Physics Help Forum Vector Word Problem

 Kinematics and Dynamics Kinematics and Dynamics Physics Help Forum

 Jan 26th 2009, 08:22 AM #1 Junior Member   Join Date: Sep 2008 Posts: 6 Vector Word Problem I am having trouble with a mastering physics problem. I am told A spelunker is surveying a cave. She follows a passage 130m straight west, then 290m in a direction 45east of south, and then 280m at 30 east of north. After a fourth unmeasured displacement, she finds herself back where she started.Use a scale drawing to determine the magnitude of the fourth displacement. I tried breaking each vector down into components and doing the math but I did not get the right answer. I also tried using a scale drawing also but I could not get it that way. I am asking for help because I only have two more attempts at the problem before I get no credit for it. If anyone can help me out I would greatly appriciate it.
 Jan 26th 2009, 08:26 AM #2 Senior Member   Join Date: Dec 2008 Location: Las Cruces NM Posts: 256 Could you show the breakdown into to components that you used?
 Jan 26th 2009, 08:31 AM #3 Junior Member   Join Date: Sep 2008 Posts: 6 Ok For vector 1 130m for x component 0m for y component vector 2 205.06 for x component -205.06 for y component vector 3 140 for x component 242.48 for y component when i sum all these vectors up I get 475.06 for x component 37.42 for y component
 Jan 26th 2009, 08:44 AM #4 Junior Member   Join Date: Sep 2008 Posts: 6 I found my problem. My first x component of the vector should of been negative instead of positive
 Jan 26th 2009, 08:45 AM #5 Senior Member   Join Date: Dec 2008 Location: Las Cruces NM Posts: 256 I think the x component of the first vector is -130 instead of +130. (I assume that you know that the answer isn't the sum of the vectors, it is what vector will cancel out that sum. So it is (-1) times the sums.) Were you supposed to give the answer in terms of a magnitude and direction?

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