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Babynini

  • one year ago

Airplanes and vertex

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  1. Babynini
    • one year ago
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  2. Babynini
    • one year ago
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    @perl

  3. Babynini
    • one year ago
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    @freckles

  4. Babynini
    • one year ago
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    @gaos :)

  5. ganeshie8
    • one year ago
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    velocity of jet is 775 mi/h in NE direction : |dw:1433303568557:dw|

  6. ganeshie8
    • one year ago
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    can you split it as horizontal and vertical components ?

  7. Babynini
    • one year ago
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    em nah i'm not sure.

  8. Babynini
    • one year ago
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    you mean like make it into triangles?

  9. ganeshie8
    • one year ago
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    Yes solve these two sides in the right triangle |dw:1433304188744:dw|

  10. Babynini
    • one year ago
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    the side along j is 548.007 ...right?

  11. Babynini
    • one year ago
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    no, sorry. the side from the j line to the plane

  12. ganeshie8
    • one year ago
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    548 is right

  13. Babynini
    • one year ago
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    oh haha good!

  14. ganeshie8
    • one year ago
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    |dw:1433304779704:dw|

  15. ganeshie8
    • one year ago
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    so for part \(b\), the velocity of jet in component form is \[\large 548i + 548j\]

  16. Babynini
    • one year ago
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    ok!

  17. Babynini
    • one year ago
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    can we do the same for the wind and get 27.5? or does that not work?

  18. ganeshie8
    • one year ago
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    you need to work horizontal and vertical components in this triangle |dw:1433306300948:dw|

  19. ganeshie8
    • one year ago
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    horozontal = 55*sin(30) = ? vertical = 55*cos(30) = ?

  20. Babynini
    • one year ago
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    27.5 47.63

  21. Babynini
    • one year ago
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    (horizontal first, vertical second)

  22. Babynini
    • one year ago
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    is the direction of the jet (the last box) = 58.64?

  23. Babynini
    • one year ago
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    (sorry, tht's a completely different part. we can come back to that.)

  24. ganeshie8
    • one year ago
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    good so for part \(a\) do we have \[\large 27.5i + 47.63j\] ?

  25. Babynini
    • one year ago
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    Yup

  26. ganeshie8
    • one year ago
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    For part \(c\), simply add the answers from part \(a\) and \(b\)

  27. ganeshie8
    • one year ago
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    hey may be use 548.0077i + 548.0077j for part a because they are asking to round to two decimal places

  28. ganeshie8
    • one year ago
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    part \(c\) : true velocity of plane = velocity of plane + velocity of wind = \(\large (548.007i+548.007j) + (27.5i+47.63j)\) = ?

  29. Babynini
    • one year ago
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    575.51i +595.62j

  30. ganeshie8
    • one year ago
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    you should be getting 575.51i +595.6\(\color{red}{4}\)j check once

  31. Babynini
    • one year ago
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    hm ok. Maybe i rounded the numbers wrong. I tried to use the original numbers.

  32. ganeshie8
    • one year ago
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    ok part \(d\) should be simple take the magnitude of true velocity vector from part \(c\)

  33. ganeshie8
    • one year ago
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    speed = \(\|575.51i+595.64j\| = \sqrt{575.51^2+595.64^2}=?\)

  34. Babynini
    • one year ago
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    828.25

  35. ganeshie8
    • one year ago
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    knw how to work last part ?

  36. Babynini
    • one year ago
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    uh well I think so but i've been getting lots wrong lately lol

  37. ganeshie8
    • one year ago
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    for last part, just need to find the angle of true velocity vector from part \(c\)

  38. Babynini
    • one year ago
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    equation for that would be?

  39. ganeshie8
    • one year ago
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    For any vector \(x+iy\), angle with positive x axis is given by \(\tan^{-1}(y/x)\)

  40. Babynini
    • one year ago
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    so we'd do tan^(-1) 595.64/575.51

  41. ganeshie8
    • one year ago
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    yes use ur calculator

  42. Babynini
    • one year ago
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    45.98

  43. Babynini
    • one year ago
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    oh but rounded to nearest interger so 46?

  44. ganeshie8
    • one year ago
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    yes but thats the angle from positive x axis : |dw:1433308877835:dw|

  45. ganeshie8
    • one year ago
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    the question is asking you for the angle from positive "y" axis

  46. ganeshie8
    • one year ago
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    |dw:1433308980730:dw|

  47. Babynini
    • one year ago
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    44

  48. ganeshie8
    • one year ago
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    Perfect!

  49. Babynini
    • one year ago
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    haha yay! :)

  50. Babynini
    • one year ago
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  51. Babynini
    • one year ago
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    Did i put them in wrong? o.o because the answers based off of those are correct.

  52. ganeshie8
    • one year ago
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    how many chances do u have ?

  53. Babynini
    • one year ago
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    5!

  54. ganeshie8
    • one year ago
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    5 or 5!=120

  55. ganeshie8
    • one year ago
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    try putting exact form

  56. Babynini
    • one year ago
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    oh gosh no lol just 5.

  57. ganeshie8
    • one year ago
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    part \(a\) : \[\large 27.5i+27.5\sqrt{~3~} j\]

  58. ganeshie8
    • one year ago
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    part \(b\) : \[\large 387.5\sqrt{2}i+387.5\sqrt{2}j\]

  59. Babynini
    • one year ago
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    Yeah the example one they did looks sort of like that. just divided b by the sq2

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  60. ganeshie8
    • one year ago
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    good, give it a try you have 3 more chances right

  61. Babynini
    • one year ago
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    so should I do it exactly like them and try to put little arrows over stuff?

  62. ganeshie8
    • one year ago
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    do u knw how to put arrows ?

  63. ganeshie8
    • one year ago
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    maybe forget about arrows for now and try entering the exact values wid radicals if it doesn't work, then you may try with arrows

  64. ganeshie8
    • one year ago
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    because part c worked even when you didn't put arrows

  65. Babynini
    • one year ago
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    not dividing it by sq2 either?

  66. ganeshie8
    • one year ago
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    enter these and let me know if they work http://gyazo.com/81f10a84809d5f9dc852b18b923080a3

  67. Babynini
    • one year ago
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    Yep that did it :)

  68. ganeshie8
    • one year ago
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    Awesome!

  69. Babynini
    • one year ago
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    Many thanks ^-^

  70. ganeshie8
    • one year ago
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    np

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