Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Stuck on these

  1. May 8, 2005 #1
    Stuck on these....

    1.Convert the following equation to Cartesian coordinates r sin (angle) = -2.

    2.Convert the rectangular equation y = -5x + 4 to a polar equation.

    3.An aircraft going from Atlanta, GA to New York, NY on a bearing of S69oE is traveling at a speed of 430 miles per hour. The wind is blowing out of the north to south at a speed of 25 miles per hour. Find the ground speed and the plane's true bearing.

    4.Two teams are playing push ball with a large 8 foot diameter ball. One team exerts a force represented by the vector a = 2 i + -5 j , and the other team exerts a force represented by the vector b = -8 i -3 j . Determine the combined force magnitude.
  2. jcsd
  3. May 8, 2005 #2
    The translators from polar to cartesian and backwards are:

    [tex] x = r cos(\theta) [/tex]

    [tex] y = r sin(\theta) [/tex]

    And from the above two you can see that

    [tex] x^2 + y^2 = r^2 [/tex]

    This is enough for #1 and #2

    3. Vector addition, draw a vector with heading 69 degrees south of east and label its magnitude 430mph. Then add another vector to it with south heading at 25mph. The total heading and speed will be the sum of the two.

    4. Same as #3, draw the two vectors and find the vector sum.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook