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Physics 11 help ?

  1. Jan 11, 2009 #1
    Physics 11 help plz?!?

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

    a 1 200 kg car accelerates uniformly along level ground from rest to a speed of 80 km/h in 10 s. what is the power output of th motor?

    2. Relevant equations

    eff=(mgh/f*d)x100%
    p=f*v

    3. The attempt at a solution
    idk where 2 start...
     
  2. jcsd
  3. Jan 11, 2009 #2

    rock.freak667

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    Re: Physics 11 help plz?!?

    Seeing as how the car goes from rest to 80 km/h in 10 s, what is the acceleration produced by the car and hence the force produced by the car?
     
  4. Jan 11, 2009 #3
    Re: Physics 11 help plz?!?

    a=2.2m/s^2
    so what formula do i use?
     
  5. Jan 11, 2009 #4
    Re: Physics 11 help plz?!?

    Did you learn that P=W/t? where W=work and t=time?

    About the a= 2.2m/s^2, i didnt check the number, but if you know the acceleration, and you know the mass. Then use F=ma
     
  6. Jan 11, 2009 #5
    Re: Physics 11 help plz?!?

    ok so F=2640N and W=F*d so what's d?
     
  7. Jan 11, 2009 #6

    rock.freak667

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    Re: Physics 11 help plz?!?

    Use the second equation you put in the relevant equations section.
     
  8. Jan 11, 2009 #7
    Re: Physics 11 help plz?!?

    Yeah, you are making it harder on yourself if you use P=W/t, i was just bringing it up as another method to use at some point. You already know P=f*v and you have f and v
     
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