16640
A single particle moving under any conservative central force has at least four constants of motion , the total energy " E " and the three Cartesian components of the angular momentum vector " L " with respect to the origin .
 Cartesian
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Cartesian