   Chapter 12.3, Problem 9E

Chapter
Section
Textbook Problem

# Find a · b.9. | a | = 7, | b | = 4, the angle between a and b is 30°

To determine

To find: A dot product between a and b .

Explanation

Given:

|a|=7 , |b|=4 and θ=30° .

Formula:

Write the expression to find ab in terms of θ .

ab=|a||b|cosθ (1)

Here,

|a| is the magnitude of vector a,

|b| is the magnitude of vector b, and

θ is the angle between vectors a and b

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