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## Homework Statement

Vector a =8

vector b=15

the solution is 9 and theta is 34 degrees

I want to know how did they come up with that solution.

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- Thread starter realism877
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- #1

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Vector a =8

vector b=15

the solution is 9 and theta is 34 degrees

I want to know how did they come up with that solution.

- #2

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A vector has a magnitude and a direction. What you posted for a and b has the magnitude part down, but is missing direction.

Is this all you were given?

(this will likely be moved -- but I'm not an admin so oh well for now)

- #3

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A vector has a magnitude and a direction. What you posted for a and b has the magnitude part down, but is missing direction.

Is this all you were given?

(this will likely be moved -- but I'm not an admin so oh well for now)

Here is the image of the solution

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- #4

gb7nash

Homework Helper

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Vector a =8

vector b=15

Are you sure you wrote this correctly? Is this magnitude? The actual vector? Euclidean vectors have a magnitude and a direction. I guess you could have vectors in R

However, the presence of an angle and an incorrect magnitude suggest to me that this is not the case. You need to elaborate.

- #5

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We have to find the magnitude and direction of the sum of vector A and B.

- #6

gb7nash

Homework Helper

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Ok, so how do you typically add vectors together?

- #7

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Yes

And get the angle

And get the angle

- #8

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Do I use the law of sines or just the pythogrean theorem?

- #9

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I know how to get 9 as the solution. HOwever, I don't know how they got 34 degrees as a solution.

- #10

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As gb7nash asked, how have you been shown, in your class, to add vectors?

- #11

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I got how to add them, but how do I find the difference?

I need help finding the angles. How do I do that?

I know I have to put b in the negative direction. Which I did, but what is its angle? What is the angle of a?

I need help finding the angles. How do I do that?

I know I have to put b in the negative direction. Which I did, but what is its angle? What is the angle of a?

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- #12

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tanθ = (y component of vector) divided by (x component of vector)I got how to add them, but how do I find the difference?

I need help finding the angles. How do I do that?

The angle ofI know I have to put b in the negative direction. Which I did, but what is its angle? What is the angle of a?

From the figure you posted earlier,

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