Spring constant and oscillation frequency

1. Dec 3, 2007

aligass2004

1. The problem statement, all variables and given/known data
A compact car has a mass of 1300kg. Assume that the care has one spring on each wheel, that the springs are identical, and that the mass is equally distributed over the four springs.

a.) What is the spring constant of each spring if the empty car bounces up and down 1.4 times each second?
b.) What will be the car's oscillation frequency while carrying four 90kg passengers?

2. Relevant equations

3. The attempt at a solution

I know for part a I will use f = 1/2pi [sq rt (k/m)], which will be k = m (f2pi)^2 when rearranged. I'm just not sure what the frequency would be.

2. Dec 3, 2007

G01

For part a) the frequency is given to you. 1.4times/second is a frequency.

3. Dec 3, 2007

Mindscrape

The car bounces up and down 1.4 times each second. What is the definition of frequency?

If you are talking about the second part, all you have to do is use the information you solved for, and change the mass accordingly.

4. Dec 3, 2007

G01

The definition of a frequency is the "number of oscillations per second. This is what you are given. The car bounces up and down (oscillates) 1.4 times each second. So,

f=1.4

5. Dec 3, 2007

aligass2004

I tried using 1.4 for the frequency, and I got 1.01E5, but it wasn't right.

6. Dec 4, 2007

Mindscrape

Man, you can't answer his questions for him.

How, exactly, did you solve it, aligass?

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