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Help (: adding vectors! components... angles, drawing.

  • #1
britt6

Homework Statement


A ship travelling 55 degrees [W of N] is 65km farther north after 3.0h. What is the ship's velocity.

Homework Equations


sin, cos, tan?

The Attempt at a Solution


I know that Vground= Vair + Vwind, and that Vground = Vboat + Vcurrent, but i'm not sure if that is even relevant to the question... So far I have drawn out :

Do I add these vectors together or subtract? and am I trying to find the boat's velocity or ground velocity. I think boat velocity but what does that make of the 55 degrees W of N... I am so lost please help (:

Screen Shot 2017-07-09 at 7.48.31 PM.png
 
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Answers and Replies

  • #2
I have no idea help please!
You need to show some attempt at a solution first before others will try to help you.
Try drawing out the problem at least.
 
  • #3
britt6
You need to show some attempt at a solution first before others will try to help you.
Try drawing out the problem at least.
Ok! ive never used this before lol so I don't know what I'm doing. But thanks, I will do that.
 
  • #4
gneill
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Your image link appears to be addressing a target that is not publicly accessible. I suggest that you UPLOAD the image file to the PF server so that it's made available t our homework helpers (use the UPLOAD button).
 
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  • #5
britt6
Your image link appears to be addressing a target that is not publicly accessible. I suggest that you UPLOAD the image file to the PF server so that it's made available t our homework helpers (use the UPLOAD button).
Thank you!!!
 
  • #6
gneill
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20,797
2,777
On your image you've labelled the distances x and y. y is the distance that the boat traveled in the northward direction, and presumably x is distance it traveled in the westward direction. Can you determine the total distance it traveled along its trajectory? (hint: what's the length of the hypotenuse of that triangle?)
 
  • #7
britt6
On your image you've labelled the distances x and y. y is the distance that the boat traveled in the northward direction, and presumably x is distance it traveled in the westward direction. Can you determine the total distance it traveled along its trajectory? (hint: what's the length of the hypotenuse of that triangle?)
Now im not sure... Do I use v=d/t. The answer in the book says its 38km/h but that doesn't seem to match up with my numbers.
 

Attachments

  • #8
gneill
Mentor
20,797
2,777
Your evaluation of c doesn't look right. Please show your calculation in detail. What is a? What is b?
 
  • #9
britt6
Oops I see where I made a mistake.. instead of putting a as 65 squared, I put 95 squared. Just a calculation error! Thanks for your help, I've figured out the question now (:
 

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