Conversion of energy expression from Cartesian to spherical coordinates

AI Thread Summary
The discussion focuses on converting energy expressions from Cartesian to spherical coordinates, specifically deriving equations 1.6 and 1.7 from 1.5. Participants seek a general mathematical procedure for this transformation, particularly for obtaining velocity analogues of terms in the equations. It is noted that the second and third terms in 1.6 and 1.7 represent the squares of angular velocities. The conversation emphasizes the need for a clear method to facilitate coordinate transformations in physics. Understanding these conversions is essential for applying concepts across different coordinate systems.
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A text I am reading displays the attached image. Can someone explain the general method for obtaining the velocity analogues of those terms (in parentheses) in 1.5? I know the second and third terms in parentheses in 1.6 and 1.7 are the squares of angular velocities, but can a general procedure be expressed to convert such equations between arbitrary coordinate frames?

In other words, how may we derive equation 1.6 (or 1.7) from 1.5 in an entirely mathematical sense?

(I am familiar with the coordinate transformations between Cartesian and spherical coordinates)

*In the attachment, a dot indicates over a symbol indicates the time-derivative of the quantity over which it appears.
 

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