Question

calculate the value ofbeta in the unit vector 0.8i-0.4j​

Answer 1

Explanation:

Given that the vector 0.4

i

^

+0.8

j

^

+λ

k

^

is unit vector, hence it magnitude will be 1.

1=

0.4

2

+0.8

2

+λ

2

λ=0.10

Answer 2

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0.8i+0.4j-bk=1

Magnitude of vector,

Under root(0.8i+0.4j-bk)#magnitude

0.64+0.16+b*b=1

b*b=1-0.80

b*b=0.20

b=2(root 5)/10

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