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September 22, 2014

September 22, 2014

Posted by **bobjahng** on Tuesday, November 2, 2010 at 7:33pm.

a)What is the magnitude of the ball's velocity relative to Juan?

b)What is the direction of the ball's velocity relative to Juan?

How do you start this off? I found the y component and subtracted it to find the answer for the first part, but it says that my answer is wrong.

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**bobpursley**, Tuesday, November 2, 2010 at 7:43pma) ball relativeground=Juansspeed+ball relative to Juan

13.6Cos32.5N + 13.6Sin32.5E =7.8N+ballrelative to Juan

ball relative to Juan= (13.6Cos32.5-7.8)N+13.6Sin32.5E

so figure out the N component, then magnitude= sqrt (Ncomp^2+Ecomp^2)

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**bobjahng**, Tuesday, November 2, 2010 at 7:55pmi got the right answer for part a (8.18)

now how do i do part b?

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**bobpursley**, Tuesday, November 2, 2010 at 8:27pmyou have the vector:

Ncomp, E component

relative to Juan, going N, so it is E of him by theta, where tantheta=Ecomp/Ncomp

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**billy**, Wednesday, November 3, 2010 at 3:13pmi cant get part b!!!!!!! im completely lost >.<

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**Juan**, Friday, February 17, 2012 at 4:14amHi Chris

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**El Piton**, Friday, February 17, 2012 at 4:15amOn that Kobe System.

Or Linsanity

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**Annie**, Tuesday, September 25, 2012 at 8:46pmMake sure you're putting the parenthesis in the correct place. Such as for part A, the formulas should be:

a) (ball relative ground) = (Juan's speed)+ (ball relative to Juan)

(13.6Cos(32.5))N + (13.6Sin(32.5))E =(7.8)N+(ball relative to Juan)

ball relative to Juan= (13.6(Cos(32.5))-7.8)N+(13.6Sin(32.5))E

so figure out the N component, then magnitude= sqrt (Ncomp^2+Ecomp^2)

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