# What is the dot product of 5i and 8j?

##### 1 Answer

Dec 13, 2016

#### Explanation:

A property of the scaler (or dot) product is that it is zero if the vectors are perpendicular which

We can show this if required:

Let

and

The scaler product is:

# vec u * vec v = ((5),(0)) * ((0),(8))#

# \ \ \ \ \ \ \ \ \ \ = (5)(0) + (0)(8)#

# \ \ \ \ \ \ \ \ \ \ = 0+0#

# \ \ \ \ \ \ \ \ \ \ = 0#