Posted by Y0gi on Tuesday, December 7, 2010 at 9:25am.
When four people with a combined mass of 320 kg sit down in a car, they find that the car drops 0.80 cm lower on its springs. Then they get out of the car and bounce it up and down. What is the frequency of the car's vibration if its mass (when it is empty) is 2.0 x 10^3 kg?

Physics  drwls, Tuesday, December 7, 2010 at 9:35am
Use the additional compression distance (0.0080 m), due to added tha weight of 320 kg*g, to determine the spring constant, k, in units of N/m.
k = 3136 N/.0008 m = ____
The frequency of car vibration is then
f = [1/(2 pi)]*sqrt(k/M)
where M = 2000 kg 
Physics  Anonymous, Wednesday, February 18, 2015 at 12:12am
2.25