Question

Find the scalar products of two vectors 5i and 8j​

Answer 1

Answer:

The scalar product of a and b is: a · b = |a||b| cosθ We can remember this formula as: “The modulus of the first vector, multiplied by the modulus of the second vector, multiplied by the cosine of the angle between them.” Clearly b · a = |b||a| cosθ and so a · b = b · a