I'm sorry, I have no idea how to attempt this question.

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Homework Help Overview

The problem involves determining the maximum speed a car can travel around a circular racetrack, given the radius and coefficient of friction. The subject area relates to dynamics and forces, particularly centripetal force and friction.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the relationship between friction and centripetal force, with some questioning the relevance of mass in the calculations. There is an exploration of the equations related to forces acting on the car.

Discussion Status

The discussion is active, with participants sharing insights about the forces involved and the equations that may be relevant. Some guidance has been offered regarding the relationship between friction and centripetal force, though no consensus has been reached on how to proceed with the calculations.

Contextual Notes

Participants note the absence of the car's mass as a potential constraint in solving the problem. There is also a mention of common misconceptions regarding the role of mass in such dynamics problems.

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Friction provides the centripetal force necessary for a car to reval around a circular flat racetrack. What ios the maximum speed at which a car can travel safely around a track of radius 80m if the coefficient of friction between the tyres and road is 0.3?

I really have no idea how to attempt this question...
 
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Do you know how to calculate the "centrifugal force" on the car? The friction force, equal to 0.3 times the weight of the car, must be equal to that.
 
well the centrifugal force is just equal but opposite to the centripetal force
which i don't know...and i don't know the MASS of the car and thus can't calculate the weight
 
A common thing for people who are just starting physics is to forget that, often times, mass is irrelevant to finding a solution.

The centrifugal forces must equal friction, correct? What do you do when two equations equal each other?

Whenever I get stuck, I like to just starting writing off my known equations:

[tex]\Sigma F_c = m\frac{v^2_t}{r}[/tex]

[tex]F_f = \mu m g[/tex]
 

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