Question

22. Which of the following is not a unit
vector?
(1 Point)
o all of these
(1/12)i + (1/12);
(1/13) i + (1/13)j + (1/1
O cos 0i + sin Oj
23. The minimum number of vectors havin
unequal magnitude whose vector sum car
be a null vector are:​

Answer 1

Answer:

A unit vector, is a vector whose modulus is 1.

Out of the following, only option C is not a unit vector.

Let

a

=sin2θ

i

^

−cosθ

j

^

∣

a

∣

2

=sin

2

2θ+cos

2

θ

=4sin

2

θcos

2

θ+cos

2

θ

=cos

2

θ(4sin

2

θ+1)



=1 for all values of θ.

Hence it is not a unit vector.