# Homework Help: Springs on a car

1. Jun 17, 2009

### synchronous

1. The problem statement, all variables and given/known data
An automobile can be considered to be mounted on four identical springs as far as vertical oscillations are concerned. The springs of a certain car are adjusted so that the oscillations have a frequency of 3 Hz.
(a) What is the spring constant of each spring if the mass of the car is 1300 kg and the weight is evenly distributed over the springs?

2. Relevant equations

w = (k/m)^(1/2)
k(total) = k1 + k2 + k3 + k4 = 4k

3. The attempt at a solution

Since the springs are arranged in a parallel fashion, I can add their individual spring constants for an overall constant. Since the springs are identical, I can rewrite the sum of constants as 4k. Then, using the first equation listed above I have:

3 = (4k/1300)^(1/2) and solving for k I found the solution to be 2925 N/m. What's wrong with my approach?

2. Jun 17, 2009

### RoyalCat

w =/= f
w = 2πf
That's the only thing I can spot that's wrong. See if that gets you to the text-book's answer.

You're welcome. ^^

Last edited: Jun 17, 2009
3. Jun 17, 2009

### synchronous

Dumb mistake on my part...thanks for the help...you're right on the money!