" 1.Define unit vectors."

What is a null vector? Define a unit vector.

Define the Vector

Define vectors.

Define unit vector, null vector and position vector .

Define unit vector, null vector and posi-tion vector .

Define (i) unit vector (ii) null vector (iii) cross product of two vectors vec A and vec B .

Define unit vector vec A and vec B are two vectors and theta is the angle between them. If |vecA xx vecB | = sqrt3(vecA.vecB) , Calculate the value of theta .