Question 1

A  4.00 kg4.00 \mathrm{~kg}4.00 kg  object is moving at  5.00 m/s5.00 \mathrm{~m} / \mathrm{s}5.00 m/s  NORTHWEST. It strikes a  6.00 kg6.00 \mathrm{~kg}6.00 kg  object that is moving SOUTHWEST at  2.00 m/s2.00 \mathrm{~m} / \mathrm{s}2.00 m/s . The objects collide perfectly inelastically (stick together) . The velocity of the  6.00 kg6.00 \mathrm{~kg}6.00 kg  object after the collision is

Accepted Answer

A)    3.89 m/s3.89 \mathrm{~m} / \mathrm{s}3.89 m/s  at an angle of 35.0 degrees NORTH of WEST.
B)    2.33 m/s2.33 \mathrm{~m} / \mathrm{s}2.33 m/s  at an angle of 35.0 degrees NORTH of WEST.
C)    2.33 m/s2.33 \mathrm{~m} / \mathrm{s}2.33 m/s  at an angle of 45.0 degrees NORTH of WEST.
D)    3.89 m/s3.89 \mathrm{~m} / \mathrm{s}3.89 m/s  at an angle of 14.0 degrees NORTH of WEST.
E)    2.33 m/s2.33 \mathrm{~m} / \mathrm{s}2.33 m/s  at an angle of 14.0 degrees NORTH of WEST. F) B) and C)
G) A) and B)

Question 2

A  3.00 kg3.00 \mathrm{~kg}3.00 kg  mass is located at  x=2.0 cm\mathrm{x}=2.0 \mathrm{~cm}x=2.0 cm  and  y=−4.0 cm\mathrm{y}=-4.0 \mathrm{~cm}y=−4.0 cm . A  3.00 kg3.00 \mathrm{~kg}3.00 kg  mass is located at  x=−5.0 cm\mathrm{x}=-5.0 \mathrm{~cm}x=−5.0 cm  and  y=\mathrm{y}=y=   2.0 cm2.0 \mathrm{~cm}2.0 cm . A  4.00 kg4.00 \mathrm{~kg}4.00 kg  mass is located at  x=−3.0 cm\mathrm{x}=-3.0 \mathrm{~cm}x=−3.0 cm  and  y=−3.0 cm\mathrm{y}=-3.0 \mathrm{~cm}y=−3.0 cm . Where is the center of mass  (x,y) (\mathrm{x}, \mathrm{y}) (x,y)   ?

Accepted Answer

A)    (+2.1 cm,−1.8 cm) (+2.1 \mathrm{~cm},-1.8 \mathrm{~cm}) (+2.1 cm,−1.8 cm)  
B)    (−0.10 cm,−0.50 cm) (-0.10 \mathrm{~cm},-0.50 \mathrm{~cm}) (−0.10 cm,−0.50 cm)  
C)    (−2.1 cm,−1.8 cm) (-2.1 \mathrm{~cm},-1.8 \mathrm{~cm}) (−2.1 cm,−1.8 cm)  
D)    (+1.1 cm,−2.0 cm) (+1.1 \mathrm{~cm},-2.0 \mathrm{~cm}) (+1.1 cm,−2.0 cm)  
E)    (−2.1 cm,+1.8 cm) (-2.1 \mathrm{~cm},+1.8 \mathrm{~cm}) (−2.1 cm,+1.8 cm) F) A) and B)
G) B) and D)

Question 3

An  1800 kg1800 \mathrm{~kg}1800 kg  car traveling at  35.0 m/s35.0 \mathrm{~m} / \mathrm{s}35.0 m/s  strikes a wall. If the car comes to rest in 0.500 seconds, then the magnitude of the average force of the wall on the car is

Accepted Answer

A)    3.33×105 N3.33 	imes 10^{5} \mathrm{~N}3.33×105 N .
B)    1.26×105 N1.26 	imes 10^{5} \mathrm{~N}1.26×105 N .
C)    0.640×105 N0.640 	imes 10^{5}  \mathrm{~N}0.640×105 N .
D)    0.330×105 N0.330 	imes 10^{5} \mathrm{~N}0.330×105 N .
E)    2.77×105 N2.77 	imes 10^{5} \mathrm{~N}2.77×105 N . F) A) and E)
G) A) and D)

Question 4

Two objects of equal mass and velocity hit a wall. They both rebound with the same velocity in the opposite direction. Both objects experience the same momentum change but one experiences twice the average force as the other. Which of the following statements is true?

Accepted Answer

A)   The change in the kinetic energy is different for the two objects.
B)   The contact time between one of the object and the wall is one-fourth the contact time of the other.
C)   The contact time between one of the objects and the wall is  1/31 / 31/3  the contact time of the other.
D)   The contact times between the objects and the wall are equal.
E)   The contact time between one of the objects and the wall is twice the contact time of the other. F) B) and E)
G) A) and B)

Question 5

A  4.00 kg4.00 \mathrm{~kg}4.00 kg  ball is moving at  3.00 m/s3.00 \mathrm{~m} / \mathrm{s}3.00 m/s  to the NORTH and a  5.00 kg5.00 \mathrm{~kg}5.00 kg  ball is moving at  2.00 m/s2.00 \mathrm{~m} / \mathrm{s}2.00 m/s  to the NORTHEAST. The total momentum of the system is

Accepted Answer

A)    43.00 kg m/s43.00 \mathrm{~kg} \mathrm{~m} / \mathrm{s}43.00 kg m/s  at an angle of 45.0 degrees NORTH of EAST.
B)    26.1 kg m/s26.1 \mathrm{~kg} \mathrm{~m} / \mathrm{s}26.1 kg m/s  at an angle of 69.7 degrees SOUTH of EAST.
C)    20.3 kg m/s20.3 \mathrm{~kg} \mathrm{~m} / \mathrm{s}20.3 kg m/s  at an angle of 24.6 degrees SOUTH of EAST.
D)    26.1 kg m/s26.1 \mathrm{~kg} \mathrm{~m} / \mathrm{s}26.1 kg m/s  at an angle of 24.6 degrees NORTH of EAST.
E)    20.3 kg m/s20.3 \mathrm{~kg} \mathrm{~m} / \mathrm{s}20.3 kg m/s  at an angle of 69.7 degrees NORTH of EAST. F) A) and B)
G) B) and D)

Question 6

A  4.00 kg4.00 \mathrm{~kg}4.00 kg  object is moving at  5.00 m/s5.00 \mathrm{~m} / \mathrm{s}5.00 m/s  NORTH. It strikes a  6.00 kg6.00 \mathrm{~kg}6.00 kg  object that is moving WEST at 2.00  m/s\mathrm{m} / \mathrm{s}m/s . The objects undergo a perfectly inelastic (stick together)  collision. The kinetic energy lost in the collision is

Accepted Answer

A)    28.7 J28.7 \mathrm{~J}28.7 J .
B)    34.8 J34.8 \mathrm{~J}34.8 J .
C)    14.9 J14.9 \mathrm{~J}14.9 J .
D)    20.4 J20.4 \mathrm{~J}20.4 J .
E)    18.7 J18.7 \mathrm{~J}18.7 J . F) D) and E)
G) B) and C)

Question 7

A  5.00 kg5.00 \mathrm{~kg}5.00 kg  ball is moving at  4.0 m/s4.0 \mathrm{~m} / \mathrm{s}4.0 m/s  to the right and a  6.00 kg6.00 \mathrm{~kg}6.00 kg  ball is moving at  3.00 m/s3.00 \mathrm{~m} / \mathrm{s}3.00 m/s  to the left. The total momentum of the system is

Accepted Answer

A)    20 kg m/s20 \mathrm{~kg} \mathrm{~m} / \mathrm{s}20 kg m/s  to the right.
B)    18 kg m/s18 \mathrm{~kg} \mathrm{~m} / \mathrm{s}18 kg m/s  to the left.
C)    2.0 kg m/s2.0 \mathrm{~kg} \mathrm{~m} / \mathrm{s}2.0 kg m/s  to the left.
D)    2.0 kg m/s2.0 \mathrm{~kg} \mathrm{~m} / \mathrm{s}2.0 kg m/s  to the right.
E)    38 kg m/s38 \mathrm{~kg} \mathrm{~m} / \mathrm{s}38 kg m/s  to the right. F) A) and B)
G) C) and E)

Question 8

A  4.00 kg4.00 \mathrm{~kg}4.00 kg  object is moving at  5.00 m/s5.00 \mathrm{~m} / \mathrm{s}5.00 m/s  EAST. It strikes a  6.00 kg6.00 \mathrm{~kg}6.00 kg  object that is at rest. The objects collide elastically. The velocity of  4.00 kg4.00 \mathrm{~kg}4.00 kg  object after the collision is in the SOUTHWEST direction. The speed of the  6.00 kg6.00 \mathrm{~kg}6.00 kg  object after the collision is

Accepted Answer

A)    3.02 m/s3.02 \mathrm{~m} / \mathrm{s}3.02 m/s .
B)    3.96 m/s3.96 \mathrm{~m} / \mathrm{s}3.96 m/s .
C)    2.38 m/s2.38 \mathrm{~m} / \mathrm{s}2.38 m/s .
D)    4.06 m/s4.06 \mathrm{~m} / \mathrm{s}4.06 m/s .
E)    5.22 m/s5.22 \mathrm{~m} / \mathrm{s}5.22 m/s . F) B) and C)
G) B) and E)

Question 9

A  30.00 kg30.00 \mathrm{~kg}30.00 kg  mass falls from a height of  2.000 m2.000 \mathrm{~m}2.000 m . The magnitude of the momentum of the mass just before it hits the ground is

Accepted Answer

A)    320.0 kg m/s320.0 \mathrm{~kg} \mathrm{~m} / \mathrm{s}320.0 kg m/s .
B)    442.4 kg m/s442.4 \mathrm{~kg} \mathrm{~m} / \mathrm{s}442.4 kg m/s .
C)    187.8 kg m/s187.8 \mathrm{~kg} \mathrm{~m} / \mathrm{s}187.8 kg m/s .
D)    502.1 kg m/s502.1 \mathrm{~kg} \mathrm{~m} / \mathrm{s}502.1 kg m/s .
E)    144.2 kg m/s144.2 \mathrm{~kg} \mathrm{~m} / \mathrm{s}144.2 kg m/s . F) None of the above
G) B) and C)

Question 10

A  4.00 kg4.00 \mathrm{~kg}4.00 kg  ball is moving at  4.0 m/s4.0 \mathrm{~m} / \mathrm{s}4.0 m/s  to the right and a  6.00 kg6.00 \mathrm{~kg}6.00 kg  ball is moving at  3.00 m/s3.00 \mathrm{~m} / \mathrm{s}3.00 m/s  to the left. The total momentum of the system is

Accepted Answer

A)    34 kg m/s34 \mathrm{~kg} \mathrm{~m} / \mathrm{s}34 kg m/s  to the left.
B)    16 kg m/s16 \mathrm{~kg} \mathrm{~m} / \mathrm{s}16 kg m/s  to the right.
C)    2.0 kg m/s2.0 \mathrm{~kg} \mathrm{~m} / \mathrm{s}2.0 kg m/s  to the right.
D)    2.0 kg m/s2.0 \mathrm{~kg} \mathrm{~m} / \mathrm{s}2.0 kg m/s  to the left.
E)    18 kg m/s18 \mathrm{~kg} \mathrm{~m} / \mathrm{s}18 kg m/s  to the left. F) B) and E)
G) A) and E) D

Question 11

If a  5.00 kg5.00 \mathrm{~kg}5.00 kg  mass is moving EAST at  10.0 m/s10.0 \mathrm{~m} / \mathrm{s}10.0 m/s  and a  15.0 kg15.0 \mathrm{~kg}15.0 kg  mass is moving WEST at  10 m/s10 \mathrm{~m} / \mathrm{s}10 m/s , what is the velocity of the center of mass of the pair?

Accepted Answer

A)    5.0 m/sEAST5.0 \mathrm{~m} / \mathrm{s} \mathrm{EAST}5.0 m/sEAST 
B)    5.0 m/sWEST5.0 \mathrm{~m} / \mathrm{s} \mathrm{WEST}5.0 m/sWEST 
C)    10 m/s10 \mathrm{~m} / \mathrm{s}10 m/s  EAST
D)    10 m/s10 \mathrm{~m} / \mathrm{s}10 m/s  WEST E) B) and C)
F) None of the above B

Question 12

A  4.0 kg4.0 \mathrm{~kg}4.0 kg  ball is traveling at  5.0 m/s5.0 \mathrm{~m} / \mathrm{s}5.0 m/s  to the right and strikes a wall. The ball bounces off the wall with a velocity of  4.0 m/s4.0 \mathrm{~m} / \mathrm{s}4.0 m/s  to the left. The change in momentum of the ball is

Accepted Answer

A)    4.0 kg m/s4.0 \mathrm{~kg} \mathrm{~m} / \mathrm{s}4.0 kg m/s  left.
B)    26 kg m/s26 \mathrm{~kg} \mathrm{~m} / \mathrm{s}26 kg m/s  left.
C)    36 kg m/sright.36 \mathrm{~kg} \mathrm{~m} / \mathrm{s} \mathrm{right.}36 kg m/sright. 
D)    36 kg m/s36 \mathrm{~kg} \mathrm{~m} / \mathrm{s}36 kg m/s  left.
E)    30 kg m/s30 \mathrm{~kg} \mathrm{~m} / \mathrm{s}30 kg m/s  right. F) B) and E)
G) All of the above D

Question 13

A  5.00 kg5.00 \mathrm{~kg}5.00 kg  mass is moving at  4.00 m/s30.04.00 \mathrm{~m} / \mathrm{s} 30.04.00 m/s30.0  degrees SOUTH of WEST and a  2.00 kg2.00 \mathrm{~kg}2.00 kg  mass is moving at 3.00  m/s60.0\mathrm{m} / \mathrm{s} 60.0m/s60.0  degrees SOUTH of EAST. Find the velocity of the center of mass, letting  (a) =(\mathrm{a}) =(a) =  the east-west component, and (b)  = the north-south component.

Accepted Answer

A)    a=−2.17 m/s,b=+2.05 m/s\mathrm{a}=-2.17 \mathrm{~m} / \mathrm{s}, \mathrm{b}=+2.05 \mathrm{~m} / \mathrm{s}a=−2.17 m/s,b=+2.05 m/s .
B)    a=+2.17 m/s,b=−2.05 m/s\mathrm{a}=+2.17 \mathrm{~m} / \mathrm{s}, \mathrm{b}=-2.05 \mathrm{~m} / \mathrm{s}a=+2.17 m/s,b=−2.05 m/s .
C)    a=−2.05 m/s,b=−2.17 m/s\mathrm{a}=-2.05 \mathrm{~m} / \mathrm{s}, \mathrm{b}=-2.17 \mathrm{~m} / \mathrm{s}a=−2.05 m/s,b=−2.17 m/s .
D)    a=−2.05 m/s,b=+2.17 m/s\mathrm{a}=-2.05 \mathrm{~m} / \mathrm{s}, \mathrm{b}=+2.17 \mathrm{~m} / \mathrm{s}a=−2.05 m/s,b=+2.17 m/s .
E)    a=+2.05 m/s,b=−2.17 m/s\mathrm{a}=+2.05 \mathrm{~m} / \mathrm{s}, \mathrm{b}=-2.17 \mathrm{~m} / \mathrm{s}a=+2.05 m/s,b=−2.17 m/s . F) A) and C)
G) B) and E)

Question 14

A  2.0 kg2.0 \mathrm{~kg}2.0 kg  ball is moving at  4.0 m/s4.0 \mathrm{~m} / \mathrm{s}4.0 m/s  WEST. The momentum of the ball is

Accepted Answer

A)    10 kg m/s10 \mathrm{~kg} \mathrm{~m} / \mathrm{s}10 kg m/s  WEST.
B)    6.00 kg m/s6.00 \mathrm{~kg} \mathrm{~m} / \mathrm{s}6.00 kg m/s  WEST.
C)    8.0 kg m/s8.0 \mathrm{~kg} \mathrm{~m} / \mathrm{s}8.0 kg m/s  WEST.
D)    12 kg m/s12 \mathrm{~kg} \mathrm{~m} / \mathrm{s}12 kg m/s  WEST.
E)    4.00 kg m/s4.00 \mathrm{~kg} \mathrm{~m} / \mathrm{s}4.00 kg m/s  WEST. F) A) and C)
G) C) and E)

Question 15

An apple and an orange are connected by a straw of negligible mass. If the centers of the fruits are  26 cm26 \mathrm{~cm}26 cm  apart and the center of mass of the pair is  11 cm11 \mathrm{~cm}11 cm  from the apple, what is the ratio of  mapple \mathrm{m}_{	ext {apple }}mapple ​  to  morange \mathrm{m}_{	ext {orange }}morange ​  ?

Accepted Answer

A)    26/1126 / 1126/11 
B)    15/1115 / 1115/11 
C)    15/2615 / 2615/26 
D)    26/1526 / 1526/15 
E)    11/1511 / 1511/15 F)   11/2611 / 2611/26G) A) and B)
H) D) and E)

Question 16

A  3.00 kg3.00 \mathrm{~kg}3.00 kg  object is moving at  5.00 m/s5.00 \mathrm{~m} / \mathrm{s}5.00 m/s  EAST. It catches up to and strikes a  6.00 kg6.00 \mathrm{~kg}6.00 kg  that is moving EAST at  2.00 m/s2.00 \mathrm{~m} / \mathrm{s}2.00 m/s . The objects undergo an elastic collision in the EAST-WEST direction. The velocity of the  3.00 kg3.00 \mathrm{~kg}3.00 kg  object after the collision is

Accepted Answer

A)    4.00 m/s4.00 \mathrm{~m} / \mathrm{s}4.00 m/s  EAST.
B)    3.00 m/s3.00 \mathrm{~m} / \mathrm{s}3.00 m/s  EAST.
C)    1.00 m/s1.00 \mathrm{~m} / \mathrm{s}1.00 m/s  EAST.
D)    1.00 m/s1.00 \mathrm{~m} / \mathrm{s}1.00 m/s  WEST.
E)    4.00 m/s4.00 \mathrm{~m} / \mathrm{s}4.00 m/s  WEST. F) B) and C)
G) None of the above

Question 17

A  30.0 g30.0 \mathrm{~g}30.0 g  mass is located at the origin. Where must a mass of  10.0 g10.0 \mathrm{~g}10.0 g  be located if the coordinates of the center of mass are  (0.00 cm,10.0 cm) (0.00 \mathrm{~cm}, 10.0 \mathrm{~cm}) (0.00 cm,10.0 cm)   ?

Accepted Answer

A)    (0.00 cm,5.00 cm) (0.00 \mathrm{~cm}, 5.00 \mathrm{~cm}) (0.00 cm,5.00 cm)  
B)    (0.00 cm,40.0 cm) (0.00 \mathrm{~cm}, 40.0 \mathrm{~cm}) (0.00 cm,40.0 cm)  
C)    (0.00 cm,20.0 cm) (0.00 \mathrm{~cm}, 20.0 \mathrm{~cm}) (0.00 cm,20.0 cm)  
D)    (0.00 cm,10.0 cm) (0.00 \mathrm{~cm}, 10.0 \mathrm{~cm}) (0.00 cm,10.0 cm)  
E)    (0.00 cm,7.50 cm) (0.00 \mathrm{~cm}, 7.50 \mathrm{~cm}) (0.00 cm,7.50 cm) F) A) and B)
G) A) and E)

Question 18

A  3.00 kg3.00 \mathrm{~kg}3.00 kg  mass is located at  x=2.0 cm\mathrm{x}=2.0 \mathrm{~cm}x=2.0 cm  and  y=0.0 cm\mathrm{y}=0.0 \mathrm{~cm}y=0.0 cm . A  3.00 kg3.00 \mathrm{~kg}3.00 kg  mass is located at  x=0.0 cm\mathrm{x}=0.0 \mathrm{~cm}x=0.0 cm  and  y=\mathrm{y}=y=   2.0 cm2.0 \mathrm{~cm}2.0 cm . A  4.00 kg4.00 \mathrm{~kg}4.00 kg  mass is located at  x=3.0 cmx=3.0 \mathrm{~cm}x=3.0 cm  and  y=−3.0 cmy=-3.0 \mathrm{~cm}y=−3.0 cm . Where is the location of the center of mass?

Accepted Answer

A)    (3.5 cm,−0.6 cm) (3.5 \mathrm{~cm},-0.6 \mathrm{~cm}) (3.5 cm,−0.6 cm)  
B)    (0.60 cm,−1.8 cm) (0.60 \mathrm{~cm},-1.8 \mathrm{~cm}) (0.60 cm,−1.8 cm)  
C)    (1.8 cm,0.60 cm) (1.8 \mathrm{~cm}, 0.60 \mathrm{~cm}) (1.8 cm,0.60 cm)  
D)    (1.8 cm,−0.60 cm) (1.8 \mathrm{~cm},-0.60 \mathrm{~cm}) (1.8 cm,−0.60 cm)  
E)    (1.8 cm,1.6 cm) (1.8 \mathrm{~cm}, 1.6 \mathrm{~cm}) (1.8 cm,1.6 cm) F) A) and E)
G) A) and D)

Question 19

A  4.00 kg4.00 \mathrm{~kg}4.00 kg  object is moving at  3.00 m/s3.00 \mathrm{~m} / \mathrm{s}3.00 m/s  WEST. It catches up to and strikes a  6.00 kg6.00 \mathrm{~kg}6.00 kg  that is moving WEST at  2.00 m/s2.00 \mathrm{~m} / \mathrm{s}2.00 m/s . The objects undergo an elastic collision in the EAST-WEST direction. The velocity of the 4.00  kg\mathrm{kg}kg  object after the collision is

Accepted Answer

A)    1.80 m/s1.80 \mathrm{~m} / \mathrm{s}1.80 m/s  EAST.
B)    1.80 m/s1.80 \mathrm{~m} / \mathrm{s}1.80 m/s  WEST.
C)    1.00 m/s1.00 \mathrm{~m} / \mathrm{s}1.00 m/s  WEST.
D)    2.80 m/s2.80 \mathrm{~m} / \mathrm{s}2.80 m/s  WEST.
E)    2.80 m/s2.80 \mathrm{~m} / \mathrm{s}2.80 m/s  EAST. F) All of the above
G) A) and E)

Question 20

A  4.00 kg4.00 \mathrm{~kg}4.00 kg  ball is moving at  2.00 m/s2.00 \mathrm{~m} / \mathrm{s}2.00 m/s  to the WEST and a  6.00 kg6.00 \mathrm{~kg}6.00 kg  ball is moving at  2.00 m/s2.00 \mathrm{~m} / \mathrm{s}2.00 m/s  to the NORTH. The total momentum of the system is

Accepted Answer

A)    21.6 kg m/s21.6 \mathrm{~kg} \mathrm{~m} / \mathrm{s}21.6 kg m/s  at an angle of 17.7 degrees NORTH of WEST.
B)    21.6 kg m/s21.6 \mathrm{~kg} \mathrm{~m} / \mathrm{s}21.6 kg m/s  at an angle of 56.3 degrees NORTH of WEST.
C)    21.6 kg m/s21.6 \mathrm{~kg} \mathrm{~m} / \mathrm{s}21.6 kg m/s  at an angle of 45.2 degrees SOUTH of WEST.
D)    14.4 kg m/s14.4 \mathrm{~kg} \mathrm{~m} / \mathrm{s}14.4 kg m/s  at an angle of 45.2 degrees SOUTH of WEST.
E)    14.4 kg m/s14.4 \mathrm{~kg} \mathrm{~m} / \mathrm{s}14.4 kg m/s  at an angle of 56.3 degrees NORTH of WEST. F) A) and B)
G) C) and E)

Exam 7: Linear Momentum

Correct Answer
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Correct Answer
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An $1800 \mathrm{~kg}$ car traveling at $35.0 \mathrm{~m} / \mathrm{s}$ strikes a wall. If the car comes to rest in 0.500 seconds, then the magnitude of the average force of the wall on the car is

Correct Answer
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Two objects of equal mass and velocity hit a wall. They both rebound with the same velocity in the opposite direction. Both objects experience the same momentum change but one experiences twice the average force as the other. Which of the following statements is true?

Correct Answer
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A $4.00 \mathrm{~kg}$ ball is moving at $3.00 \mathrm{~m} / \mathrm{s}$ to the NORTH and a $5.00 \mathrm{~kg}$ ball is moving at $2.00 \mathrm{~m} / \mathrm{s}$ to the NORTHEAST. The total momentum of the system is

Correct Answer
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A $4.00 \mathrm{~kg}$ object is moving at $5.00 \mathrm{~m} / \mathrm{s}$ NORTH. It strikes a $6.00 \mathrm{~kg}$ object that is moving WEST at 2.00 $\mathrm{m} / \mathrm{s}$ . The objects undergo a perfectly inelastic (stick together) collision. The kinetic energy lost in the collision is

Correct Answer
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A $5.00 \mathrm{~kg}$ ball is moving at $4.0 \mathrm{~m} / \mathrm{s}$ to the right and a $6.00 \mathrm{~kg}$ ball is moving at $3.00 \mathrm{~m} / \mathrm{s}$ to the left. The total momentum of the system is

Correct Answer
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A $30.00 \mathrm{~kg}$ mass falls from a height of $2.000 \mathrm{~m}$ . The magnitude of the momentum of the mass just before it hits the ground is

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A $4.00 \mathrm{~kg}$ ball is moving at $4.0 \mathrm{~m} / \mathrm{s}$ to the right and a $6.00 \mathrm{~kg}$ ball is moving at $3.00 \mathrm{~m} / \mathrm{s}$ to the left. The total momentum of the system is

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D

If a $5.00 \mathrm{~kg}$ mass is moving EAST at $10.0 \mathrm{~m} / \mathrm{s}$ and a $15.0 \mathrm{~kg}$ mass is moving WEST at $10 \mathrm{~m} / \mathrm{s}$ , what is the velocity of the center of mass of the pair?

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B

A $4.0 \mathrm{~kg}$ ball is traveling at $5.0 \mathrm{~m} / \mathrm{s}$ to the right and strikes a wall. The ball bounces off the wall with a velocity of $4.0 \mathrm{~m} / \mathrm{s}$ to the left. The change in momentum of the ball is

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D

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A $2.0 \mathrm{~kg}$ ball is moving at $4.0 \mathrm{~m} / \mathrm{s}$ WEST. The momentum of the ball is

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An apple and an orange are connected by a straw of negligible mass. If the centers of the fruits are $26 \mathrm{~cm}$ apart and the center of mass of the pair is $11 \mathrm{~cm}$ from the apple, what is the ratio of $\mathrm{m}_{\text {apple }}$ to $\mathrm{m}_{\text {orange }}$ ?

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A $30.0 \mathrm{~g}$ mass is located at the origin. Where must a mass of $10.0 \mathrm{~g}$ be located if the coordinates of the center of mass are $(0.00 \mathrm{~cm}, 10.0 \mathrm{~cm})$ ?

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A $4.00 \mathrm{~kg}$ ball is moving at $2.00 \mathrm{~m} / \mathrm{s}$ to the WEST and a $6.00 \mathrm{~kg}$ ball is moving at $2.00 \mathrm{~m} / \mathrm{s}$ to the NORTH. The total momentum of the system is

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Exam 7: Linear Momentum

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An 1800 kg1800 \mathrm{~kg}1800 kg car traveling at 35.0 m/s35.0 \mathrm{~m} / \mathrm{s}35.0 m/s strikes a wall. If the car comes to rest in 0.500 seconds, then the magnitude of the average force of the wall on the car is

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Two objects of equal mass and velocity hit a wall. They both rebound with the same velocity in the opposite direction. Both objects experience the same momentum change but one experiences twice the average force as the other. Which of the following statements is true?

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A 4.00 kg4.00 \mathrm{~kg}4.00 kg ball is moving at 3.00 m/s3.00 \mathrm{~m} / \mathrm{s}3.00 m/s to the NORTH and a 5.00 kg5.00 \mathrm{~kg}5.00 kg ball is moving at 2.00 m/s2.00 \mathrm{~m} / \mathrm{s}2.00 m/s to the NORTHEAST. The total momentum of the system is

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A 5.00 kg5.00 \mathrm{~kg}5.00 kg ball is moving at 4.0 m/s4.0 \mathrm{~m} / \mathrm{s}4.0 m/s to the right and a 6.00 kg6.00 \mathrm{~kg}6.00 kg ball is moving at 3.00 m/s3.00 \mathrm{~m} / \mathrm{s}3.00 m/s to the left. The total momentum of the system is

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A 30.00 kg30.00 \mathrm{~kg}30.00 kg mass falls from a height of 2.000 m2.000 \mathrm{~m}2.000 m . The magnitude of the momentum of the mass just before it hits the ground is

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A 4.00 kg4.00 \mathrm{~kg}4.00 kg ball is moving at 4.0 m/s4.0 \mathrm{~m} / \mathrm{s}4.0 m/s to the right and a 6.00 kg6.00 \mathrm{~kg}6.00 kg ball is moving at 3.00 m/s3.00 \mathrm{~m} / \mathrm{s}3.00 m/s to the left. The total momentum of the system is

Correct AnswerverifiedD

If a 5.00 kg5.00 \mathrm{~kg}5.00 kg mass is moving EAST at 10.0 m/s10.0 \mathrm{~m} / \mathrm{s}10.0 m/s and a 15.0 kg15.0 \mathrm{~kg}15.0 kg mass is moving WEST at 10 m/s10 \mathrm{~m} / \mathrm{s}10 m/s , what is the velocity of the center of mass of the pair?

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A 4.0 kg4.0 \mathrm{~kg}4.0 kg ball is traveling at 5.0 m/s5.0 \mathrm{~m} / \mathrm{s}5.0 m/s to the right and strikes a wall. The ball bounces off the wall with a velocity of 4.0 m/s4.0 \mathrm{~m} / \mathrm{s}4.0 m/s to the left. The change in momentum of the ball is

Correct AnswerverifiedD

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A 2.0 kg2.0 \mathrm{~kg}2.0 kg ball is moving at 4.0 m/s4.0 \mathrm{~m} / \mathrm{s}4.0 m/s WEST. The momentum of the ball is

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A 30.0 g30.0 \mathrm{~g}30.0 g mass is located at the origin. Where must a mass of 10.0 g10.0 \mathrm{~g}10.0 g be located if the coordinates of the center of mass are (0.00 cm,10.0 cm) (0.00 \mathrm{~cm}, 10.0 \mathrm{~cm}) (0.00 cm,10.0 cm) ?

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A 4.00 kg4.00 \mathrm{~kg}4.00 kg ball is moving at 2.00 m/s2.00 \mathrm{~m} / \mathrm{s}2.00 m/s to the WEST and a 6.00 kg6.00 \mathrm{~kg}6.00 kg ball is moving at 2.00 m/s2.00 \mathrm{~m} / \mathrm{s}2.00 m/s to the NORTH. The total momentum of the system is

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An $1800 \mathrm{~kg}$ car traveling at $35.0 \mathrm{~m} / \mathrm{s}$ strikes a wall. If the car comes to rest in 0.500 seconds, then the magnitude of the average force of the wall on the car is

Correct Answer
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Correct Answer
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A $4.00 \mathrm{~kg}$ ball is moving at $3.00 \mathrm{~m} / \mathrm{s}$ to the NORTH and a $5.00 \mathrm{~kg}$ ball is moving at $2.00 \mathrm{~m} / \mathrm{s}$ to the NORTHEAST. The total momentum of the system is

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Correct Answer
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A $5.00 \mathrm{~kg}$ ball is moving at $4.0 \mathrm{~m} / \mathrm{s}$ to the right and a $6.00 \mathrm{~kg}$ ball is moving at $3.00 \mathrm{~m} / \mathrm{s}$ to the left. The total momentum of the system is

Correct Answer
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Correct Answer
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A $30.00 \mathrm{~kg}$ mass falls from a height of $2.000 \mathrm{~m}$ . The magnitude of the momentum of the mass just before it hits the ground is

Correct Answer
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A $4.00 \mathrm{~kg}$ ball is moving at $4.0 \mathrm{~m} / \mathrm{s}$ to the right and a $6.00 \mathrm{~kg}$ ball is moving at $3.00 \mathrm{~m} / \mathrm{s}$ to the left. The total momentum of the system is

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D

If a $5.00 \mathrm{~kg}$ mass is moving EAST at $10.0 \mathrm{~m} / \mathrm{s}$ and a $15.0 \mathrm{~kg}$ mass is moving WEST at $10 \mathrm{~m} / \mathrm{s}$ , what is the velocity of the center of mass of the pair?

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B

A $4.0 \mathrm{~kg}$ ball is traveling at $5.0 \mathrm{~m} / \mathrm{s}$ to the right and strikes a wall. The ball bounces off the wall with a velocity of $4.0 \mathrm{~m} / \mathrm{s}$ to the left. The change in momentum of the ball is

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D

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A $2.0 \mathrm{~kg}$ ball is moving at $4.0 \mathrm{~m} / \mathrm{s}$ WEST. The momentum of the ball is

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Correct Answer
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Correct Answer
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A $30.0 \mathrm{~g}$ mass is located at the origin. Where must a mass of $10.0 \mathrm{~g}$ be located if the coordinates of the center of mass are $(0.00 \mathrm{~cm}, 10.0 \mathrm{~cm})$ ?

Correct Answer
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Correct Answer
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Correct Answer
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A $4.00 \mathrm{~kg}$ ball is moving at $2.00 \mathrm{~m} / \mathrm{s}$ to the WEST and a $6.00 \mathrm{~kg}$ ball is moving at $2.00 \mathrm{~m} / \mathrm{s}$ to the NORTH. The total momentum of the system is

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