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    Hello

    I have the following question:
    "Express the 2D polar unit vectors e_R (t) and e_\phi (t) in Cartesian coordinates."

    However, my notes only have a tiny bit about different coordinate systems, can anybody help me with this?

    Thanks
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    If you're going from (r, theta) to (x, y), the map puts you at (r*cos(theta), r*sin(theta)). It's just a right-angled triangle. Draw it on a diagram and drop a line down from the point to what would be the x axis in a cartesian system, and you should see how it works.
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    I'd start with a diagram and mark on the two vectors.
 
 
 
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Updated: April 11, 2011
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