Find C vector, with two known magnitudes

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Homework Help Overview

The discussion revolves around finding a vector C given two known magnitudes and involves the law of cosines. The original poster expresses difficulty in approaching the problem, indicating a lack of prior exposure to the relevant physics concepts.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants discuss the use of the law of cosines and the tail-to-tip method. Questions are raised about the specific calculations needed, including the use of square roots and trigonometric functions to find angles.

Discussion Status

Some participants have provided guidance on the methods that could be used, while others are exploring different interpretations of the problem. There is an acknowledgment of the original poster's confusion, and attempts to clarify the steps involved are ongoing.

Contextual Notes

The original poster has not provided a visual representation of their work, which may limit the clarity of the discussion. There is also an indication that the topic may not have been covered in class yet.

Casodd
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Homework Statement


https://i.imgur.com/UtLzb34.png

Homework Equations


the law of cosinus

The Attempt at a Solution


I have not been available to scan my work, but I'm kinda stuck at the beginning. And our teacher have not show us this kind of physics yet.
Thanks.
 
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Welcome to PF, what method have you already tried? I'm assuming you are using the tail-to-tip method since the law of cosines relevant. What exactly are you having trouble with?

Edit: I would appreciate even just a photo of your work (make sure its neat and legible).
 
So all I have to do is take the square root of ( |A|^2+ |B|^2cos79 ) ?
and then do tan delta to find the degree? (Which is not the question) ?
picture:
Q87BV0L.png


Thanks for answering.
 

Attachments

  • Q87BV0L.png
    Q87BV0L.png
    8.7 KB · Views: 869
Casodd said:
So all I have to do is take the square root of ( |A|^2+ |B|^2cos79 ) ?
and then do tan delta to find the degree? (Which is not the question) ?
picture:
View attachment 218369

Thanks for answering.
Yes, this looks accurate. That's how I did it. Good job!
 

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