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Find the magnitude of resultant of OA, OB and OC.

  1. Jun 17, 2011 #1
    1. Find the magnitude of resultant of OA, OB and OC ( there is an arrow sign upwards of OA, OB and OC showing these are vectors.)


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    (Sorry but i am not good at making computer drawings.)


    3. The attempt at a solution

    I tried to find the resultant of OA and OC and then the angle of resultant with OA but the whole thing turned out to be a mess. please help me in it.....
     
  2. jcsd
  3. Jun 17, 2011 #2

    Redbelly98

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    Please show what you tried, then we can help figure out how it is wrong.
     
  4. Jun 17, 2011 #3
    i have cut that solution by pen..should i scan that and upload it?is that ok??
     
  5. Jun 22, 2011 #4
    plz someone reply it...there is no need to scan and upload my solution as i know that whatver i have done is totally wrong as the angle b/w resultant of OA and OB was in points( i had to calculate it via calculator)...plz some one reply me....You might consider me fool bocz i am telling my attempt wrong bcoz of only the angle was in points.I knw it was wrong bcoz in the book, there is no question who has angle in points..So i think my attempt is incorrect.......
    plz some one reply me.......
     
  6. Jun 22, 2011 #5
    Vector A: ri
    Vector B: rcos45i +rsin45j
    Vector C: rj

    Add vectors together. Redraw. Use trig to find magnitude and direction of resultant vector
     
  7. Jun 22, 2011 #6

    Redbelly98

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    Sorry for not responding sooner, devvaibhav. As RTW69 suggested, you can write each vector in terms of its x and y (or "i" and "j") components. Add like components together.
     
  8. Jun 23, 2011 #7
    @RTW69 tnx....it was hell simple..i was confused..tnx for it...
    @Redbelly98 its ok.....

    thanks everyone...........
     
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