Question 1

A roller-coaster car has a mass of 500 kg when fully loaded with passengers. The car passes over a hill of radius 15 m, as shown. At the top of the hill, the car has a speed of 8.0 m/s. What is the force of the track on the car at the top of the hill?

Accepted Answer

A)  7.0 kN up
B)  7.0 kN down
C)  2.8 kN down
D)  2.8 kN up
E)  5.6 kN downF) A) and D)
G) B) and C)

Question 2

A car travels around an unbanked highway curve (radius 0.15 km)  at a constant speed of 25 m/s. What is the magnitude of the resultant force acting on the driver, who weighs 0.80 kN?

Accepted Answer

A)  0.87 kN
B)  0.34 kN
C)  0.80 kN
D)  0.00 kN
E)  0.67 kNF) A) and B)
G) B) and E)

Question 3

Frank says that if you release the string when swinging a ball in a horizontal circle, the ball flies out in the radial direction defined by the string at the instant you release the ball. John says that it flies out along a tangent line perpendicular to the string, and that it then drops straight down to the ground. Which one, if either, is correct?

Accepted Answer

A)  Frank, because the centrifugal force is no longer counteracted by the string.
B)  Frank, because balls naturally fly straight out.
C)  John, because there is no centrifugal force.
D)  John, because balls fall straight down when released.
E)  Neither, because although there is no centrifugal force, and the ball's velocity is tangent to the circle at the instant of release, the ball then follows a parabolic trajectory.F) None of the above
G) C) and E)

Question 4

A 1.8-kg block is projected up a rough 10° inclined plane. As the block slides up the incline, its acceleration is 3.8 m/s2 down the incline. What is the magnitude of the force of friction acting on the block?

Accepted Answer

A)  5.0 N
B)  3.8 N
C)  4.2 N
D)  4.6 N
E)  6.5 NF) A) and E)
G) A) and D)

Question 5

An object attached to the end of a string swings in a vertical circle (R = 1.2 m) , as shown. At an instant when θ = 30°, the speed of the object is 5.1 m/s and the tension in the string has a magnitude of 20 N. What is the mass of the object?

Accepted Answer

A)  2.0 kg
B)  1.5 kg
C)  1.8 kg
D)  1.2 kg
E)  0.80 kgF) A) and B)
G) A) and C)

Question 6

A small dense object is suspended from the rear view mirror in a car by a lightweight fiber. As the car is accelerating at 1.90 m/s2, what angle does the string make with the vertical?

Accepted Answer

Question 7

A 2.0-kg block slides on a rough horizontal surface. A force (P = 6.0 N)  is applied to the block as shown. The magnitude of the block's acceleration is 1.2 m/s2. What is the magnitude of the force of friction acting on the block? 2. What is the magnitude of the force of friction acting on the block?   A) 2.0 N B) 1.4 N C) 1.6 N D) 2.8 N E) 3.4 N" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  2.0 N
B)  1.4 N
C)  1.6 N
D)  2.8 N
E)  3.4 NF) C) and D)
G) None of the above

Question 8

A car enters a level, unbanked semi-circular hairpin turn of 300 m radius at a speed of 40 m/s. The coefficient of friction between the tires and the road is μ = 0.25. If the car maintains a constant speed of 40 m/s, it will

Accepted Answer

A)  attempt to dig into the road surface.
B)  tend to veer toward the center of the semicircle.
C)  arrive safely at the end of the semicircle.
D)  tend to veer toward the outside of the circle.
E)  veer toward the center for the first quarter-circle, then veer toward the outside for the second quarter-circle.F) A) and B)
G) D) and E)

Question 9

If a 20-kg object dropped in air has a terminal speed of 60 m/s, what was its acceleration at 30 m/s?

Accepted Answer

A)  9.80 m/s2
B)  7.35 m/s2
C)  4.90 m/s2
D)  2.45 m/s2
E)  More information is needed to answer this question.F) C) and E)
G) B) and D)

Question 10

A 50-kg child riding a Ferris wheel (radius = 10 m)  travels in a vertical circle. The wheel completes one revolution every 10 s. What is the magnitude of the force on the child by the seat at the highest point on the circular path?

Accepted Answer

A)  0.29 kN
B)  0.49 kN
C)  0.69 kN
D)  0.20 kN
E)  0.40 kNF) None of the above
G) A) and B)

Question 11

A boy on board a cruise ship drops a 30.0 g marble into the ocean. If the resistive force proportionality constant is 0.500 kg/s, what is the terminal speed of the marble in m/s?

Accepted Answer

A)  0.147
B)  0.294
C)  0.588
D)  1.18
E)  2.35F) B) and E)
G) A) and C)

Question 12

An iceboat is traveling in a circle on the ice. Halfway around the circle the sail and the steering mechanism fall off the boat. Which statement is correct?

Accepted Answer

A)  The boat will continue traveling in the circle because there is no friction.
B)  The boat will continue to travel in the circle because its velocity exerts a force on it.
C)  The boat will move off on a line tangent to the circle because there is no force on it.
D)  The boat will move off tangent to the circle because there is a force on it perpendicular to the boat directed to the outside of the circle.
E)  The boat will move off to the outside perpendicular to the tangent line since a force directed to the outside of the circle always acts on the boat.F) D) and E)
G) B) and C)

Question 13

A stunt pilot weighing 0.70 kN performs a vertical circular dive of radius 0.80 km. At the bottom of the dive, the pilot has a speed of 0.20 km/s which at that instant is not changing. What force does the plane exert on the pilot?

Accepted Answer

A)  3.6 kN up
B)  4.3 kN up
C)  2.9 kN down
D)  2.9 kN up
E)  5.8 kN downF) A) and C)
G) C) and E)

Question 14

A highway curve has a radius of 0.14 km and is unbanked. A car weighing 12 kN goes around the curve at a speed of 24 m/s without slipping. What is the magnitude of the horizontal force of the road on the car?

Accepted Answer

A)  12 kN
B)  17 kN
C)  13 kN
D)  5.0 kN
E)  49 kNF) A) and B)
G) C) and E)

Question 15

A 4.0-kg mass on the end of a string rotates in a circular motion on a horizontal frictionless table. The mass has a constant speed of 2.0 m/s and the radius of the circle is 0.80 m. What is the magnitude of the resultant force acting on the mass?

Accepted Answer

A)  39 N
B)  20 N
C)  44 N
D)  0 N
E)  30 NF) A) and E)
G) B) and E)

Question 16

A rock attached to a string swings in a vertical circle. Which free-body diagram could correctly describe the force(s)  on the rock when the string is in one possible horizontal position, where  is the normal force,  is weight, and  is tension?

Accepted Answer

A)   
B)   
C)   
D)   
E)   F) C) and E)
G) D) and E)

Question 17

A skydiver of 75-kg mass has a terminal velocity of 60 m/s. At what speed is the resistive force on the skydiver half that when at terminal speed?

Accepted Answer

A)  15 m/s
B)  49 m/s
C)  30 m/s
D)  42 m/s
E)  36 m/sF) B) and E)
G) B) and C)

Question 18

The equation below is the solution to a problem. ​  .
​
The best physical representation of this equation is

Accepted Answer

A)  a sphere of 2.00-kg mass under a 6.00-N tension when at the bottom of a vertical circle.
B)  a sphere of 2.00-kg mass under a 6.00-N tension when at the side of a vertical circle.
C)  a sphere of 2.00-kg mass under a 6.00-N tension when at the top of a vertical circle.
D)  a sphere of 2.00-kg mass at any point on a horizontal circle.
E)  a 2.00-kg gecko running on the ceiling with a speed of 8.00 m/s.F) C) and D)
G) A) and D)

Question 19

A 0.50-kg mass attached to the end of a string swings in a vertical circle (radius = 2.0 m) . When the mass is at the highest point of the circle the speed of the mass is 8.0 m/s. What is the magnitude of the force of the string on the mass at this position?

Accepted Answer

A)  21 N
B)  11 N
C)  16 N
D)  26 N
E)  36 NF) A) and D)
G) C) and D)

Question 20

A 0.50-kg mass attached to the end of a string swings in a vertical circle (radius = 2.0 m) . When the string is horizontal, the speed of the mass is 8.0 m/s. What is the magnitude of the force of the string on the mass at this position?

Accepted Answer

A)  16 N
B)  17 N
C)  21 N
D)  11 N
E)  25 NF) A) and D)
G) A) and C)

Exam 6: Applications of Newtons Laws of Motion

A skydiver of 75-kg mass has a terminal velocity of 60 m/s. At what speed is the resistive force on the skydiver half that when at terminal speed?

Correct Answer
verified

An iceboat is traveling in a circle on the ice. Halfway around the circle the sail and the steering mechanism fall off the boat. Which statement is correct?

Correct Answer
verified

A 1.8-kg block is projected up a rough 10° inclined plane. As the block slides up the incline, its acceleration is 3.8 m/s² down the incline. What is the magnitude of the force of friction acting on the block?

Correct Answer
verified

An object attached to the end of a string swings in a vertical circle (R = 1.2 m) , as shown. At an instant when θ = 30°, the speed of the object is 5.1 m/s and the tension in the string has a magnitude of 20 N. What is the mass of the object?

Correct Answer
verified

A 2.0-kg block slides on a rough horizontal surface. A force (P = 6.0 N) is applied to the block as shown. The magnitude of the block's acceleration is 1.2 m/s². What is the magnitude of the force of friction acting on the block?

Correct Answer
verified

The equation below is the solution to a problem. . The best physical representation of this equation is

Correct Answer
verified

A stunt pilot weighing 0.70 kN performs a vertical circular dive of radius 0.80 km. At the bottom of the dive, the pilot has a speed of 0.20 km/s which at that instant is not changing. What force does the plane exert on the pilot?

Correct Answer
verified

If a 20-kg object dropped in air has a terminal speed of 60 m/s, what was its acceleration at 30 m/s?

Correct Answer
verified

A rock attached to a string swings in a vertical circle. Which free-body diagram could correctly describe the force(s) on the rock when the string is in one possible horizontal position, where is the normal force, is weight, and is tension?

Correct Answer
verified

A 0.50-kg mass attached to the end of a string swings in a vertical circle (radius = 2.0 m) . When the string is horizontal, the speed of the mass is 8.0 m/s. What is the magnitude of the force of the string on the mass at this position?

Correct Answer
verified

A boy on board a cruise ship drops a 30.0 g marble into the ocean. If the resistive force proportionality constant is 0.500 kg/s, what is the terminal speed of the marble in m/s?

Correct Answer
verified

A highway curve has a radius of 0.14 km and is unbanked. A car weighing 12 kN goes around the curve at a speed of 24 m/s without slipping. What is the magnitude of the horizontal force of the road on the car?

Correct Answer
verified

A small dense object is suspended from the rear view mirror in a car by a lightweight fiber. As the car is accelerating at 1.90 m/s², what angle does the string make with the vertical?

Correct Answer
verified

A 50-kg child riding a Ferris wheel (radius = 10 m) travels in a vertical circle. The wheel completes one revolution every 10 s. What is the magnitude of the force on the child by the seat at the highest point on the circular path?

Correct Answer
verified

A roller-coaster car has a mass of 500 kg when fully loaded with passengers. The car passes over a hill of radius 15 m, as shown. At the top of the hill, the car has a speed of 8.0 m/s. What is the force of the track on the car at the top of the hill?

Correct Answer
verified

A 0.50-kg mass attached to the end of a string swings in a vertical circle (radius = 2.0 m) . When the mass is at the highest point of the circle the speed of the mass is 8.0 m/s. What is the magnitude of the force of the string on the mass at this position?

Correct Answer
verified

A 4.0-kg mass on the end of a string rotates in a circular motion on a horizontal frictionless table. The mass has a constant speed of 2.0 m/s and the radius of the circle is 0.80 m. What is the magnitude of the resultant force acting on the mass?

Correct Answer
verified

Correct Answer
verified

A car enters a level, unbanked semi-circular hairpin turn of 300 m radius at a speed of 40 m/s. The coefficient of friction between the tires and the road is μ = 0.25. If the car maintains a constant speed of 40 m/s, it will

Correct Answer
verified

A car travels around an unbanked highway curve (radius 0.15 km) at a constant speed of 25 m/s. What is the magnitude of the resultant force acting on the driver, who weighs 0.80 kN?

Correct Answer
verified

Exam 6: Applications of Newtons Laws of Motion

A skydiver of 75-kg mass has a terminal velocity of 60 m/s. At what speed is the resistive force on the skydiver half that when at terminal speed?

Correct AnswerverifiedShow Answer

An iceboat is traveling in a circle on the ice. Halfway around the circle the sail and the steering mechanism fall off the boat. Which statement is correct?

Correct AnswerverifiedShow Answer

A 1.8-kg block is projected up a rough 10° inclined plane. As the block slides up the incline, its acceleration is 3.8 m/s2 down the incline. What is the magnitude of the force of friction acting on the block?

Correct AnswerverifiedShow Answer

An object attached to the end of a string swings in a vertical circle (R = 1.2 m) , as shown. At an instant when θ = 30°, the speed of the object is 5.1 m/s and the tension in the string has a magnitude of 20 N. What is the mass of the object?

Correct AnswerverifiedShow Answer

A 2.0-kg block slides on a rough horizontal surface. A force (P = 6.0 N) is applied to the block as shown. The magnitude of the block's acceleration is 1.2 m/s2. What is the magnitude of the force of friction acting on the block?

Correct AnswerverifiedShow Answer

The equation below is the solution to a problem. ​ . ​ The best physical representation of this equation is

Correct AnswerverifiedShow Answer

A stunt pilot weighing 0.70 kN performs a vertical circular dive of radius 0.80 km. At the bottom of the dive, the pilot has a speed of 0.20 km/s which at that instant is not changing. What force does the plane exert on the pilot?

Correct AnswerverifiedShow Answer

If a 20-kg object dropped in air has a terminal speed of 60 m/s, what was its acceleration at 30 m/s?

Correct AnswerverifiedShow Answer

A rock attached to a string swings in a vertical circle. Which free-body diagram could correctly describe the force(s) on the rock when the string is in one possible horizontal position, where is the normal force, is weight, and is tension?

Correct AnswerverifiedShow Answer

A 0.50-kg mass attached to the end of a string swings in a vertical circle (radius = 2.0 m) . When the string is horizontal, the speed of the mass is 8.0 m/s. What is the magnitude of the force of the string on the mass at this position?

Correct AnswerverifiedShow Answer

A boy on board a cruise ship drops a 30.0 g marble into the ocean. If the resistive force proportionality constant is 0.500 kg/s, what is the terminal speed of the marble in m/s?

Correct AnswerverifiedShow Answer

A highway curve has a radius of 0.14 km and is unbanked. A car weighing 12 kN goes around the curve at a speed of 24 m/s without slipping. What is the magnitude of the horizontal force of the road on the car?

Correct AnswerverifiedShow Answer

A small dense object is suspended from the rear view mirror in a car by a lightweight fiber. As the car is accelerating at 1.90 m/s2, what angle does the string make with the vertical?

Correct AnswerverifiedShow Answer

A 50-kg child riding a Ferris wheel (radius = 10 m) travels in a vertical circle. The wheel completes one revolution every 10 s. What is the magnitude of the force on the child by the seat at the highest point on the circular path?

Correct AnswerverifiedShow Answer

A roller-coaster car has a mass of 500 kg when fully loaded with passengers. The car passes over a hill of radius 15 m, as shown. At the top of the hill, the car has a speed of 8.0 m/s. What is the force of the track on the car at the top of the hill?

Correct AnswerverifiedShow Answer

A 0.50-kg mass attached to the end of a string swings in a vertical circle (radius = 2.0 m) . When the mass is at the highest point of the circle the speed of the mass is 8.0 m/s. What is the magnitude of the force of the string on the mass at this position?

Correct AnswerverifiedShow Answer

A 4.0-kg mass on the end of a string rotates in a circular motion on a horizontal frictionless table. The mass has a constant speed of 2.0 m/s and the radius of the circle is 0.80 m. What is the magnitude of the resultant force acting on the mass?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A car enters a level, unbanked semi-circular hairpin turn of 300 m radius at a speed of 40 m/s. The coefficient of friction between the tires and the road is μ = 0.25. If the car maintains a constant speed of 40 m/s, it will

Correct AnswerverifiedShow Answer

A car travels around an unbanked highway curve (radius 0.15 km) at a constant speed of 25 m/s. What is the magnitude of the resultant force acting on the driver, who weighs 0.80 kN?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

A 1.8-kg block is projected up a rough 10° inclined plane. As the block slides up the incline, its acceleration is 3.8 m/s² down the incline. What is the magnitude of the force of friction acting on the block?

Correct Answer
verified

Correct Answer
verified

A 2.0-kg block slides on a rough horizontal surface. A force (P = 6.0 N) is applied to the block as shown. The magnitude of the block's acceleration is 1.2 m/s². What is the magnitude of the force of friction acting on the block?

Correct Answer
verified

The equation below is the solution to a problem. . The best physical representation of this equation is

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A small dense object is suspended from the rear view mirror in a car by a lightweight fiber. As the car is accelerating at 1.90 m/s², what angle does the string make with the vertical?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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