Cars and Center of Mass


by Soaring Crane
Tags: cars, mass
Soaring Crane
Soaring Crane is offline
#1
Oct22-06, 09:41 PM
P: 483
Please check my answers.

A 1200-kg station wagon is moving along a straight highway at 12.0 m/s. Another car, with mass 1800 kg and speed 20.0 m/s, has its center of mass 40.0 m ahead of the center of mass of the station wagon.

a)Find the position of the center of mass of the system consisting of the two automobiles.

b) Find the magnitude of the total momentum of the system from the above data.

c) Find the speed of the center of mass of the system.

d) Find the total momentum of the system, using the speed of the center of mass.

a.x_cm = [40 m(1200 kg)]/(1200 kg + 1800 kg) = 16 m ? I set the car with the greater mass at (0,0).

b.Total p = 1200 kg*12 m/s + 1800 kg*20.0 m/s = 50400 kg*m/s

c.V_cm = (50400 kg*m/s)/( 1800 kg + 1200 kg) = 16.8 m/s

d.Using the answer from part c, (16.8 m/s)*(1200 kg + 1800 kg) = 50400 kg*m/s again

Thanks.
Phys.Org News Partner Science news on Phys.org
Cougars' diverse diet helped them survive the Pleistocene mass extinction
Cyber risks can cause disruption on scale of 2008 crisis, study says
Mantis shrimp stronger than airplanes
OlderDan
OlderDan is offline
#2
Oct22-06, 11:41 PM
Sci Advisor
HW Helper
P: 3,033
Looks good


Register to reply

Related Discussions
the geometric center of the Earth and the center of mass Classical Physics 9
Can two objects with the same center of mass oscillate about that center? Introductory Physics Homework 0
2 Cars Colliding with same mass Introductory Physics Homework 1
Help with problem of Center of mass, linear mass density and total mass Introductory Physics Homework 1
The center of Mass perfectly match the center of Force-> General Physics 9