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F=ma problem

  1. Feb 2, 2016 #1
    1. The problem statement, all variables and given/known data
    An airplane with a mass of 5.32 x 10^4 Kg accelerates down the runway at 1.76 m/s^2 [forward]. Calculate the net force acting on the airplane.

    2. Relevant equations

    3. The attempt at a solution

    I did this by multiplying the two given values, but my answer was 93632N [forward]. The answer in the book is 3.02 x 10^4 N[forward]. I have no idea where I went wrong- I've tried this twice and got the same answer both times
  2. jcsd
  3. Feb 2, 2016 #2


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    Staff: Mentor

    It's quite possible that the book has an error in its answer key. Sometimes they change the question values for new editions and miss changing the answers accordingly.

    Your result looks good in terms of magnitude, but you should round to the correct number of significant figures.
  4. Feb 2, 2016 #3
    Would the correct significant figures be 9.4 x 10^4 N?
  5. Feb 2, 2016 #4


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    Staff: Mentor

    How many significant figures do the given data values have? How many in "9.4"?
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