Calculus 3 : Angle between Vectors

Study concepts, example questions & explanations for Calculus 3

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Example Questions

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Example Question #66 : Calculus 3

Find the angle between the two vectors. Round to the nearest degree.

Possible Answers:

Correct answer:

Explanation:

In order to find the angle between the two vectors, we follow the formula

and solve for  

Using the vectors in the problem, we get

Simplifying we get

To solve for 

we find the 

of both sides and get

and find that

Example Question #67 : Calculus 3

Find the angle between the two vectors. Round to the nearest degree.

Possible Answers:

Correct answer:

Explanation:

In order to find the angle between the two vectors, we follow the formula

and solve for  

Using the vectors in the problem, we get

Simplifying we get

To solve for 

we find the 

of both sides and get

and find that

Example Question #68 : Calculus 3

Find the angle between the two vectors. Round to the nearest degree.

Possible Answers:

Correct answer:

Explanation:

In order to find the angle between the two vectors, we follow the formula

and solve for  

Using the vectors in the problem, we get

Simplifying we get

To solve for 

we find the 

of both sides and get

and find that

Example Question #69 : Calculus 3

Calculate the angle between the vectors  and , and express the measurement of the angle in degrees.

Possible Answers:

Correct answer:

Explanation:

The angle  between the vectors  and  is given by the following equation:

where  represents the cross product of the vectors  and , and  and  represent the respective magnitudes of the vectors  and .

We are given the vectors  and . Calculate , and , and then substitute these results into the formula for the angle between these vectors, as shown:

,

,

and

.

Hence,

The principal angle  for which  is . Hence, the angle between the vectors  and  measures .

Example Question #70 : Calculus 3

Find the angle between the gradient vector  and the vector  where  is defined as: 

 

 

 

Possible Answers:

Correct answer:

Explanation:

Find the angle between the gradient vector  and the vector  where  is defined as: 

 

_____________________________________________________________ 

Compute the gradient by taking the partial derivative for each direction: 

At  we have: 

 ____________________________________________________________

The angle  between two vectors  and  can be found using the dot product: 

We wish to find the angle  between the two vectors: 

 

Compute the dot product between  and  

Therefore the dot product is: 

 

Compute the magnitude of  

 

 

 

 

Compute the magnitude of  

 

Now put it all together:  

 

 

 

 

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