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TrojanPoem

  • one year ago

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  1. TrojanPoem
    • one year ago
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    |dw:1444135482286:dw| if F = 60 n, U = 300 n, theta = 40

  2. TrojanPoem
    • one year ago
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    V = 112.7 / 145.9 / 154.3 / 257.9 alpha = 131.4 / 98.6 / 41.4 / 115.2

  3. dan815
    • one year ago
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    n?

  4. TrojanPoem
    • one year ago
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    Newton

  5. dan815
    • one year ago
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    whats with all the V and alpha

  6. TrojanPoem
    • one year ago
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    F is the resultat of both V, u

  7. phi
    • one year ago
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    I assume you are adding the vectors u and f, and the resultant is v ?

  8. dan815
    • one year ago
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    |dw:1444135771546:dw|

  9. dan815
    • one year ago
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    arrows here?

  10. TrojanPoem
    • one year ago
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    The action direction

  11. TrojanPoem
    • one year ago
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    Right.

  12. dan815
    • one year ago
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    =.=

  13. phi
    • one year ago
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    ok u + V= F |dw:1444135779512:dw|

  14. phi
    • one year ago
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    you could use Law of Cosines to find |V| and Law of Sines to find the supplementary angle

  15. TrojanPoem
    • one year ago
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    I tried 60 / Sin ( alpha + 40 ) = 300/ sin alpha = v / sin40 I ended up with tan alpha = -1.1

  16. phi
    • one year ago
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    law of cos gives 256.9 for | v|

  17. dan815
    • one year ago
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    |dw:1444136003702:dw|

  18. TrojanPoem
    • one year ago
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    Oh, you used the force triangle for the cosine rule, I used Resultant = v^2 + u ^2 + 2 vu cos apha + theta

  19. dan815
    • one year ago
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    or just do vector addition since u are learning vectors

  20. TrojanPoem
    • one year ago
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    |dw:1444136349451:dw| Where is f ?

  21. TrojanPoem
    • one year ago
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    @phi, your method works , I will continue and see thanks.

  22. dan815
    • one year ago
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    u=<300,0> f=<60 cos(40),60 sin (40) v=<x,y> u+v=f 300+x= 60 cos(40) 0+y=60sin(40)

  23. phi
    • one year ago
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    alpha, by law of sins is 131.4 |dw:1444136394450:dw|

  24. TrojanPoem
    • one year ago
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    @dan815 , Never thought I could use vectors like this nice nice

  25. dan815
    • one year ago
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    ya vectors make it neat ^^

  26. TrojanPoem
    • one year ago
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    Thanks @phi, @dan815

  27. TrojanPoem
    • one year ago
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    medal to who ?

  28. phi
    • one year ago
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    you can also you components. u+v= f so v= f-u f=<300,0> (we let f point along the x-axis u= 60<cos 40, -sin 40> v= <60 cos(40) - 300, -60 sin(40) > now find the magnitude and angle of v |v| = 256.9 angle = atan(y/x) = 8.6 deg in the 3rd quadrant= 171.4 alpha = 171.4-40= 131.4 deg

  29. dan815
    • one year ago
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    lol

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