Asked by batmo
1.Find vectors v*w if vector v = 5 vector i – 4 vector j + 4 vector k and vector w = –6 vector i + 3 vector j – 2 vector k.
2.Find vectors v*w if vector v = -3 vector i – 4 vector j - 8 vector k and vector w = 2 vector i + 6 vector j + 4 vector k.
2.Find vectors v*w if vector v = -3 vector i – 4 vector j - 8 vector k and vector w = 2 vector i + 6 vector j + 4 vector k.
Answers
Answered by
Steve
v*w has no meaning in common notation.
Do you mean v•w or v×w ?
Do you mean v•w or v×w ?
Answered by
batmo
v times w
Answered by
Steve
i assume you mean cross-product
I'll do #1:
vxw =
| i j k|
|5 -4 4 |
|-6 3 -2|
= 32i-28j+26k
You can make things a lot more readable by just saying you're dealing with vectors. Then you can forget about all those words and just write the values, as in my answer.
I'll do #1:
vxw =
| i j k|
|5 -4 4 |
|-6 3 -2|
= 32i-28j+26k
You can make things a lot more readable by just saying you're dealing with vectors. Then you can forget about all those words and just write the values, as in my answer.
Answered by
batmo
no i don't mean cross product.
3– 4– 2
–14– 9– 4
5+ 3– 4
–4– 14– 9
these are the possible answers. all with IJK following of course.
3– 4– 2
–14– 9– 4
5+ 3– 4
–4– 14– 9
these are the possible answers. all with IJK following of course.
Answered by
Steve
In that case, say dot product.
5i-4j+4k • -5i+3j-2k = -25-12-8 = -45
you say you don't mean cross product, but you give vectors for answers.
dot product of two vectors is just a number.
I'm afraid I don't know what operation you are using.
5i-4j+4k • -5i+3j-2k = -25-12-8 = -45
you say you don't mean cross product, but you give vectors for answers.
dot product of two vectors is just a number.
I'm afraid I don't know what operation you are using.
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