Relative motion problem (with picture)

AI Thread Summary
The discussion focuses on solving a relative motion problem involving polar coordinates. The user has successfully calculated the velocity (v_b/a) but is struggling with finding the derivatives for r (radius) and theta (angle). They propose using the formula r = sqrt(y^2 + x^2) for r but express confusion about polar coordinates. Participants emphasize the importance of showing attempts at the solution before receiving assistance. Overall, the thread highlights the challenges of applying polar coordinates in relative motion problems.
unknownman
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Homework Statement


http://imgur.com/EcjIa

Homework Equations


I already got the first part (v_b/a) i need to find r dot and theta dot

The Attempt at a Solution


well i got v_b/a. for r I was thinking of using sqrt(y^2 +x^2) at the r and taking derivatives of that. i don't quite understand polar coordinates
 
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You need to show your attempt at the solution. WE cannot give you help until you have shown your own attempts.
 

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