Trigonometry with Vectors

  • Thread starter C42711
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  • #1
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[PLAIN]http://img832.imageshack.us/img832/449/physicsu.png [Broken]
By c42711 at 2011-10-30

I am supposed to find the X and Y components of the above vector. What I tried to do first was dot in a line, forming a triangle. I then tried to find the length of that line using tangent. I got 431.8, but I am not sure that is right. Next, I used the Pythagorean theorem to try to find the X and Y components, I got some crazy numbers, so I know I'm doing something wrong. Any help would be fantastic. Please & thank you.:)
 
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Answers and Replies

  • #2
47
0
Tangent is not the correct function to use. 147km is the hypotenuse of the triangle.
 
  • #3
86
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You'd need to use sine for the vertical and cosine for the horizontal. The sine of the angle is y / the hypotenuse, so y = sin71.2 * h. Similarly, x = cos71.2 * h. Hope that helps.
 
  • #4
22
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So I tried that and got:
Fx= 47.4 km
Fy= 139 km

Does that seem correct?
 
  • #5
47
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Yeah, those are the correct values.
 
  • #6
22
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Than you so much, you're the best.:)
 

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