Chapter 9: Q. 50 (page 631)

In Problems 50–52, determine whether v and w are parallel, orthogonal, or neither.
$v = 2 i + 3 j; w = - 4 i - 6 j$

Short Answer

Expert verified

The given vectors are parallel but not orthogonal.

Step by step solution

Step 1. Given Information

The given vectors are $v = 2 i + 3 j a n d w = - 4 i - 6 j .$

Step 2. Determining whether v and w are parallel or not

To determine whether the two vectors are parallel or not, we have to find the angle between them because two vectors v and w are said to be parallel if the angle between them is $0 or π .$

So,

$\cos θ = \frac{v \cdot w}{||v|| ||w||} \cos θ = \frac{(2 i + 3 j) \cdot (- 4 i - 6 j)}{(\sqrt{2^{2} + 3^{2}}) (\sqrt{{(- 4)}^{2} + {(- 6)}^{2}})} \cos θ = \frac{- 26}{26} θ = \cos^{- 1} (- 1) θ = π$

Thus,vand ware parallel.

Step 3. Determining whether v and w are orthogonal or not

Two vectors v and w are said to be orthogonal if and only if $v \cdot w = 0 .$

So,

$v \cdot w = (2 i + 3 j) \cdot (- 4 i - 6 j) v \cdot w = - 8 - 18 v \cdot w = - 26$

Thus, the vectors are not orthogonal.

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In Problems 50–52, determine whether v and w are parallel, orthogonal, or neither.
$v = 2 i + 3 j; w = - 4 i - 6 j$

Short Answer

Step by step solution

Step 1. Given Information

Step 2. Determining whether v and w are parallel or not

Step 3. Determining whether v and w are orthogonal or not

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In Problems 50–52, determine whether v and w are parallel, orthogonal, or neither.v=2i+3j;w=-4i-6j

Short Answer

Step by step solution

Step 1. Given Information

Step 2. Determining whether v and w are parallel or not

Step 3. Determining whether v and w are orthogonal or not

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Math Textbooks

Logic and Functions

Theoretical and Mathematical Physics

Calculus

Discrete Mathematics

Statistics

Applied Mathematics

Study anywhere. Anytime. Across all devices.

In Problems 50–52, determine whether v and w are parallel, orthogonal, or neither.
$v = 2 i + 3 j; w = - 4 i - 6 j$