Question 1

A 1000-kg whale swims horizontally to the right at a speed of 6.0 m/s. It suddenly collides directly with a stationary seal of mass 200 kg. The seal grabs onto the whale and holds fast. What is the
Momentum of these two sea creatures just after their collision? You can neglect any drag effects of
The water during the collision.

Accepted Answer

A)    1200 kg⋅m/s1200 \mathrm {~kg} \cdot \mathrm { m } / \mathrm { s }1200 kg⋅m/s 
B)    7200 kg⋅m/s7200 \mathrm {~kg} \cdot \mathrm { m } / \mathrm { s }7200 kg⋅m/s 
C)    0.00 kg⋅m/s0.00 \mathrm {~kg} \cdot \mathrm { m } / \mathrm { s }0.00 kg⋅m/s 
D)    2000 kg⋅m/s2000 \mathrm {~kg} \cdot \mathrm { m } / \mathrm { s }2000 kg⋅m/s 
E)    6000 kg⋅m/s6000 \mathrm {~kg} \cdot \mathrm { m } / \mathrm { s }6000 kg⋅m/sF) A) and D)
G) A) and E)

Question 2

A 14-cm diameter champagne bottle rests on its side on top of a frictionless horizontal table. Suddenly, the cork pops and the bottle slides backward, covering a distance of  22.0 cm in  0.44 s. If the mass of the bottle is 500 times the mass of the cork, find the distance from the original position that the cork will land on the table. Neglect air resistance and assume that the cork is very small compared to the bottle.

Accepted Answer

A)    8.5 cm
B)    3000 cm
C)    85 m
D)    60 mE) All of the above
F) B) and C)

Question 3

A 600-kg car makes a  90∘90 ^ { \circ }90∘  turn. Its speed before the turn is  21.0 m/s and after the turn it is  24.0 m/s. What is the magnitude of the change in the car's momentum during the turn?

Accepted Answer

A)    22.2×103 kg⋅m/s22.2 	imes 10 ^ { 3 } \mathrm {~kg} \cdot \mathrm { m } / \mathrm { s }22.2×103 kg⋅m/s 
B)    12.0×103 kg⋅m/s12.0 	imes 10 ^ { 3 } \mathrm {~kg} \cdot \mathrm { m } / \mathrm { s }12.0×103 kg⋅m/s 
C)    19.1×103 kg⋅m/s19.1 	imes 10 ^ { 3 } \mathrm {~kg} \cdot \mathrm { m } / \mathrm { s }19.1×103 kg⋅m/s 
D)    10.2×103 kg⋅m/s10.2 	imes 10 ^ { 3 } \mathrm {~kg} \cdot \mathrm { m } / \mathrm { s }10.2×103 kg⋅m/s 
E)    9.55×103 kg⋅m/s9.55 	imes 10 ^ { 3 } \mathrm {~kg} \cdot \mathrm { m } / \mathrm { s }9.55×103 kg⋅m/sF) B) and D)
G) B) and E)

Question 4

A 900-kg car traveling  30.0∘30.0 ^ { \circ }30.0∘  south of east at  12.0 m/s suddenly collides with a 750-kg car traveling north at  17.0 m/s. The cars stick together after colliding. What is the speed of the wreckage just after the collision?

Accepted Answer

A)    25.0 m/s
B)    17.3 m/s
C)    12.2 m/s
D)    7.21 m/s
E)    20.4 m/s F) B) and C)
G) B) and D)

Question 5

A  100-g  ball falls from a window that is  12 m above ground level and experiences no significant air resistance as it falls. What is its momentum when it strikes the ground?

Accepted Answer

A)    3.3 kg . m/s
B)    4.8 kg . m/s
C)    1.5 kg . m/s
D)    2.4 kg . m/s
E)    1.8 kg . m/sF) B) and E)
G) B) and D)

Question 6

Three masses, 1.0 kg, 2.0 kg, and 3.0 kg, are located at (0.0 m, 0.0 m) , (1.0 m, 1.0 m) , and (2.0 m, -2.0 m) , respectively. What is the location of the center of mass (or center of gravity)  of this system?

Accepted Answer

A)   (-1.3 m, -0.67 m) 
B)   (1.3 m, -0.67 m) 
C)   (-1.3 m, 0.67 m) 
D)   (1.3 m, 0.67 m) E) C) and D)
F) B) and C) B

Question 7

As shown in the figure, a 60-cm length of uniform wire, of mass 60 g, is bent into a right triangle. What are the x and y coordinates of the center of mass (or center of gravity)  of this triangle?

Accepted Answer

A)    (10 cm, 3.0 cm)  
B)    (8.0 cm, 3.0 cm)  
C)    (9.0 cm, 4.0 cm)  
D)    (8.0 cm, 5.0 cm)  
E)    (10 cm, 5.0 cm)  F) C) and E)
G) B) and C) A

Question 8

As shown in the figure, a bullet of mass 0.010 kg moving horizontally suddenly strikes a block of wood of mass 1.5 kg that is suspended as a pendulum. The bullet lodges in the wood, and together
They swing upward a vertical distance of 0.40 m. The length of the string is 2.0 m. What was the
Speed of the bullet just before it struck the wooden block?

Accepted Answer

A)   250 m/s
B)   67 ms
C)   370 m/s
D)   650 m/s
E)   420 m/sF) A) and E)
G) C) and D)

Question 9

A  1200-kg ore cart is rolling at  10.8 m/s across a flat friction-free surface. A crane suddenly drops  858 kg of ore vertically into the cart. How fast does the cart move just after being loaded with the ore?

Accepted Answer

A)    4.20 m/s
B)    3.80 m/s
C)    5.70 m/s
D)    6.30 m/sE) All of the above
F) A) and D)

Question 10

A rocket explodes into two fragments, one 25 times heavier than the other. The magnitude of the momentum change of the lighter fragment is

Accepted Answer

A)   The same as the momentum change of the heavier fragment.
B)   25 times as great as the momentum change of the heavier fragment.
C)   1/4 as great as the momentum change of the heavier fragment.
D)   5 times as great as the momentum change of the heavier fragment.
E)   1/25 as great as the momentum change of the heavier fragment.F) A) and D)
G) C) and D)

Question 11

A 3.0-kg mass is located at (0.0 m, 8.0 m) , and a 1.0-kg mass is located at (12 m, 0.0 m) . You want to add a 4.0-kg mass so that the center of mass (or center of gravity)  of the three-mass system will
Be at the origin. What should be the coordinates of the 4.0-kg mass?

Accepted Answer

A)   (-12 m, -8.0 m) 
B)   (-6.0 m, -3.0 m) 
C)   (3.0 m, 6.0 m) 
D)   (-3.0 m, -6.0 m) E) C) and D)
F) A) and D)

Question 12

A car heading north suddenly collides at an intersection with a truck of the same mass heading east. If they lock together and travel at  28 m/s at  15∘15 ^ { \circ }15∘  north of east just after the collision, how fast was the car initially traveling?

Accepted Answer

A)    7 m/s
B)    28 m/s
C)    11 m/s
D)    14 m/s E) All of the above
F) A) and B)

Question 13

A steady horizontal force lasting for  2.1 s gives a  1.25 kg object an acceleration of  3.2 m/s23.2 \mathrm {~m} / \mathrm { s } ^ { 2 }3.2 m/s2  on a frictionless table. What impulse does this force give to the object?

Accepted Answer

A)    2.6 kg⋅m/s2.6 \mathrm {~kg} \cdot \mathrm { m } / \mathrm { s }2.6 kg⋅m/s 
B)    26 kg⋅m/s26 \mathrm {~kg} \cdot \mathrm { m } / \mathrm { s }26 kg⋅m/s 
C)    8.4 kg⋅m/s8.4 \mathrm {~kg} \cdot \mathrm { m } / \mathrm { s }8.4 kg⋅m/s 
D)    11 kg⋅m/s11 \mathrm {~kg} \cdot \mathrm { m } / \mathrm { s }11 kg⋅m/sE) A) and D)
F) All of the above

Question 14

A baseball pitcher is employing a ballistic pendulum to determine the speed of his fastball.
A 3.3-kg lump of clay is suspended from a cord 2.0 m long. When the pitcher throws his
fastball aimed directly at the clay, the ball suddenly becomes embedded in the clay and
the two swing up to a maximum height of 0.080 m. If the mass of the baseball is 0.21 kg,
find the speed of the pitched ball.

Accepted Answer

The answer of A baseball pitcher is employing a ballistic...

Question 15

Two vehicles approach a right angle intersection and then suddenly collide. After the collision, they become entangled. If their mass ratios were 1:4 and their respective speeds as they
Approached the intersection were both 13 m/s, find the magnitude and direction of the final
Velocity of the wreck.

Accepted Answer

A)    16 m/s  at  76∘76 ^ { \circ }76∘  with respect to the original direction of the lighter car
B)    26 m/s  at  76∘76 ^ { \circ }76∘  with respect to the original direction of the lighter car
C)    16 m/s at  14∘14 ^ { \circ }14∘  with respect to the original direction of the lighter car
D)    11 m/s at  14∘14 ^ { \circ }14∘  with respect to the original direction of the lighter car
E)    11 m/s  at  76∘76 ^ { \circ }76∘  with respect to the original direction of the lighter car F) None of the above
G) A) and C)

Question 16

Consider the sun and its largest planet Jupiter. On the line joining them, how far from the center of the sun is their center mass? Is it within or outside the sun? (Jupiter-sun distance is $778 \times 10 ^ { 6 }$
km , diameter of the sun is $1.4 \times 10 ^ { 6 } \mathrm {~km}$
the sun is 1000 times as massive as Jupiter)

Accepted Answer

<img  loading="lazy" src="/assets/images/blured-textbook.svg" class="d-inline m-1" alt="blured image" width="139" height="30"> from the center of ...

Question 17

Identical forces act for the same length of time on two different objects. The magnitude of the change in momentum of the lighter object is

Accepted Answer

A)   exactly equal to the magnitude of the change in momentum of the larger mass.
B)   smaller than the magnitude of the change in momentum of the larger mass, but not zero.
C)   zero.
D)   larger than the magnitude of the change in momentum of the larger mass.
E)   There is not enough information to answer the question.F) A) and C)
G) A) and B) A

Question 18

An egg falls from a bird's nest in a tree and feels no effects due to the air. As it falls,

Accepted Answer

A)   only its momentum is conserved.
B)   both its kinetic energy and its momentum are conserved.
C)   both its mechanical energy and its momentum are conserved.
D)   only its mechanical energy is conserved.
E)   only its kinetic energy is conserved.F) A) and C)
G) A) and B)

Question 19

A  0.140-kg  baseball is dropped from rest from a height of  2.20 m above the ground and experiences negligible air resistance as it falls. It rebounds to a height of  1.60 m. What change in the ball's momentum occurs as it rebounds from the ground?

Accepted Answer

A)    0.350 kg⋅m/s upwards 0.350 \mathrm {~kg} \cdot \mathrm { m } / \mathrm { s } 	ext { upwards }0.350 kg⋅m/s upwards  
B)    0.117 kg⋅m/s upwards 0.117 \mathrm {~kg} \cdot \mathrm { m } / \mathrm { s } 	ext { upwards }0.117 kg⋅m/s upwards  
C)    0.350 kg⋅m/s downwards 0.350 \mathrm {~kg} \cdot \mathrm { m } / \mathrm { s } 	ext { downwards }0.350 kg⋅m/s downwards  
D)    0.117 kg⋅m/s downwards 0.117 \mathrm {~kg} \cdot \mathrm { m } / \mathrm { s } 	ext { downwards }0.117 kg⋅m/s downwards  
E)    1.70kq⋅m/s upwards 1.70 \mathrm { kq } \cdot \mathrm { m } / \mathrm { s } 	ext { upwards }1.70kq⋅m/s upwards F) A) and E)
G) A) and D)

Question 20

A 0.24 kg blob of clay is thrown at a wall with an initial horizontal velocity of 16 m/s. If the clay comes to a stop in 91 ms, what is the average horizontal force on the clay due to the wall?

Accepted Answer

A)   35 N
B)   42 N
C)   51 N
D)   26 NE) A) and B)
F) C) and D)

Exam 7: Linear Momentum

Correct Answer
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Correct Answer
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A 600-kg car makes a $90 ^ { \circ }$ turn. Its speed before the turn is 21.0 m/s and after the turn it is 24.0 m/s. What is the magnitude of the change in the car's momentum during the turn?

Correct Answer
verified

A 900-kg car traveling $30.0 ^ { \circ }$ south of east at 12.0 m/s suddenly collides with a 750-kg car traveling north at 17.0 m/s. The cars stick together after colliding. What is the speed of the wreckage just after the collision?

Correct Answer
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A 100-g ball falls from a window that is 12 m above ground level and experiences no significant air resistance as it falls. What is its momentum when it strikes the ground?

Correct Answer
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Three masses, 1.0 kg, 2.0 kg, and 3.0 kg, are located at (0.0 m, 0.0 m) , (1.0 m, 1.0 m) , and (2.0 m, -2.0 m) , respectively. What is the location of the center of mass (or center of gravity) of this system?

Correct Answer
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B

As shown in the figure, a 60-cm length of uniform wire, of mass 60 g, is bent into a right triangle. What are the x and y coordinates of the center of mass (or center of gravity) of this triangle?

Correct Answer
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A

Correct Answer
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A 1200-kg ore cart is rolling at 10.8 m/s across a flat friction-free surface. A crane suddenly drops 858 kg of ore vertically into the cart. How fast does the cart move just after being loaded with the ore?

Correct Answer
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A rocket explodes into two fragments, one 25 times heavier than the other. The magnitude of the momentum change of the lighter fragment is

Correct Answer
verified

A 3.0-kg mass is located at (0.0 m, 8.0 m) , and a 1.0-kg mass is located at (12 m, 0.0 m) . You want to add a 4.0-kg mass so that the center of mass (or center of gravity) of the three-mass system will Be at the origin. What should be the coordinates of the 4.0-kg mass?

Correct Answer
verified

A car heading north suddenly collides at an intersection with a truck of the same mass heading east. If they lock together and travel at 28 m/s at $15 ^ { \circ }$ north of east just after the collision, how fast was the car initially traveling?

Correct Answer
verified

A steady horizontal force lasting for 2.1 s gives a 1.25 kg object an acceleration of $3.2 \mathrm {~m} / \mathrm { s } ^ { 2 }$ on a frictionless table. What impulse does this force give to the object?

Correct Answer
verified

Correct Answer
verified

Two vehicles approach a right angle intersection and then suddenly collide. After the collision, they become entangled. If their mass ratios were 1:4 and their respective speeds as they Approached the intersection were both 13 m/s, find the magnitude and direction of the final Velocity of the wreck.

Correct Answer
verified

Correct Answer
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from the center of ...
View Answer

Identical forces act for the same length of time on two different objects. The magnitude of the change in momentum of the lighter object is

Correct Answer
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A

An egg falls from a bird's nest in a tree and feels no effects due to the air. As it falls,

Correct Answer
verified

A 0.140-kg baseball is dropped from rest from a height of 2.20 m above the ground and experiences negligible air resistance as it falls. It rebounds to a height of 1.60 m. What change in the ball's momentum occurs as it rebounds from the ground?

Correct Answer
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A 0.24 kg blob of clay is thrown at a wall with an initial horizontal velocity of 16 m/s. If the clay comes to a stop in 91 ms, what is the average horizontal force on the clay due to the wall?

Correct Answer
verified

Exam 7: Linear Momentum

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A 600-kg car makes a 90∘90 ^ { \circ }90∘ turn. Its speed before the turn is 21.0 m/s and after the turn it is 24.0 m/s. What is the magnitude of the change in the car's momentum during the turn?

Correct AnswerverifiedShow Answer

A 900-kg car traveling 30.0∘30.0 ^ { \circ }30.0∘ south of east at 12.0 m/s suddenly collides with a 750-kg car traveling north at 17.0 m/s. The cars stick together after colliding. What is the speed of the wreckage just after the collision?

Correct AnswerverifiedShow Answer

A 100-g ball falls from a window that is 12 m above ground level and experiences no significant air resistance as it falls. What is its momentum when it strikes the ground?

Correct AnswerverifiedShow Answer

Three masses, 1.0 kg, 2.0 kg, and 3.0 kg, are located at (0.0 m, 0.0 m) , (1.0 m, 1.0 m) , and (2.0 m, -2.0 m) , respectively. What is the location of the center of mass (or center of gravity) of this system?

Correct AnswerverifiedB

As shown in the figure, a 60-cm length of uniform wire, of mass 60 g, is bent into a right triangle. What are the x and y coordinates of the center of mass (or center of gravity) of this triangle?

Correct AnswerverifiedA

Correct AnswerverifiedShow Answer

A 1200-kg ore cart is rolling at 10.8 m/s across a flat friction-free surface. A crane suddenly drops 858 kg of ore vertically into the cart. How fast does the cart move just after being loaded with the ore?

Correct AnswerverifiedShow Answer

A rocket explodes into two fragments, one 25 times heavier than the other. The magnitude of the momentum change of the lighter fragment is

Correct AnswerverifiedShow Answer

A 3.0-kg mass is located at (0.0 m, 8.0 m) , and a 1.0-kg mass is located at (12 m, 0.0 m) . You want to add a 4.0-kg mass so that the center of mass (or center of gravity) of the three-mass system will Be at the origin. What should be the coordinates of the 4.0-kg mass?

Correct AnswerverifiedShow Answer

A car heading north suddenly collides at an intersection with a truck of the same mass heading east. If they lock together and travel at 28 m/s at 15∘15 ^ { \circ }15∘ north of east just after the collision, how fast was the car initially traveling?

Correct AnswerverifiedShow Answer

A steady horizontal force lasting for 2.1 s gives a 1.25 kg object an acceleration of 3.2 m/s23.2 \mathrm {~m} / \mathrm { s } ^ { 2 }3.2 m/s2 on a frictionless table. What impulse does this force give to the object?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct Answerverified from the center of ...View AnswerShow Answer

Identical forces act for the same length of time on two different objects. The magnitude of the change in momentum of the lighter object is

Correct AnswerverifiedA

An egg falls from a bird's nest in a tree and feels no effects due to the air. As it falls,

Correct AnswerverifiedShow Answer

A 0.140-kg baseball is dropped from rest from a height of 2.20 m above the ground and experiences negligible air resistance as it falls. It rebounds to a height of 1.60 m. What change in the ball's momentum occurs as it rebounds from the ground?

Correct AnswerverifiedShow Answer

A 0.24 kg blob of clay is thrown at a wall with an initial horizontal velocity of 16 m/s. If the clay comes to a stop in 91 ms, what is the average horizontal force on the clay due to the wall?

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
verified

A 600-kg car makes a $90 ^ { \circ }$ turn. Its speed before the turn is 21.0 m/s and after the turn it is 24.0 m/s. What is the magnitude of the change in the car's momentum during the turn?

Correct Answer
verified

A 900-kg car traveling $30.0 ^ { \circ }$ south of east at 12.0 m/s suddenly collides with a 750-kg car traveling north at 17.0 m/s. The cars stick together after colliding. What is the speed of the wreckage just after the collision?

Correct Answer
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Correct Answer
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Correct Answer
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B

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A

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Correct Answer
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Correct Answer
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Correct Answer
verified

A car heading north suddenly collides at an intersection with a truck of the same mass heading east. If they lock together and travel at 28 m/s at $15 ^ { \circ }$ north of east just after the collision, how fast was the car initially traveling?

Correct Answer
verified

A steady horizontal force lasting for 2.1 s gives a 1.25 kg object an acceleration of $3.2 \mathrm {~m} / \mathrm { s } ^ { 2 }$ on a frictionless table. What impulse does this force give to the object?

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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from the center of ...
View Answer

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A

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