anonymous
  • anonymous
A car weighing 1400kg accelerates from 90 km/hr to 110 km/hr in 6.0s. a) assuming no friction, what was the power output of the car? b) If a frictional force of 700 N acted on the car over a distance of 400 m during the same 6.0-second acceleration, what would be the power output of the car if the same speed increase was observed?
Physics
chestercat
  • chestercat
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anonymous
  • anonymous
Figure out it's change in kinetic energy.
anonymous
  • anonymous
You have the mass and two velocities. So calculate the kinetic energy before and after acceleration.
anonymous
  • anonymous
Power is just going to be energy / time

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anonymous
  • anonymous
kinetic energy is 1/2 mass * velocity^2
anonymous
  • anonymous
You probably want to convert units to m/s
anonymous
  • anonymous
Multiply by 1000 and divide by 3600?
anonymous
  • anonymous
Yes
anonymous
  • anonymous
For b) " 700 N acted on the car over a distance of 400 m" Just remember that work = force * distance that will tell you how much energy was taken away
anonymous
  • anonymous
so subtract that out and calculate the power again.
anonymous
  • anonymous
@applesjgtl got it?
anonymous
  • anonymous
For part a, what value do I use for energy? Is it KE2-KE1?
anonymous
  • anonymous
@wio, still there?
anonymous
  • anonymous
For part a) use energy
anonymous
  • anonymous
then divide the change in energy by time to get power output.
anonymous
  • anonymous
Here's what I have
anonymous
  • anonymous
Oh, I get it. Thanks for your help!

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