Calculating Vector Product of A and B

[draotic]

Homework Statement

Given A= i + j (caps) and B=i+k (caps)..what is the value of vector product of A and B?

Homework Equations

The Attempt at a Solution

....
i tried but can't get this one

 

[tiny-tim]

welcome to pf!

hi draotic! welcome to pf!

write it (i + j) x (i + k), and use the distributive law

(ie, expand the brackets! ) …

what do you get? ​

 

[draotic]

hi draotic! welcome to pf!

write it (i + j) x (i + k), and use the distributive law

(ie, expand the brackets! ) …

what do you get? ​

thanx
but i still can't get it
opng brackets: i.i +i.k + j.k + j.i
i.i=0
wat now
please help

 

[tiny-tim]

hi draotic!

(try using the B tag just above the Reply box )

opng brackets: i.i +i.k + j.k + j.i
i.i=0

that's right!

except of course, please use "x" for the vector product (the https://www.physicsforums.com/library.php?do=view_item&itemid=85" ), and "." for the scalar product (the dot product )

i x i = 0

j x i = -i x j = … ? ​

 

[draotic]

hi draotic!

(try using the B tag just above the Reply box )


that's right!

except of course, please use "x" for the vector product (the https://www.physicsforums.com/library.php?do=view_item&itemid=85" ), and "." for the scalar product (the dot product )

i x i = 0

j x i = -i x j = … ? ​

can u hlp me to convert this cross product in i j k form?

 

[tiny-tim]

i don't understand what you mean by " https://www.physicsforums.com/library.php?do=view_item&itemid=85" in i j k form"

 

[draotic]

i don't understand what you mean by " https://www.physicsforums.com/library.php?do=view_item&itemid=85" in i j k form"

means the correct anser is i-j-k
how do i get this?

 

[draotic]

i don't understand what you mean by " https://www.physicsforums.com/library.php?do=view_item&itemid=85" in i j k form"

oops!
sorry sir , i got it now
i m so gr8ful to u
thanks

 

[tiny-tim]

means the correct anser is i-j-k

oh i see!

ok, then i don't understand why you're not getting that answer …

what do you know about cross products?

do you know the meaning of "the https://www.physicsforums.com/library.php?do=view_item&itemid=85" of i and j" ?​

EDIT: oh you got it!