Question

if vector A = 2i cap + j cap + k cap and vector B = 2i cap + 2j cap + k cap then |vectorA x vectorB|
is
1) √5
2) √7
3) √11
4) √13

please help me
no spams ​

Answer 1

Answer:

hey armie

I armie

here is ur answer✌

If a vector=2i cap-j cap+k cap, b vector=I cap +2j cap -3k cap and c vector=3i cap -yj cap +5k cap are coplanar, what is the value of y?

Ans: If three vectors are coplanar, then their Scalar triple product must vanish. Since a vector, b vector and c vector are coplanar,, so {a vector. (b vector * c vector)} =0 or [ a b c]=0

Find the cross product of b vector and c vector and make a dot product with a vector. Compare the result with zero. You'll get,

7y=28 or y=28/7=4.

So for y=4 , a, b, and c vectors are coplanar.

Answer 2

Answer:

Solly for answering.

It's Nothin dear.

just a small fam probs

Nvm.

Be happy :)

Borahae

Have a Bangtastic night ahead.