Question

what is the angle between I+j+k and with positive x-axis​

Answer 1

Answer:

⇒ The angle between the vector i^+j^+k^ and the X axis is the same as the angle between the vector i^+j^+k^ and the vector i^.

Let the angle between these two vectors by θ.

Taking the dot product of these two vectors, we get,

(i^+j^+k^)⋅i^=|i^+j^+k^||i^|cosθ.

⇒1=3–√⋅1⋅cosθ⇒cosθ=13√.

⇒θ=arccos(13√).

⇒ The angle between the vector i^+j^+k^ and the X axis is arccos(13√).

Explanation:

Answer 2

Explanation:

The resultant of two forces 10 N and 15 N acting along +x and -x axes respectively ,is *