Posted by **Jacob** on Tuesday, April 13, 2010 at 4:10pm.

Two geekie physics students with a combined mass of 131 kg jump into their old car to run out for some late night pizza. The distance between the front and back axles of the car is 2.9 m. When they get in the car, the springs compress a total of 9.3 cm. On their way to the Pizza Hut, when they go over a bump, the car oscillates up and down with a period of 1.6 seconds.

(a) What is mass of the car?

Can you guys figure it out??

i got 2020.185 for K constant and then i used the formula m=kt^2/4pi^2 but that is wrong and it's giving me the same mass help or guide me please.

- Physics -
**drwls**, Tuesday, April 13, 2010 at 4:32pm
From the compression deltaX of the springs when they get in, you know that the spring constant of the suspension system is

k = F/deltaX = 131*g*/0.093 = 13800 N/m

The oscillation period is 2 pi sqrt [(M+m)/k] = 1.6

where M is the car weight and m is the additional weight of the passengers.

Solve for M+m and them subtract m

(M+m)/k = 6.48*10^-2 s^2

M+m = 895 kg

m = 764 kg

## Answer this Question

## Related Questions

- Physics - Two geekie physics students with a combined mass of 131 kg jump into ...
- physics! - The mass of an automobile is 1160kg, and the distance between its ...
- Physics - The driver of a car on a horizontal road makes an emergency stop by ...
- Physics - Two people with a combined mass of 135 kg hop into an old car with ...
- physics - The CM of an empty 1300 kg car is 2.40 m behind the front of the car. ...
- physics - The CM of an empty 1300 kg car is 2.40 m behind the front of the car. ...
- Physics - A 1480 kg automobile has a wheel base (the distance between the axles...
- physics! - Late one night on a highway, a car speeds by you and fades into the ...
- physic - Two people with a combined mass of 130 kg hop into an old car with worn...
- Physics - A 965 kg car is driving along a boardwalk. The car's center of mass is...