Finding the derivative of the radial vector r

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SUMMARY

The discussion focuses on finding the derivative of the radial vector r in the context of physics and calculus. The equation presented, r = (dr/dt)u_r + r(du_r/dt), illustrates how to express the derivative of the radial vector in terms of its magnitude and direction. It is established that the derivative of r is constant only when the object is at rest or moving in a circular path. This highlights the importance of understanding both the magnitude and direction when differentiating radial vectors.

PREREQUISITES
  • Understanding of vector calculus
  • Familiarity with radial vectors and their components
  • Knowledge of derivatives and their applications in physics
  • Basic grasp of motion in circular paths
NEXT STEPS
  • Study vector calculus, focusing on derivatives of vector functions
  • Learn about the implications of motion in circular paths on radial vectors
  • Explore applications of the chain rule in multivariable calculus
  • Investigate the relationship between magnitude and direction in vector differentiation
USEFUL FOR

Students studying physics or mathematics, particularly those focusing on vector calculus and motion dynamics, will benefit from this discussion.

zachdr1
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Homework Statement


How do you find the derivative of the radial vector r

Homework Equations


r [/B]= ru'_r + ru_r

<b>r = </b>\frac{dr}{dt}<b>u_r</b> + r\frac{d<b>u_r</b>}{dt}

can't get latex to work either

The Attempt at a Solution


[/B]
If r is the magnitude of r, how would you find the derivative of it? Wouldn't it be constant?
 
Last edited:
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zachdr1 said:
If r is the magnitude of r, how would you find the derivative of it? Wouldn't it be constant?
It would be constant only if the object is at rest or moving in a circle.
 

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