Kinetic Energy and Work Homework Help

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Homework Help Overview

The discussion revolves around a physics problem involving kinetic energy and work, specifically focusing on a car's acceleration from 17 m/s to 33 m/s while merging onto a freeway. Participants are exploring how to calculate the power supplied by the car's engine based on given work and force values.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants are attempting to determine the time required for the car's acceleration, which is necessary to calculate power. There is uncertainty about whether the problem statement includes all relevant information, particularly regarding average power.

Discussion Status

The discussion is ongoing, with participants clarifying the problem statement and identifying missing information, such as the distance over which the acceleration occurs. Some guidance has been provided regarding the importance of the distance in calculating time.

Contextual Notes

Participants note that the original problem statement may have omitted the distance of 80 meters, which is crucial for determining the time taken for the acceleration.

KTiaam
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Homework Statement



While merging onto a freeway, a 1900 kg car accelerates from 17 m/s to 33 m/s

What power did the engine supply?

W = 7.6 x 105 J
F = 9500 N

Homework Equations



P=W/T

The Attempt at a Solution



Not sure how to find T.
 
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KTiaam said:

Homework Statement



While merging onto a freeway, a 1900 kg car accelerates from 17 m/s to 33 m/s

What power did the engine supply?

W = 7.6 x 105 J
F = 9500 N

Homework Equations



P=W/T

The Attempt at a Solution



Not sure how to find T.

Is that the whole problem statement? Are you sure it didn't ask for the average power?
 
the previous questions were

a)

how much work was done?

which i found out was 7.6 x 105

b) If the velocity change took 80m of road what average force did the cars energy supply?

which i found out was 9500 N

that was all that was given to me
 
KTiaam said:
the previous questions were

a)

how much work was done?

which i found out was 7.6 x 105

b) If the velocity change took 80m of road what average force did the cars energy supply?

which i found out was 9500 N

that was all that was given to me

You left the 80m distance out of your original post. That is the piece of information that you need to figure out how long it took the car to accelerate from v1 to v2 in 80m distance...
 

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