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Mechanics (power)

  1. Jan 5, 2017 #1

    Kajan thana

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    1. The problem statement, all variables and given/known data

    The vehicle now accelerates to a constant speed of 55 m s–1. The useful power output of the motors is 22 kW at this speed.

    Calculate the horizontal resistive force acting on the vehicle?


    2. Relevant equations
    P=FV

    3. The attempt at a solution:

    F=P/V

    so the answer is 400N

    But what I do not understand is why are we using that formula and how do we know that is the resistive force?
     
  2. jcsd
  3. Jan 5, 2017 #2

    cnh1995

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    What is the net force acting on the vehicle?
     
  4. Jan 5, 2017 #3

    Kajan thana

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    I don't know the net force.
     
  5. Jan 5, 2017 #4

    cnh1995

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    What do you know about the net force from this?
     
  6. Jan 5, 2017 #5

    Kajan thana

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    it is zero
     
  7. Jan 5, 2017 #6

    cnh1995

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    Yes.
    So driving force=resistive force.
     
  8. Jan 5, 2017 #7

    Kajan thana

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    Thank you.
     
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