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Homework Help: Can someone help me with this

  1. Feb 3, 2004 #1
    Can someone help me with this....

    1.) Displacement vector A points due east and has a magnitude of 3.07 km. Displacement vector B points due north and has a magnitude of 7.56 km. Displacement vector C points due west and has a magnitude of 9.67 km. Displacement vector D points due south and has a magnitude of 4.4 km. Find (a) the magnitude of the resultant vector A + B + C + D and (b) its angle relative to due west.

    2.) The speed of an object and the direction in which it moves constitute a vector quantity known as the velocity. An ostrich is running at a speed of 14.8 m/s in a direction of 63 degrees north of west. What is the magnitude of the ostrich's velocity component that is directed (a) due north and (b) due west?

    3.)Soccer player #1 is 9 m from the goal, as the figure shows. If she kicks the ball directly into the net, the ball has a displacement labeled A. If, on the other hand, she first kicks it to player #2, who then kicks it into the net, the ball undergoes two successive displacements, Ay and Ax. What are the magnitudes of (a) Ax, and (b) Ay. here is the pic for it...
    http://publish.hometown.aol.co.uk/hmlisa1/images/untitled.jpg [Broken]

    4.) You are on a treasure hunt and your map says "Walk due west for 14.9 paces, then walk 20 degrees north of west for 80.9 paces, and finally walk due north for 76.4 paces." What is the magnitude of the component of your displacement in the direction (a) due north and (b) due west?

    Please help me with those 4 questions...it's due tomorrow and i h ave no idea what to di..i'ts my first time taking physics and my prof didn't teach us how to do it yet...i really appreciate it..thanks alot guys
    Last edited by a moderator: May 1, 2017
  2. jcsd
  3. Feb 4, 2004 #2


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    Staff Emeritus
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    Gold Member

    These problems are simple applications of Trig. Draw the vector on a coordinate system, draw triangles showing the decomposition of the vector on the coordinate system. Use trig to find the components.
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