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Can anyone help me to solve this problem.thanks It is regarding the vectors.its my asaignment but I am not good in maths so if anybody willing to help me.

Can anyone help me to solve this problem.thanks
It is regarding the vectors.its my asaignment but I am not good in maths so if anybody willing to help me.

Question Image
Grade:12

2 Answers

Saurabh Koranglekar
askIITians Faculty 10341 Points
one year ago
Dear student

Please ask only one question per post

1 you have to take square of individual element and add them finally take the square root of the answer

2 to find unit vector you have to divide the vector by its magnitude

Regards
Vikas TU
14149 Points
one year ago
Dear student 
Here is the solution of Q 7 
a = 2i + j + k 
b = i – j + 2k 
a.b = 2-1+2 = 3 
|a| = sqrt (6) 
|b| = sqrt(6) 
3 = 6 cosQ 
Q = 60 degree 
 
 

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