Question

find the unit vectors of5i+7j+k

Answer 1

n cap=A vector÷(modulus of A vector)
A=
$\sqrt{5 { }^{2} + 7 {}^{2} + { 1 }^{2} }$
=
$\sqrt{25 + 49 + 1}$
=
$\sqrt{75 }$
A =
$\sqrt{75}$
unit vectot(n cap)=(5i+7j+k)÷(sqrt of 75)