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Caculating linear speed of a vehicle

  1. May 11, 2007 #1
    i need a formula for caculating linear speed of a vehicle.

    the question is

    wheel diameter 1.075 metres

    what is the linear speed of the vehicle when the wheel is rotating at 300 rev/min?

    thanks dan
     
  2. jcsd
  3. May 11, 2007 #2

    Hootenanny

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    Do you know any expressions for relating angular frequency to tangential velocity?
     
  4. May 11, 2007 #3
    no dont what that is, but i do know what angular velocity and angular acceleration is.

    i thought linear speed was diameter(metres) x pie x rev/min x 60 / 1000 would give you the speed in km/h

    which would give the answer 60.79 km/h

    but turns out its wrong.
     
  5. May 11, 2007 #4

    Hootenanny

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    Your answer looks good to me. If your entering your answers on webassign, beware of the number of significant figures you include.
     
  6. May 11, 2007 #5
    the book im reading must be wrong then, is linear speed just the same as speed then
     
  7. May 11, 2007 #6

    Hootenanny

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    Yes, just out of interest, what speed does your book return?
     
  8. May 11, 2007 #7
    this is the question out of the book

    the road wheels of a vechile are 600mm in diameter caculate the linear speed of the vechile in km/h if the wheels rotate at 560 rev/min?

    answer form book 63.36km/h

    my answer 63.3345079 which rounded up is 63.34

    i know its only 0.02 out but still that why i wasent sure
     
  9. May 11, 2007 #8

    Hootenanny

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    I agree with your answer.
     
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