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If 0.4i+0.7j+ak is a unit vector then value of a is...

If 0.4i+0.7j+ak is a unit vector then value of a is...

Grade:11

1 Answers

Debolina Sarkar
29 Points
6 years ago
Let the vector equation isp=0.4i+0.7j+akAccording to the question the p vector is an unit vector so|p|=|0.4i+0.7j+ak|=1Therefore,√{(0.4)^2+(0.7)^2+a^2}=1or,√(0.16+0.49+a^2)=1or,0.65+a^2=1or,a=√0.35

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