Derive the r, theta, and phi unit vectors?

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SUMMARY

The discussion centers on deriving the unit vectors \(\hat{r}\), \(\hat{\theta}\), and \(\hat{\phi}\) in spherical coordinates in terms of Cartesian coordinates \(\hat{x}\), \(\hat{y}\), and \(\hat{z}\). Participants clarify that the term "derive" refers to expressing these unit vectors based on the Cartesian system, which is a straightforward process. The conversation highlights a common misunderstanding regarding the depth of derivation required for this problem, emphasizing that it is a basic application of coordinate transformation.

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DJGriffiths, 3rd ed., Prob 1.37: derive the \hat{r}, \hat{\theta}, and \hat{\phi} unit vectors in terms of \hat{x}, \hat{y}, and \hat{z}.

I know the formula and how to find them, but derive them?? ...unless this is what is meant?

tia,
-LD
 
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I believe that is what it meant. Find them in terms of x,y,z.
 
quasar987 said:
I believe that is what it meant. Find them in terms of x,y,z.

Ok! That's easy. Why Griffith used the word "derive" - as if from first principles - is beyond me.

thx, i needed that! :)

-LD
 
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Question: A clock's minute hand has length 4 and its hour hand has length 3. What is the distance between the tips at the moment when it is increasing most rapidly?(Putnam Exam Question) Answer: Making assumption that both the hands moves at constant angular velocities, the answer is ## \sqrt{7} .## But don't you think this assumption is somewhat doubtful and wrong?

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