurement.
  • Knowledge of the relationship between linear and angular velocity.
  • Basic grasp of physics principles related to motion and graph interpretation.
NEXT STEPS
  • Study the relationship between linear velocity and angular velocity in circular motion.
  • Explore the concept of arc length in different contexts, such as in physics and engineering.
  • Learn about the application of radians in various mathematical and physical formulas.
  • Investigate the implications of dimensionless units in scientific calculations.
USEFUL FOR

Students and professionals in physics, mathematics, and engineering who are working with circular motion and need to understand the implications of arc length calculations.

alingy2
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Hello,

I solved the arc length for a particular problem. However, what is the unit of arc length if the units of the velocity vs time graph are m/s vs s?

I am really confused.
 
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Well, suppose you wanted to know the arc length of a portion of a circle; the typical formula is arc length = radius*angle. So the units would be meters*radians in standard SI. Although radians is a dimensionless unit, so you could also say units are just meters.
 

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