Physics 11 help ?

  • Thread starter roxxyroxx
  • Start date
  • #1
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Physics 11 help plz?!?

Homework Statement



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?

Homework Equations



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

The Attempt at a Solution


idk where 2 start...
 

Answers and Replies

  • #2
rock.freak667
Homework Helper
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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?
 
  • #3
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a=2.2m/s^2
so what formula do i use?
 
  • #4
145
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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
 
  • #5
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ok so F=2640N and W=F*d so what's d?
 
  • #6
rock.freak667
Homework Helper
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Use the second equation you put in the relevant equations section.
 
  • #7
145
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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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