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Need help with polar DE

  1. Apr 13, 2010 #1


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    Hi guys,

    So I have gotten my assignment for my DE class and fortunately for me, someone had already posted up the questions on the net. Here it is:


    Anyway I have managed to do a number of the questions as below together with the answers:

    1) sinh [ln x] - sinh [ln w] = y/vx : whereby v= Vr/ Vs
    2) Have yet to try
    3) From the answer i got in (1), I just substituted y= 0 and x= -w, and i get something like this: Vr/ Vs = 0 ...... and since Vr = 0 and Vs is any value greater than 0, it is proven what the question wants... Not sure though if it is right :S
    4) No prob with this, got it proven
    5 and 6) I had some huge problems with this..... I cant integrate it...at all... please help.. I keep getting 0 for Vr/Vs
    7) No prob with this too, got it done
    8) Have yet to try

    So guys, I hope you all can help me figure out how to do 5 and 6 and perhaps see if my number 3 is right?

    Thanks so much...
  2. jcsd
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