Question

(a) For what values of the angle ‘θ’ between two vectors their scalar product is positive? (b) For what values of the angle ‘θ’ between two vectors their scalar product is negative​

Answer 1

Explanation:

• scalar product is defined by a. b = a b cos x
• for cos x to be positive X should lie in 1st and 4th quadrent or x lies between 0 to 90 or 270 to 360
• for cos x to be negative x should lie between 90 to 270