For the following three vectors, what is 3C·(2A x B )?

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Homework Help Overview

The discussion revolves around a vector problem involving the calculation of the expression 3C·(2A x B) with given vectors A, B, and C. The participants are exploring the cross product and dot product operations in vector algebra.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • The original poster attempts to compute the expression but receives feedback indicating a potential error in the k component of the cross product. Some participants question the relevance of the k component due to the zero value of Cz.

Discussion Status

The discussion is ongoing, with participants providing feedback on specific calculations and encouraging attention to detail. There is acknowledgment of the original poster's struggles with the assignment, and a reference to another thread for additional context has been shared.

Contextual Notes

Participants note the original poster's frustration and the potential for errors due to fatigue from working on the assignment for an extended period. There is a reminder about the forum's guidelines regarding multiple postings.

noeinstein
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For the following three vectors, what is 3C·(2A x B )?

A = 2.00i + 3.00j - 9.00k
B = -3.00i + 3.00j + 2.00k
C = 5.00i - 8.00j


2AxB=(12+54)+(8-54)+(12-18)

2AxB=66i - 46j -6k

3C·(2AxB)= (66x15)i + (-46x-24)j = 2094

the app is telling me it's incorrect. I don't know what I'm doing wrong! thanks in adv
 
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Check your k component of 2AxB
 
looks like i was in the write spot sorry. checking...
 
isn't k irrelavtant considering Cz is zero
 
correction "right spot". I've been workin on this asssignment all day. I'm losing my attention to detail. Probably why I'm having trouble. lol
 
noeinstein said:
correction "right spot". I've been workin on this asssignment all day. I'm losing my attention to detail. Probably why I'm having trouble. lol

Check this thread: https://www.physicsforums.com/showthread.php?t=185106

and please do not multiply-post a problem in the future!
 
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