Question

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

Answer 1

Explanation:

0.4 i + 0.8 j +bk

it is unit vector so magnitude will be 1

0.4^2 +0.8^2 +b^2 = 1^2

0.16 + 0.64 +b^2 = 1

0.8 +b^2 = 1

b^2 = 0.2

b= 0.4472

Hope it helps uh!!