Physics 011
A of
PQ#7A
Chapter
7 : Linear Momentum
Practice Questions


1. 

An Olympic
diver dives off the highdiving platform. The magnitude of his momentum will
be a maximum at point
The magnitude of momentum is speed times mass (constant). Review Section 71 in Giancoli. 


2. 

Which of
the following can best be described as an elastic collision? The earth is dented, branches are broken. This is not elastic. Review Section 74 in Giancoli. 


3. 

The Center
of Mass of which of the following objects would not lie within the body
itself? Review Section 78 in Giancoli. 


4. 

What is
the magnitude of the impulse as shown in the following figure?
Review Section 73 in Giancoli. 


5. 

If the
impulse is applied to a particle at rest what will be its final momentum? Review Section 73 in Giancoli. 


6. 

What is
the impulse shown in the following figure?
You probably only found the area of one of the triangles. 


7. 

If the impulse is applied to a 200 gm model rocket at rest what will be
its final speed? Review Section 73 in Giancoli. 


8. 

What
constant force acting over the same time as the force in question 6 would
produce the same impulse? The time period is nine seconds. Review Figure 710 in Giancoli. 


9. 

If each
mass in the figure is 1 kg, what is the x location of the center of mass?
Review Example 711 in Giancoli. 


10. 

If each mass in the figure is 1 kg, what is the y location of the center
of mass? Review Section 78 in Giancoli. 


11. 

If the mass of m_{1} and m_{3} in the figure is 1 kg and m_{2}
is 2 kg, what is the x location of the center of mass? Review Section 78 in Giancoli. 


12. 

If the mass of m_{1} and m_{3} in the figure is 1 kg and m_{2}
is 2 kg, what is the y location of the center of mass? 


13. 

If the mass of m_{1} is 1 kg and m_{3} is 2 kg in the
figure and m_{2} is 3 kg, what is the x location of the center of
mass? Review Section 78 in Giancoli. 


14. 

If the mass of m_{1} is 1 kg and m_{3} is 2 kg in the figure and m_{2} is 3 kg, what is the y location of the center of mass? 


15. 

If all the
masses in the figure have a mass of 2 kg, and m_{2} has speed 2 m/s
and m_{3} has a speed of 4 m/s, what is the xcomponent of the
momentum of the center of mass?
Review Section 710 in Giancoli. 


16. 

If all the masses in the figure have a mass of 2 kg, and m_{2} has
speed 2 m/s and m_{3} has a speed of 4 m/s, what is the ycomponent
of the momentum of the center of mass? Did you forget that m2 has a mass of 2 kg. Review Section 78 in Giancoli. 


17. 

What is the magnitude of the momentum of the center of mass of the system
of particles in question 15? This is the magnitude of the x component. Review Section 710 in Giancoli. 


18. 

What is
the direction of the momentum of the center of mass of the particles in
question 15, as measured in degrees counter clockwise from East. 


19. 

A 12000 kg
railroad car travelling at 10 m/s strikes and couples with a 6000 kg caboose
at rest. What is the speed of the final combination? This would be true if it were the 6000 kg car that is moving. Review Example 73 in Giancoli. 


20. 

A 12000 kg
railroad car travelling at 10 m/s strikes and couples with a 6000 kg caboose
at rest. What is the loss of Mechanical Energy in the collision? Review Example 78 in Giancoli. 


21. 

A 12000 kg
railroad car travelling at 10 m/s strikes and couples with a 6000 kg caboose
at rest. What would be the speed of the combination of railroad cars if the
caboose was initially rolling towards the other car with a speed of 2 m/s? The momentum can not cancel out because they don't have the same magnitude. Review Section 72 in Giancoli. 


22. 

A billiard
ball travelling to the right at 6m/s overtakes and strikes an identical ball
travelling at 3 m/s. What is the speed of the first ball after the collision? 


23. 

A billiard
ball travelling to the right at 6m/s overtakes and strikes an identical ball
travelling at 3 m/s. What is the speed of the second ball after the
collision? With this answer energy is not conserved. Review Section 75 in Giancoli. 


24. 

A billiard
ball travelling to the right at 6m/s overtakes and strikes an identical ball
travelling at 3 m/s. What is the speed of the first ball after collision if
the second ball was travelling at it (instead of away from it) with a speed
of 3 m/s before collision? The momentum of the second ball is negative. Review Section 75 in Giancoli. 


25. 

What is
the speed of the second ball in question 24 after collision? The balls can't pass through each other. Review Section 75 in Giancoli. 