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Old Sep 15th 2010, 11:17 AM   #1
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position vector (review)

If r1 = {3i-4j+3k}m, r2= {4i-5k)m, r3= {3i-2j+5k}m, determine the magnitude and direction of r=2*r1-r2+3*r3.

Should I be executing the following problem in parts? For example,

have r' = 2*r1-r2
then have r = r' +3*r3

?? I have tried finding the answer four different ways and i cant seem to get the right answer. Guidance, please?
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Old Sep 26th 2010, 05:46 AM   #2
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Originally Posted by quantum_enhanced View Post
If r1 = {3i-4j+3k}m, r2= {4i-5k)m, r3= {3i-2j+5k}m, determine the magnitude and direction of r=2*r1-r2+3*r3.

Should I be executing the following problem in parts? For example,

have r' = 2*r1-r2
then have r = r' +3*r3

?? I have tried finding the answer four different ways and i cant seem to get the right answer. Guidance, please?
It would help if you showed your work.

I get r = 11i -14j + 26k.

Magnitude: |r| = ....

Direction: Relative to what?
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