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Finding X and Y components of a vector of magnitude

  1. Nov 17, 2014 #1
    1. A- What are the x and y components of a vector of magnitude 25m/s and direction of 45 degrees?

    B- What are the x and y components of a vector of magnitude 75N and a direction of 60 degrees.


    2. Are these the formulas you use?

    Vx=(R)Cos0
    Vy=(R)Sin0



    3. help plz
     
  2. jcsd
  3. Nov 17, 2014 #2

    Simon Bridge

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    Welcome to PF;
    Never mind trying to figure out which formula is for which - instead, use your knowledge of geometry.
    Start by drawing out a pair of x and y axes, then sketch the vector on those axes.
    If you draw a dotted line at 90deg from the x axis to the tip of the vector arrow, you will have a triangle where the vector is the hypotenuse.
    The components are the other two sides.
     
  4. Nov 20, 2014 #3
    90 degrees? As in a right angle? Can you clarify that
     
  5. Nov 20, 2014 #4
  6. Nov 20, 2014 #5

    Simon Bridge

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    That's right - "deg" = "degrees" (it's easier to type than those little circles).
    90deg = (pi/2)rad = "perpendicular to" = (yes) the right angle.
    It's how you normally read off a coordinate from an axis.

    Please be aware - I get an email notification when you reply to a thread I am participating in.
    I cannot reply any faster than I already do.
     
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