# Centripetal Acceleration of car

1. Oct 21, 2014

### bgrove

1. The problem statement, all variables and given/known data
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?

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

3. The attempt at a solution
I don't really know where to start on this one.

Per our answer key, the answer should be: 2.45 times faster.

2. Oct 21, 2014

### Phys student

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.

3. Oct 21, 2014

### Staff: 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

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