Physics 11 Help: Solving for Power Output of a Car Accelerating to 80 km/h

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    Physics Physics 11
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Homework Help Overview

The discussion revolves around calculating the power output of a car that accelerates from rest to a speed of 80 km/h over a period of 10 seconds. The subject area is physics, specifically focusing on concepts of motion, force, and power.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants explore the acceleration of the car and the resulting force, with one participant calculating the acceleration as 2.2 m/s². Questions arise regarding the appropriate formulas to use for power and work, as well as the distance traveled during acceleration.

Discussion Status

The discussion is active, with participants providing various approaches and formulas related to power, force, and work. Some guidance has been offered regarding the use of different equations, but there is no explicit consensus on the best method to proceed.

Contextual Notes

Participants are working within the constraints of a homework assignment, which may limit the information they can use or the methods they can apply. There is an ongoing exploration of assumptions related to the problem setup.

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Physics 11 help please?!?

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...
 
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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?
 


a=2.2m/s^2
so what formula do i use?
 


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
 


ok so F=2640N and W=F*d so what's d?
 


Use the second equation you put in the relevant equations section.
 


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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