Question

Given that
0.4i+0.8j+bk is unit vector.what is the value of b

Answer 1

Explanation:

0.4 i +0.8j +bk

it is unit vector so magnitude will be 1

√0.4^2 +0.8^2 +b^2 = 1

0.8 +b^2 = 1

b^2 = 0.2

b = 0.4472