Question 1

Multiple-object systems with friction: A 4.00-kg box sits atop a 10.0-kg box on a horizontal table. The coefficient of kinetic friction between the two boxes and between the lower box and the table is 0.600, while the coefficient of static friction between these same surfaces is 0.800. A horizontal pull to the right is exerted on the lower box, as shown in the figure, and the boxes move together. What is the friction force on the UPPER box?

Accepted Answer

A)   19.3 N to the right
B)   19.3 N to the left
C)   23.5 N to the right
D)   31.4 N to the right
E)   31.4 N to the leftF) A) and B)
G) D) and E)

Question 2

Multiple-object systems without friction: Two weights are connected by a massless wire and pulled upward with a constant speed of 1.50 m/s by a vertical pull P. The tension in the wire is T (see figure) . Which one of the following relationships between T and P must be true?  P B)  T = P C)  P + T = 125 N D)  P = T + 25 N E)  P = T + 100 N" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   T > P
B)   T = P
C)   P + T = 125 N
D)   P = T + 25 N
E)   P = T + 100 NF) C) and D)
G) B) and C)

Question 3

Equilibrium: A system of blocks and a frictionless pulley is shown in the figure. Block A has a mass of 2.0 kg and is on a rough horizontal surface for which μs = 0.40 between the surface and block A. The rope pulls horizontally on block A. Block C has a mass of 1.0 kg. An external force P = 23.0 N, applied vertically to block A, maintains the system at rest as shown in the figure. What is the friction force on block A? s = 0.40 between the surface and block A. The rope pulls horizontally on block A. Block C has a mass of 1.0 kg. An external force P = 23.0 N, applied vertically to block A, maintains the system at rest as shown in the figure. What is the friction force on block A?   A)  6.3 N B)  6.9 N C)  7.5 N D)  5.7 N E)  5.1 N" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   6.3 N
B)   6.9 N
C)   7.5 N
D)   5.7 N
E)   5.1 NF) B) and E)
G) A) and B)

Question 4

Air resistance: An 80.0-kg object is falling and experiences a drag force due to air resistance. The magnitude of this drag force depends on its speed, v, and obeys the equation Fdrag = (12.0 N ∙ s/m) v + (4.00 N ∙ s2/m2) v2. What is the terminal speed of this object?

Accepted Answer

A)   6.45 m/s
B)   72.2 m/s
C)   34.2 m/s
D)   12.6 m/s
E)   47.3 m/sF) A) and E)
G) A) and D)

Question 5

Banked curves: A 600-kg car is going around a banked curve with a radius of 110 m at a speed of 24.5 m/s. What is the appropriate banking angle so that the car stays on its path without the assistance of friction?

Accepted Answer

A)   29.1°
B)   13.5°
C)   33.8°
D)   56.2°
E)   60.9°F) A) and D)
G) B) and C)

Question 6

Slanted surfaces with friction: A 50.0-kg block is being pulled up a 16.0° slope by a force of 250 N which is parallel to the slope. The coefficient of kinetic friction between the block and the slope is 0.200. What is the magnitude of the acceleration of the block?

Accepted Answer

A)   0.528 m/ 
B)   0.158 m/ 
C)   0.412 m/ 
D)   0.983 m/ 
E)   0.260 m/ F) A) and B)
G) C) and D)

Question 7

General questions: You are seated in a bus and notice that a hand strap that is hanging from the ceiling hangs away from the vertical in the backward direction. From this observation, you can conclude that

Accepted Answer

A)   the velocity of the bus is forward.
B)   the velocity of the bus is backward.
C)   You cannot conclude anything about the direction of the velocity of the bus.D) A) and B)
E) None of the above

Question 8

Uniform circular motion: A 23 kg mass is connected to a nail on a frictionless table by a massless string 1.3 m long. There is no appreciable friction between the nail and the string. If the tension in the string is 51 N while the mass moves in a uniform circle on the table, how long does it take for the mass to make one complete revolution?

Accepted Answer

A)   4.8 s
B)   3.8 s
C)   4.5 s
D)   5.2 sE) B) and C)
F) A) and C)

Question 9

Multiple-object systems without friction: Three objects are connected by massless wires over a massless frictionless pulley as shown in the figure. The tension in the wire connecting the 10.0-kg and 15.0-kg objects is measured to be 133 N. What is the mass M?

Accepted Answer

A)   8.33 kg
B)   33.9 kg
C)   35.0 kg
D)   52.8 kg
E)   95.0 kgF) B) and D)
G) C) and E)

Question 10

Friction: Jason takes off from rest across level water on his jet-powered skis. The combined mass of Jason and his skis is 75 kg (the mass of the fuel is negligible) . The skis have a thrust of 200 N and a coefficient of kinetic friction on water of 0.10. Unfortunately, the skis run out of fuel after only 67 s. How far has Jason traveled when he finally coasts to a stop?

Accepted Answer

A)   10,000 m
B)   7600 m
C)   5400 m
D)   3800 mE) A) and D)
F) C) and D)

Question 11

Friction: Kieran takes off from rest down a 50 m high, 10° slope on his jet-powered skis. The skis have a thrust of 280 N parallel to the surface of the slope. The combined mass of skis and Kieran is 50 kg (the fuel mass is negligible) . Kieran's speed at the bottom is 40 m/s. What is the coefficient of kinetic friction of his skis on snow?

Accepted Answer

A)   0.47
B)   0.58
C)   0.23
D)   0.29E) B) and C)
F) A) and C)

Question 12

Air resistance: A 1.20-kg ball is hanging from the end of a rope. The rope hangs at an angle 25.0° from the vertical when a 15.0 m/s horizontal wind is blowing. If the wind's force on the rope is negligible, what drag force does the wind exert on the ball?

Accepted Answer

A)   32.3 N
B)   24.1 N
C)   3.68 N
D)   5.48 N
E)   11.8 NF) C) and E)
G) A) and C)

Question 13

Equilibrium: A woman is straining to lift a large crate, without success because it is too heavy. We denote the forces on the crate as follows: P is the upward force the woman exerts on the crate, C is the vertical contact force exerted on the crate by the floor, and W is the weight of the crate. How are the magnitudes of these forces related while the woman is trying unsuccessfully to lift the crate?

Accepted Answer

A)   P + C = W
B)   P + C 
C)   P + C > W
D)   P = CE) A) and B)
F) A) and C)

Question 14

Newton's second law: A block is on a frictionless horizontal table, on earth. This block accelerates at 1.9 m/ 2. What is the weight of the block on the moon? A)  77 N B)  67 N C)  58 N D)  48 N E)  39 N" class="answers-bank-image d-inline" rel="preload" > when a 2. What is the weight of the block on the moon? A)  77 N B)  67 N C)  58 N D)  48 N E)  39 N" class="answers-bank-image d-inline" rel="preload" > horizontal force is applied to it. The block and table are then set up on the moon where the acceleration due to gravity is 1.62 m/s2. What is the weight of the block on the moon?

Accepted Answer

A)   77 N
B)   67 N
C)   58 N
D)   48 N
E)   39 NF) D) and E)
G) A) and B)

Question 15

Newton's second law: The graph in the figure shows the x component of the acceleration of a 2.4-kg object as a function of time (in ms).  (a) At what time(s) does the x component of the net force on the object reach its maximum magnitude, and what is that maximum magnitude?
(b) What is the x component of the net force on the object at time t = 0.0 ms and at t = 4.0 ms?

Accepted Answer

(a) At 3.0...

Question 16

Newton's second law: A block lies on a horizontal frictionless surface. A horizontal force of 100 N is applied to the block giving rise to an acceleration of 3.0 m/s2.
(a) Determine the mass of the block.
(b) Calculate the distance the block will travel if the force is applied for 10 s.
(c) Calculate the speed of the block after the force has been applied for 10 s

Accepted Answer

(a) 33 kg ...

Question 17

Friction: A 50.0-kg box rests on a horizontal surface. The coefficient of static friction between the box and the surface is 0.300 and the coefficient of kinetic friction is 0.200. What is the friction force on the box if
(a) a horizontal 140-N push is applied to it?
(b) a horizontal 175-N push is applied to it?

Accepted Answer

(a) 140 N ...

Question 18

General questions: You swing a bat and hit a heavy box with a force of 1500 N. The force the box exerts on the bat is

Accepted Answer

A)   exactly 1500 N only if the box does not move.
B)   exactly 1500 N whether or not the box moves.
C)   greater than 1500 N if the box moves.
D)   less than 1500 N if the box moves.
E)   greater than 1500 N if the bat bounces back.F) B) and C)
G) A) and D)

Question 19

Uniform circular motion: A ball of mass 5.0 kg is suspended by two wires from a horizontal arm that is attached to a vertical shaft, as shown in the figure. The shaft is in uniform rotation about its axis. The rate of rotation is adjusted until the tensions in the two wires are EQUAL. At that speed, the radial acceleration of the ball is closest to 2 B)  5.9 m/s2 C)  6.9 m/s2 D)  7.9 m/s2 E)  9.9 m/s2" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   4.9 m/s2
B)   5.9 m/s2
C)   6.9 m/s2
D)   7.9 m/s2
E)   9.9 m/s2F) A) and C)
G) C) and D)

Question 20

Friction: A packing crate rests on a horizontal surface. It is acted on by three horizontal forces: 600 N to the left, 200 N to the right, and friction. The weight of the crate is 400 N. If the 600-N force is removed, the resultant force acting on the crate is

Accepted Answer

A)   zero.
B)   200 N to the right.
C)   200 N to the left.
D)   400 N to the left.
E)   impossible to determine from the information given.F) None of the above
G) A) and C)

Exam 5: Applying Newtons Laws

Newton's second law: A block is on a frictionless horizontal table, on earth. This block accelerates at 1.9 m/ when a horizontal force is applied to it. The block and table are then set up on the moon where the acceleration due to gravity is 1.62 m/s². What is the weight of the block on the moon?

Correct Answer
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Air resistance: An 80.0-kg object is falling and experiences a drag force due to air resistance. The magnitude of this drag force depends on its speed, v, and obeys the equation F_drag = (12.0 N ∙ s/m) v + (4.00 N ∙ s²/m²) v². What is the terminal speed of this object?

Correct Answer
verified

Banked curves: A 600-kg car is going around a banked curve with a radius of 110 m at a speed of 24.5 m/s. What is the appropriate banking angle so that the car stays on its path without the assistance of friction?

Correct Answer
verified

Friction: A packing crate rests on a horizontal surface. It is acted on by three horizontal forces: 600 N to the left, 200 N to the right, and friction. The weight of the crate is 400 N. If the 600-N force is removed, the resultant force acting on the crate is

Correct Answer
verified

General questions: You are seated in a bus and notice that a hand strap that is hanging from the ceiling hangs away from the vertical in the backward direction. From this observation, you can conclude that

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Multiple-object systems without friction: Three objects are connected by massless wires over a massless frictionless pulley as shown in the figure. The tension in the wire connecting the 10.0-kg and 15.0-kg objects is measured to be 133 N. What is the mass M?

Correct Answer
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Correct Answer
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Correct Answer
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(a) 140 N ...
View Answer

Air resistance: A 1.20-kg ball is hanging from the end of a rope. The rope hangs at an angle 25.0° from the vertical when a 15.0 m/s horizontal wind is blowing. If the wind's force on the rope is negligible, what drag force does the wind exert on the ball?

Correct Answer
verified

Slanted surfaces with friction: A 50.0-kg block is being pulled up a 16.0° slope by a force of 250 N which is parallel to the slope. The coefficient of kinetic friction between the block and the slope is 0.200. What is the magnitude of the acceleration of the block?

Correct Answer
verified

General questions: You swing a bat and hit a heavy box with a force of 1500 N. The force the box exerts on the bat is

Correct Answer
verified

Correct Answer
verified

Multiple-object systems without friction: Two weights are connected by a massless wire and pulled upward with a constant speed of 1.50 m/s by a vertical pull P. The tension in the wire is T (see figure) . Which one of the following relationships between T and P must be true?

Correct Answer
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Correct Answer
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(a) 33 kg ...
View Answer

Correct Answer
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Correct Answer
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(a) At 3.0...
View Answer

Exam 5: Applying Newtons Laws

Newton's second law: A block is on a frictionless horizontal table, on earth. This block accelerates at 1.9 m/ when a horizontal force is applied to it. The block and table are then set up on the moon where the acceleration due to gravity is 1.62 m/s2. What is the weight of the block on the moon?

Correct AnswerverifiedShow Answer

Air resistance: An 80.0-kg object is falling and experiences a drag force due to air resistance. The magnitude of this drag force depends on its speed, v, and obeys the equation Fdrag = (12.0 N ∙ s/m) v + (4.00 N ∙ s2/m2) v2. What is the terminal speed of this object?

Correct AnswerverifiedShow Answer

Banked curves: A 600-kg car is going around a banked curve with a radius of 110 m at a speed of 24.5 m/s. What is the appropriate banking angle so that the car stays on its path without the assistance of friction?

Correct AnswerverifiedShow Answer

Friction: A packing crate rests on a horizontal surface. It is acted on by three horizontal forces: 600 N to the left, 200 N to the right, and friction. The weight of the crate is 400 N. If the 600-N force is removed, the resultant force acting on the crate is

Correct AnswerverifiedShow Answer

General questions: You are seated in a bus and notice that a hand strap that is hanging from the ceiling hangs away from the vertical in the backward direction. From this observation, you can conclude that

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Multiple-object systems without friction: Three objects are connected by massless wires over a massless frictionless pulley as shown in the figure. The tension in the wire connecting the 10.0-kg and 15.0-kg objects is measured to be 133 N. What is the mass M?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct Answerverified(a) 140 N ...View AnswerShow Answer

Air resistance: A 1.20-kg ball is hanging from the end of a rope. The rope hangs at an angle 25.0° from the vertical when a 15.0 m/s horizontal wind is blowing. If the wind's force on the rope is negligible, what drag force does the wind exert on the ball?

Correct AnswerverifiedShow Answer

Slanted surfaces with friction: A 50.0-kg block is being pulled up a 16.0° slope by a force of 250 N which is parallel to the slope. The coefficient of kinetic friction between the block and the slope is 0.200. What is the magnitude of the acceleration of the block?

Correct AnswerverifiedShow Answer

General questions: You swing a bat and hit a heavy box with a force of 1500 N. The force the box exerts on the bat is

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Multiple-object systems without friction: Two weights are connected by a massless wire and pulled upward with a constant speed of 1.50 m/s by a vertical pull P. The tension in the wire is T (see figure) . Which one of the following relationships between T and P must be true?

Correct AnswerverifiedShow Answer

Correct Answerverified(a) 33 kg ...View AnswerShow Answer

Correct AnswerverifiedShow Answer

Correct Answerverified(a) At 3.0...View AnswerShow Answer

Newton's second law: A block is on a frictionless horizontal table, on earth. This block accelerates at 1.9 m/ when a horizontal force is applied to it. The block and table are then set up on the moon where the acceleration due to gravity is 1.62 m/s². What is the weight of the block on the moon?

Correct Answer
verified

Air resistance: An 80.0-kg object is falling and experiences a drag force due to air resistance. The magnitude of this drag force depends on its speed, v, and obeys the equation F_drag = (12.0 N ∙ s/m) v + (4.00 N ∙ s²/m²) v². What is the terminal speed of this 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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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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(a) 140 N ...
View Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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(a) 33 kg ...
View Answer

Correct Answer
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Correct Answer
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(a) At 3.0...
View Answer