Solve Power-Law Spiral With Angular Momentum L

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SUMMARY

The discussion focuses on deriving the potential energy function V(r) for a particle moving along a spiral path defined by r = C(theta)^k, given a fixed angular momentum L. The key equations involved are L = mr²(θ') and the energy equation E = K + V(r). Participants clarify that θ' represents the time derivative of θ, which establishes a relationship between r and θ-dot. The challenge lies in eliminating r to express the trajectory solely in terms of θ.

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Homework Statement



Given L (angular momentum), find the form of V (r) so that the path of a particle is given by the spiral r = C(theta)k, where C and k are constants

Homework Equations



L = mr2(theta)'

The Attempt at a Solution



I know I have to find a expression for r' using no theta's and insert it into the energy formula E = K + V(r) but I am lost on how to apply it.
 
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Is that prime you have written on theta' in the angular momentum expression the time derivative of theta?

If so, doesn't that give you a relation between r and theta-dot?
The required trajectory is a relation between r and theta. Could you eliminate r between these two and do anything with that?
 

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