# Centripetal Acceleration of car

## Homework Statement

Two cars drive around in circles at constant speeds. Car B's circle is twice as large as car A's, but its centripetal acceleration is three times as large. How many times faster is car B driving than car A?

## Homework Equations

I'm trying to use a=(v^2/r) for centripetal acceleration.

## The Attempt at a Solution

I don't really know where to start on this one.

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You want to find a relation between the velocity of car A and car B, and you're given a relation between the radii of their circular paths and a relation between their centripetal accelerations. Try to write down some equations.

Chestermiller
Mentor
Use subscripts to represent the parameters for A and B. Thus, rA, vA, and aA are the radius, velocity, and acceleration of A, respectively, and similarly for B. Now, in terms of these parameters, write the centripetal acceleration equations for A and B respectively. How is rA related to rB? How is aA related to aB? This should give you enough to solve the problem.

Chet