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Can someone help me solve this equation?

  1. Sep 29, 2011 #1
    1. The problem statement, all variables and given/known data

    Here's the equation I have:

    0-730=V0sin(-37.0)(5.00)-(1/2)(9.8m/s2)(5.00)2

    2. Relevant equations



    3. The attempt at a solution

    I know the answer is 202 m/s. I just can't figure out how to get there. I've reduced it to:

    -730=(V0sin(-37.0))(5.00)-122.5

    The sine is throwing me a curve ball. It's just an example equation out of the book so that I can solve the real one in my homework. I'm sure it's something simple I'm missing.
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Sep 29, 2011 #2

    gneill

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    Staff: Mentor

    sin(-37.0°) has a real valued result. What is it?
     
  4. Sep 29, 2011 #3
    Can I ask why is the sin causing you a problem?
     
  5. Sep 29, 2011 #4

    vela

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    Staff Emeritus
    Science Advisor
    Homework Helper
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    Why is it confusing you? sin -37.0° is just a number.
     
    Last edited: Sep 29, 2011
  6. Sep 29, 2011 #5
    If you're using a claulator, make sure your trig functions use degrees rather than radians - that might be the trick
     
  7. Sep 29, 2011 #6
    sin(-37.0)= -.601815

    But when I try to solve -730=V0(-.601815)(5.00)-122.5 I get -730=V0-125.509. I just don't see how to go from that to the answer V0=202 m/s
     
  8. Sep 29, 2011 #7

    gneill

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    Staff: Mentor

    Vo multiplies (-.601815)(5.00). Don't add (-.601815)(5.00) to -122.5!
     
  9. Sep 29, 2011 #8
    Haha! Success!!! I've figured it out. I knew it had to be something simple. I just needed someone to clear things up for me. Thanks a million!
     
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