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

[noeinstein]

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

 

[cristo]

Check your k component of 2AxB

 

[noeinstein]

looks like i was in the write spot sorry. checking...

 

[noeinstein]

isn't k irrelavtant considering Cz is zero

 

[noeinstein]

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

 

[dynamicsolo]

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!