# Quick Answer: What Is The Dot Product Of Parallel Vectors?

## What is the dot product of the unit vector i and i?

The dot product between a unit vector and itself is also simple to compute.

Given that the vectors are all of length one, the dot products are i⋅i=j⋅j=k⋅k=1..

## What is the dot product of three vectors?

The scalar triple product of three vectors a, b, and c is (a×b)⋅c. It is a scalar product because, just like the dot product, it evaluates to a single number. (In this way, it is unlike the cross product, which is a vector.)

## What is the formula of dot product?

The Dot Product is written using a central dot: a · b. This means the Dot Product of a and b. We can calculate the Dot Product of two vectors this way: a · b = |a| × |b| × cos(θ)

## How do you know if 2 vectors are parallel?

Two vectors A and B are parallel if and only if they are scalar multiples of one another. A = k B , k is a constant not equal to zero. Two vectors A and B are perpendicular if and only if their scalar product is equal to zero.

## What does scalar mean?

Scalar, a physical quantity that is completely described by its magnitude; examples of scalars are volume, density, speed, energy, mass, and time. Other quantities, such as force and velocity, have both magnitude and direction and are called vectors.

## Do parallel vectors have the same direction?

Two vectors are parallel if they have the same direction or are in exactly opposite directions. … When we performed scalar multiplication we generated new vectors that were parallel to the original vectors (and each other for that matter).

## What is the dot product of i and j?

In words, the dot product of i, j or k with itself is always 1, and the dot products of i, j and k with each other are always 0. The dot product of a vector with itself is a sum of squares: in 2-space, if u = [u1, u2] then u•u = u12 + u22, in 3-space, if u = [u1, u2, u3] then u•u = u12 + u22 + u32.

## What is the physical meaning of dot product?

In mathematics, the dot product or scalar product is an algebraic operation that takes two equal-length sequences of numbers (usually coordinate vectors) and returns a single number. … Geometrically, it is the product of the Euclidean magnitudes of the two vectors and the cosine of the angle between them.

## What is the application of dot product?

Applications include finding projection of a force onto a specified axis. Checking whether 2 vectors are perpendicular. Finding work done by a force. Multiplication of matrices in linear algebra involve taking dot product of the row in left matrix with column in right matrix.

## What is the dot product of two vectors used for?

An important use of the dot product is to test whether or not two vectors are orthogonal. Two vectors are orthogonal if the angle between them is 90 degrees. Thus, using (**) we see that the dot product of two orthogonal vectors is zero.

## What type of quantity is produced by the dot product of two vectors?

Dot product – also known as the “scalar product”, an operation that takes two vectors and returns a scalar quantity. The dot product of two vectors can be defined as the product of the magnitudes of the two vectors and the cosine of the angle between the two vectors.

## What happens when two vectors are perpendicular?

Two vectors are perpendicular when their dot product equals to .