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YumYum247

  • one year ago

someone help me!!! :)

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  1. YumYum247
    • one year ago
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    @IrishBoy123 Please help!!! :)

  2. YumYum247
    • one year ago
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    |dw:1441322544931:dw|

  3. YumYum247
    • one year ago
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    But how do i find the angle?????

  4. YumYum247
    • one year ago
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    @welshfella can you help me?!?!?!? O_o

  5. YumYum247
    • one year ago
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    |dw:1441323071374:dw|

  6. IrishBoy123
    • one year ago
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    lotta drawings here, all look different. is there a scan or link to question?

  7. YumYum247
    • one year ago
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    ok please wait....:)

  8. IrishBoy123
    • one year ago
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    why do you think the asnwer is 25N ???

  9. YumYum247
    • one year ago
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    it looks pretty obvious.....doesn't it....do you want me to show you how i got it???

  10. IrishBoy123
    • one year ago
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    yes pls show!

  11. IrishBoy123
    • one year ago
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    question 10N down 8N up how is that 18N down shouldn't it be 2N down?!

  12. YumYum247
    • one year ago
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    try to find the hypotenuse like that....

  13. IrishBoy123
    • one year ago
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    forget about hypoteneuses for the minute do you have a book answer if it is 18N down the answer is 32.33N if it is 2N as it should be the answer still isn't 25N do you know the law of cosines??? cos that makes this really easy

  14. YumYum247
    • one year ago
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    why your using cosine here doe????

  15. IrishBoy123
    • one year ago
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    "law of cosines" ring a bell ?!?!

  16. YumYum247
    • one year ago
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    yes but first tell me what does the hexagon means on the diagram????

  17. IrishBoy123
    • one year ago
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    isn't that the shape of the body? i have never seen it before! i am about to post a few drawings. bear with me

  18. IrishBoy123
    • one year ago
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    |dw:1441324012164:dw|

  19. YumYum247
    • one year ago
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    |dw:1441323811136:dw|

  20. IrishBoy123
    • one year ago
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    |dw:1441324028314:dw|

  21. IrishBoy123
    • one year ago
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    if the diagram is right, this is how you do it you must resolve the 17N force in the x and y directions

  22. YumYum247
    • one year ago
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    is it ....C^2 = A^2 + B^2-2abCos45???

  23. IrishBoy123
    • one year ago
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    yeah! do you actually know that law?!?! cos it makes life really easy this easy http://www.wolframalpha.com/input/?i=%2817%5E2+%2B+2%5E2+-+2%2817%29%282%29cos+135%29%5E%281%2F2%29

  24. YumYum247
    • one year ago
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    yah....well kinda...ok but please tell me under what scenario do i use the sin law in questions such as these......or do we ever use the sin law in these type of questions?

  25. YumYum247
    • one year ago
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    because i haven't done a single question that uses sin law instead of cos.

  26. IrishBoy123
    • one year ago
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    you need to know more angles to use the law of sines, though it is a much easier rule to apply look at this https://gyazo.com/75c2ae6ed28fa5e3109a4e87a4775967

  27. YumYum247
    • one year ago
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    ok Thanks hun.....just one last thing.....to find the angle, we use sinA/a + SinB/b = SinC/c right???????????/

  28. YumYum247
    • one year ago
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    i meant sinA/a = SinB/b = SinC/c

  29. IrishBoy123
    • one year ago
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    yes, that is the law of sines but the question does not want the direction of the force, just its magnitude

  30. IrishBoy123
    • one year ago
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    i think we shoukd just resolve the 17N force in the x and y direction as i suggested.

  31. YumYum247
    • one year ago
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    yah but for some reason, the examples that i have also include the angle.....so my final answer would be like....suppose 50N (E70S)

  32. YumYum247
    • one year ago
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    but i think in our case the angle would be 45degree right??????

  33. IrishBoy123
    • one year ago
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    we can do the angle but using simple trig id's did you follow the drawing hwere the 17N is resolved in x and y directions, cos that is a few steps off getting us done.

  34. IrishBoy123
    • one year ago
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    the final angle will not be 45deg

  35. IrishBoy123
    • one year ago
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    |dw:1441324840879:dw|

  36. YumYum247
    • one year ago
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    oh you sohcahtoa..

  37. IrishBoy123
    • one year ago
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    now you can use pythagoreas etc

  38. YumYum247
    • one year ago
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    ok so now i can apply the pythangorem theorem right....

  39. YumYum247
    • one year ago
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    ok Thanks alot... :)

  40. IrishBoy123
    • one year ago
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    forgive me for the impertenance (!!!) but did you follow the resolving of the 17N

  41. IrishBoy123
    • one year ago
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    17 cos 45 up, 17sin45 to the left

  42. IrishBoy123
    • one year ago
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    cool!

  43. YumYum247
    • one year ago
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    hey sorry, i went to take a d....p but yah so 17sin 45 will give me the angle on x-axis and 17cos45 will give me the angle on the y-axis????

  44. YumYum247
    • one year ago
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    |dw:1441325684118:dw|

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