Full Test Bank Force And Newton'S Laws Of Motion Ch.4 5e

Physics, 9e (Giambattista)

Chapter 4 Force and Newton's Laws of Motion

1) When a person stands on a scale, which of the following is not a force exerted on the scale?

A) a contact force due to the floor

B) a contact force due to the person's feet

C) the weight of the person

D) the weight of the scale

2) A person weighs 146 pounds. The person's weight in newtons is (1 lb = 4.448 N)

A) 445 N.

B) 500 N.

C) 584 N.

D) 649 N.

3) The force that holds charged atoms together is the

A) gravitational force.

B) electromagnetic force.

C) weak interaction.

D) strong nuclear force.

4) Three objects experience interactions. Object A has mass, object B has electrical charge, and object C has both mass and electrical charge. Which of the following statements is true?

A) Object A and object B experience an electrical interaction.

B) Object A and object C experience a gravitational interaction.

C) Object A and object C experience an electrical interaction.

D) Object A and object B experience a gravitational interaction.

5) Three objects experience interactions. Object A has mass, object B has electrical charge, and object C has both mass and electrical charge. Which of the following statements is true?

A) The electrical force on A due to B has a greater magnitude than the gravitational force on B due to A.

B) The electrical force on A due to B has a smaller magnitude than the gravitational force on B due to A.

C) The gravitational force on C due to A has the same magnitude as the gravitational force on A due to C.

D) The electrical force on C due to B has the same magnitude as the gravitational force on C due to B.

6) The force that holds the nucleus together is the

A) gravitational force.

B) electromagnetic force.

C) weak interaction.

D) strong nuclear force.

7) The force that causes an object to fall to Earth is the

A) gravitational force.

B) electromagnetic force.

C) weak interaction.

D) strong nuclear force.

8) Which of the following is a vector quantity?

A) volume

B) force

C) speed

D) time

E) length

9) A person weighs 155 pounds. What is the person's weight in newtons?

A) 155 N

B) 689 N

C) 39.3 N

D) 392 N

10) A 20-kg sack of potatoes at the corner store weighs

A) 190 pounds.

B) 150 pounds.

C) 44 pounds.

D) 9.9 pounds.

11) If an object of mass 20 kg on Earth is sent to the Moon, it will have a mass of

A) 10 kg.

B) 20 kg.

C) 0.0 kg.

D) 4.0 kg.

12) A rock of weight 17.5 N, suspended from a spring scale, is immersed in a beaker of water. The scale reads 9.00 N. The weight of the beaker and water together (without the rock) is 23.5 N. What is the magnitude of the net force of the beaker on the table after the rock has been submerged?

A) 17.5 N

B) 23.5 N

C) 32.0 N

D) 41.0 N

13) A car is driving on a level highway. It is acted upon by the following forces: a downward gravitational force of 12 kN, an upward contact force due to the road of 12 kN, another contact force due to the road of 7 kN directed West, and a drag force due to air resistance of 5 kN directed East. What is the net force acting on the car?

A) 7 kN East

B) 24 kN up

C) 2 kN West

D) 5 kN East

E) 2 kN East

14) A man who weighs 600 N is sitting in a chair with his feet on the floor and arms resting on the armrests. The chair weighs 100 N. Each armrest exerts an upward force of 25.0 N on his arms, and the seat exerts an upward force of 500 N. What force does the floor exert on his feet?

A) 75 N upward

B) 500 N upward

C) 525 N upward

D) 50 N upward

E) 0 N

15) An airplane is traveling in level flight at a constant velocity. L is the lift, W is the weight, T is the thrust, and D is the drag. Which of the diagrams is the correct free-body force diagram for the airplane?

A) Figure 1

B) Figure 2

C) Figure 3

D) Figure 4

E) Figure 5

16) An airplane is flying in horizontal flight at a constant velocity. The weight of the airplane is 40,000 N. The wings produce a lift force that is perpendicular to the wings and a drag force that is parallel to the wings. The engine produces a forward thrust force of 2,000 N. Which of the following statements is true?

A) The net force on the airplane is zero.

B) The net force on the airplane is forward.

C) The net force on the airplane is upward.

D) The net force on the airplane is downward.

E) The net force on the airplane is backward.

17) An airplane is flying in horizontal flight at a constant velocity. The weight of the airplane is 40,000 N. The wings produce a lift force that is perpendicular to the wings and a drag force that is parallel to the wings. The engine produces a forward thrust force of 2,000 N. Which of the following statements is true?

A) The lift force on the airplane is zero.

B) The drag force on the airplane is zero.

C) The lift force on the airplane is 42,000 N upward.

D) The drag force on the airplane is 38,000 N downward.

E) The drag force on the airplane is 2,000 N backward.

18) The net force on a moving object suddenly becomes zero. The object then

A) stops abruptly.

B) stops during a short time interval.

C) changes direction.

D) continues at constant velocity.

E) slows down gradually.

19) A freight train consists of an engine and several identical cars on a straight, level track. Which of the following statements is true?

A) If the train is moving at constant speed, the engine must be pulling with a force greater than the train's weight.

B) If the train is moving at constant speed, the engine's pull on the first car must exceed that car's backward pull on the engine.

C) If the train is coasting, its inertia makes it slow down and eventually stop.

D) If the train is moving at constant speed, the engine's pull must be equal to the force of friction.

20) In the figure an airport luggage carrying train with a tractor T is pulling three luggage carts M1, M2, and M3, with constant velocity of 4.5 m/s. Unfortunately, the wheels on the carts have locked up and are sliding rather than rolling. If T = 300.0 kg, M1 = 200.0 kg, M2 = 100.0 kg, and M3 = 100.0 kg, and the coefficient of kinetic friction for each is 0.4000, what is the force in the connection between the tractor T and cart M1? Use g = 9.8 m/s.

A) 2941 N

B) 2744 N

C) 1568 N

D) 1862 N

E) 2439 N

21) Causing an object to start moving on a frictional surface requires

A) less force than is needed to keep it moving on the surface.

B) the same force as is needed to keep it moving on the surface.

C) more force than is needed to keep it moving on the surface.

D) a force equal to the weight of the object.

E) a force opposite to the normal force.

22) Five children are pushing on a snowball; each pushes with a force of magnitude 10.0 N, and each is pushing at an angle of 45° relative to his neighbor. What is the magnitude of the net push on the ball?

A) 0 N

B) 24.1 N

C) 27.1 N

D) 17 N

E) 50 N

23) In the figure, an airport luggage carrying train with a tractor T is pulling three luggage carts, M1, M2, and M3, with constant velocity of 4.5 m/s. If T = 300 kg, M1 = 200 kg, M2 = 100 kg, and M3 = 100 kg (there is no friction), then the force in the connection between the tractor T and cart M1 is

A) 980 N.

B) 560 N.

C) 280 N.

D) 140 N.

E) 0.00 N.

24) The diagram below represents an ideal pulley system (no mass or friction). What is the force required to lift the 45 kg mass?

A) 442 N

B) 393 N

C) 221 N

D) 147 N

25) A force of 15 N toward the WEST is applied to a 4.0 kg box. Another force of 42 N toward the EAST is also applied to the 4.0 kg box. The net force on the 4.0 kg box is

A) 57 N toward the WEST.

B) 27 N toward the EAST.

C) 36 N toward the WEST.

D) 36 N toward the EAST.

E) 17 N toward the WEST.

26) Diane (weight 255 N) is practicing on a tightrope that is 6.00 meters long (when unstretched) and sags by 0.120 meters under her weight. When she is in the middle of the rope, what is the force (due to the rope) on each eyebolt holding the tightrope?

A) 1.62 × 103 N

B) 3.19 × 103 N

C) 6.38 × 103 N

D) 4.99 × 103 N

27) When an object is in translational equilibrium, which of these statements is not true?

A) The vector sum of the forces acting on the object is zero.

B) The object must be stationary.

C) The object has a constant velocity.

D) The speed of the object is a constant.

28) A space probe leaves the solar system to explore interstellar space. Once it is far from any stars, when must it fire its rocket engines?

A) all the time, in order to keep moving

B) only when it wants to speed up

C) only when it wants to slow down

D) only when it wants to turn

E) when it wants to speed up, slow down, or turn

29) A large massive rock is in contact with the Earth. Draw a force diagram for the rock and the Earth. Which of the following statements is true?

A) The gravitational force on the rock due to the Earth and the gravitational force on the Earth due to the rock are interaction partners.

B) The gravitational force on the rock due to the Earth and the contact force on the Earth due to the rock are interaction partners.

C) The contact force on the Earth due to the rock and the gravitational force on the Earth due to the rock are interaction partners.

D) The gravitational force on the Earth due to the rock and the contact force on the Earth due to the rock are interaction partners.

30) A mass sits at rest on top of a table. Which two forces are interaction pair forces and thus are equal and opposite?

A) the force of gravity on the mass due to the Earth and the force of gravity on the Earth due to the mass

B) the force of gravity on the mass due to the Earth and the contact force on the table due to the mass

C) the contact force on the mass due to the table and the force of gravity on the Earth due to the mass

D) the force of gravity on the mass due to the Earth and the contact force on the mass due to the table

31) Interaction partners

A) are equal in magnitude and opposite in direction and act on the same object.

B) are equal in magnitude and opposite in direction and act on different objects.

C) appear in a free-body diagram for a given object.

D) always involve gravitational force as one partner.

E) act in the same direction on the same object.

32) What is the gravitational field strength on the surface of the Earth? (G = 6.67 × 10-11 N m2/kg2, the mass of the Earth is 5.98 × 1024 kg, and the radius of the Earth is 6.38 × 106 m.)

A) 3.40 N/kg.

B) 6.20 N/kg.

C) 9.80 N/kg.

D) 10.1 N/kg.

E) 20.3 N/kg.

33) What is the gravitational field strength at the location of a satellite that is orbiting the Earth at an altitude of 5,000 km? (G = 6.67 × 10-11 N m2/kg2, the mass of the Earth is 5.98 × 1024 kg, and the radius of the Earth is 6.38 × 106 m.)

A) 9.55 N/kg.

B) 8.43 N/kg.

C) 3.08 N/kg.

D) 6.33 N/kg.

E) 5.28 N/kg.

34) The gravitational field at the Moon due to the Earth is approximately (G = 6.67 × 10-11 N m2/kg2, the mass of the Earth is 5.98 × 1024 kg, and the distance to the Moon is 3.85 × 108 m)

A) 2.69 × 10-3 N/kg toward the Earth.

B) 2.69 × 10-3 N/kg away from the Earth.

C) 7.30 × 10-3 N/kg away from the Earth.

D) 7.30 × 10-3 N/kg toward the Earth.

E) 5.00 × 10-3 N/kg toward the Earth.

35) The gravitational field at the Earth due to the Moon is about (G = 6.67 × 10-11 N m2/kg2, the mass of the Moon is 7.35 × 1022 kg, and the distance to the Moon is 3.85 × 108 m)

A) 2.90 × 10-5 N/kg away from the Moon.

B) 3.31 × 10-5 N/kg toward the Moon.

C) 4.01 × 10-5 N/kg toward the Moon.

D) 3.31 × 10-5 N/kg away from the Moon.

E) 7.50 × 10-5 N/kg away from the Moon.

36) The Moon (mass 7.35 × 1022 kg) orbits the Earth (mass 5.98 × 1024 kg) at a distance of 3.85 × 108 meters. Meanwhile, the Earth orbits the Sun (mass 1.99 × 1030 kg) at a distance of 1.50 × 1011 meters. When the Moon is directly between the Earth and the Sun, what is the gravitational field at the location of the Moon due to the Earth and the Sun combined? (G = 6.67 × 10-11 N m2/kg2)

A) 5.93 × 10-3 N/kg toward the Sun

B) 5.93 × 10-3 N/kg toward the Earth

C) 3.21 × 10-3 N/kg toward the Sun

D) 3.21 × 10-3 N/kg toward the Earth

E) 2.69 × 10-3 N/kg toward the Earth

37) The Moon (mass 7.35 × 1022 kg) is orbiting about the Earth (mass 5.98 × 1024 kg) at a radius of 3.85 × 108 meters. The magnitude of the force of gravity on the Moon due to the Earth is (G = 6.67 × 10-11 N m2/kg2)

A) 9.20 × 1030 N.

B) 3.20 × 1028 N.

C) 6.70 × 1024 N.

D) 1.98 × 1020 N.

E) 4.10 × 1012 N.

38) An object with a mass of 200.0 kg is 500.0 km above the surface of the Earth. The magnitude of the force of gravity on the 200.0 kg mass is (G = 6.67 × 10-11 N m2/kg2, the radius of the Earth is 6.38 × 106 m, and the mass of the Earth is 5.98 × 1024 kg)

A) 2.02 × 103 N.

B) 1.69 × 103 N.

C) 1.42 × 103 N.

D) 1.28 × 103 N.

E) 1.05 × 103 N.

39) What is the gravitational force between two 5.00 kg masses that are 10.0 cm apart from center to center? (G = 6.67 × 10-11 N m2/kg2)

A) 1.67 × 10-8 N

B) 1.67 × 10-7 N

C) 1.62 × 10-6 N

D) 1.62 × 10-5 N

E) 1.67 × 10-4 N

40) What is the gravitational force between two nuclei, each of mass 3.20 × 10-27 kg, which are separated by a distance of 1.06 × 10-10 m? (G = 6.67 × 10-11 N m2/kg2)

A) 6.08 × 10-45 N

B) 6.08 × 10-44 N

C) 6.08 × 10-43 N

D) 6.08 × 10-42 N

41) The weight of a 1.00 kg object on the surface of the Moon is (G = 6.67 × 10-11 N m2/kg2, the radius of the Moon is 1.74 × 106 m, and the mass of the Moon is 7.35 × 1022 kg)

A) 9.80 N.

B) 7.59 N.

C) 1.62 N.

D) 0.981 N.

E) 0.548 N.

42) The highest spot on Earth is Mt. Everest, which is 8850 m above sea level. If the radius of the Earth (to sea level) is 6370 km, how much does the magnitude of g change between sea level and the top of Mt. Everest? (G = 6.67 × 10-11 N m2/kg2, and the mass of the Earth is 5.98 × 1024 kg.)

A) 8.11 m/s2

B) 7.06 m/s2

C) 4.72 m/s2

D) 0.110 m/s2

E) 0.0273 m/s2

43) The Moon (mass 7.35 × 1022 kg) orbits the Earth (mass 5.98 × 1024 kg) at a distance of 3.85 × 108 meters. Meanwhile, the Earth orbits the Sun (mass 1.99 × 1030 kg) at a distance of 1.50 × 1011 meters. When the Moon is directly between the Earth and the Sun, what is the gravitational force on the Moon due to the Earth and the Sun combined? (G = 6.67 × 10-11 N m2/kg2)

A) 4.36 × 1020 N toward the Sun

B) 4.36 × 1020 N toward the Earth

C) 2.36 × 1020 N toward the Sun

D) 2.38 × 1020 N toward the Earth

E) 1.98 × 1020 N toward the Earth

44) A boy with a mass of 55 kg walks into a room and sees a girl 8.0 m in front of him who has a mass of 40 kg. What is his gravitational attraction to her?

A) 2.0 × 108 N

B) 2.3 × 10-9 N

C) 2.2 × 10-11 N

D) 2.4 × 10-8 N

E) 2.1 × 109 N

45) When a force is called a "normal" force, it is

A) the usual force expected given the arrangement of a system.

B) a force that is perpendicular to the surface of the Earth at any given location.

C) a force that is always vertical.

D) a contact force perpendicular to the contact surfaces between two objects.

E) the net force acting on a system.

46) A mass sits at rest on top of a table. Which two forces that are not action-reaction partners are equal and opposite?

A) the force of gravity on the mass due to the Earth and the force of gravity on the Earth due to the mass

B) the contact force on the mass due to the table and the contact force on the table due to the mass

C) the force of gravity on the mass due to the Earth and the contact force on the table due to the mass

D) the force of gravity on the mass due to the Earth and the contact force on the mass due to the table

E) the contact force on the mass due to the table and the force of gravity on the Earth due to the mass

47) Within a given system, the internal forces

A) are always balanced by the external forces.

B) all add to zero.

C) are only determined by subtracting the external forces from the net force on the system.

D) determine the motion of the system.

E) are measured with a gravimeter.

48) A box that weighs 300 N is pulled by a rope across a level surface with a constant velocity. The rope makes an angle of 30.0 degrees above the horizontal, and the tension in the rope is 100 N. What is the magnitude of the normal force from the floor on the box?

A) 86 N

B) 300 N

C) 50 N

D) 250 N

E) 0 N

49) A 750 N box moves at a constant velocity on a floor with a coefficient of static friction μs = 0.800 and coefficient of kinetic friction μk = 0.600. What horizontal force is required to keep the box moving?

A) 600 N

B) 550 N

C) 500 N

D) 450 N

E) 750 N

50) A friction force

A) is a contact force that acts parallel to the contact surfaces.

B) is a normal force between contact surfaces.

C) is a scalar quantity since it can act in any direction along a surface.

D) does not depend on the nature of the surfaces.

51) A block is at rest on a wooden ramp. The coefficient of static friction between the block and ramp is 0.35. If the ramp is gradually elevated on one side, at what angle (between the ramp and the horizontal) will the block first begin to slide?

A) 17°

B) 19°

C) 29°

D) 20°

E) 22°

52) A 750 N box rests on the floor. The coefficient of static friction between the box and the floor is 0.800, and the coefficient of kinetic friction is 0.600. If a horizontal force of 550 N is applied to the box, what will be the magnitude of the force of friction on the box due to the floor?

A) 600 N

B) 450 N

C) 750 N

D) 550 N

E) 440 N

53) A 755 N box rests on a floor with a coefficient of kinetic friction of 0.600 and a coefficient of static friction of 0.800. What horizontal force is required to start the box moving?

A) 755 N

B) 453 N

C) 254 N

D) 653 N

E) 604 N

54) In order to slide a 753 N box across the floor at a constant speed, you must push horizontally with a force of magnitude 452 N. What is the coefficient of kinetic friction?

A) 1.66

B) 0.600

C) 0.660

D) 0.580

E) 1.65

55) In order to slide a 70 kg box across the floor at a constant speed, you must push horizontally with a force of magnitude 351 N. What is the coefficient of kinetic friction?

A) 0.15

B) 0.58

C) 0.34

D) 0.51

E) 0.68

56) A force of magnitude 451 N is applied horizontally to 111 kg box, which is at rest on the floor. The coefficient of static friction between the box and the floor is 0.450. What is the magnitude of the force of friction from the floor on the box?

A) 490 N

B) 0.00 N

C) 108 N

D) 451 N

E) 203 N

57) A 90.0 N crate of apples sits at rest on a ramp that runs from the ground to the bed of a truck. The ramp is inclined at 20° to the horizontal. What is the normal force exerted on the crate by the ramp?

A) 86.9 N

B) 84.6 N

C) 75.8 N

D) 30.8 N

E) 38.5 N

58) Which would require the least force to move a box along a floor with a coefficient of friction of 0.30?

A) pull it with a rope at an angle of 30° above the horizontal

B) push it at an angle of 30° below the horizontal

C) either pull it with a rope at an angle of 30° above the horizontal or push it at an angle of 30° below the horizontal

D) not enough information to solve

59) A rope is connected to a spring scale on the left and exerts a force T1. Another rope is connected to the scale on the right and exerts a force T2. The scale shows a reading of Ts = 120 N. The values of T1 and T2 are

A) T1 = 80 N, and T2 = 80 N.

B) T1 = 120 N, and T2 = 120 N.

C) T1 = 240 N, and T2 = 240 N.

D) T1 = 80 N, and T2 = 120 N.

60) One person holds a spring scale while another pulls until the scale reads 32 N. What is the force that the person holding the scale applies?

A) 32 N

B) 16 N

C) 64 N

D) 48 N

E) 0.0 N

61) A sled has a mass of 10.0 kg. It is held in place on a frictionless 20.0 degree slope by a rope attached to a stake at the top of the slope. Find the tension in the rope, assuming it is parallel to the slope.

A) 47.9 N

B) 37.4 N

C) 94.1 N

D) 33.5 N

E) 23.8 N

62) A 120 N traffic light is located at the midpoint of a cable between two poles. The cable makes an angle of 30° to the horizontal at each pole. What is the tension in the cable? Ignore the mass of the cable.

A) 60.0 N

B) 90.0 N

C) 140 N

D) 110 N

E) 120 N

63) The fundamental force that governs the motion of the planets is the

A) strong force.

B) weak force.

C) electromagnetic force.

D) gravitational force.

64) The fundamental force that binds the electrons to the nuclei to form atoms is the

A) strong force.

B) weak force.

C) electromagnetic force.

D) gravitational force.

65) The fundamental force that is the weakest of the four is the

A) strong force.

B) weak force.

C) electromagnetic force.

D) gravitational force.

66) The fundamental force that has the shortest range is the

A) strong force.

B) weak force.

C) electromagnetic force.

D) gravitational force.

67) An airplane flies with a constant speed at an angle of 25 degrees above the horizontal, in a straight line. Which statement below is not true?

A) The net force on the plane is zero.

B) The lift is the same magnitude as the weight.

C) The plane has a constant velocity.

D) The thrust is greater in magnitude than the drag.

68) An airplane flies with a constant speed at an angle of 25 degrees below the horizontal, in a straight line. Which statement below is not true?

A) The thrust is greater in magnitude than the drag.

B) The weight is greater in magnitude than the lift.

C) The net force on the plane is zero

D) The plane has constant velocity.

69) A box weighing 550 N slides at constant speed across a flat parking lot, under the influence of a stiff wind. The wind applies a force of 155 N parallel to the ground. What is the angle relative to the vertical of the contact force applied by the ground?

A) 75°

B) 74°

C) 90°

D) 16°

E) 15°

70) A box is pushed across a horizontal table at a constant speed. Of the forces acting, which pair do we know are equal in magnitude because of Newton's third law?

A) The normal force on the box and the weight of the box.

B) The normal force on the box and the normal force on the table from the box.

C) The force of kinetic friction on the box and the external pushing force applied to the box.

D) None of these are interaction pairs.

71) A box rests on a frictionless countertop. A boy pushes horizontally to the right on the box, and a girl pushes on it to the left, yet it remains stationary. Which of the following statements is false?

A) We know the force of the boy on the box is equal in magnitude to the force of the girl on the box, because the box is in equilibrium.

B) We know the force of the boy on the box is equal in magnitude to the force of the box on the boy, because of Newton's third law.

C) We know the weight and normal force are equal in magnitude because the box is in equilibrium.

D) We know the weight and normal force are equal in magnitude because of Newton's third law.

72) A box is pushed across a horizontal table by a boy applying a force of 32 N to the box. A force of friction of magnitude 19 N acts opposite the direction of motion. A stiff wind also opposes the box's motion. What force does the box exert on the boy's hand?

A) 13 N

B) 32 N

C) 51 N

D) Without knowing the force the wind applies, the question cannot be answered.

73) A crate travels through a factory on a straight, horizontal conveyor belt at a constant speed. If air resistance is negligible, what forces are active on the box?

A) normal force, weight, static friction

B) normal force, weight, force of the conveyor belt

C) normal force, weight, force of the conveyor belt, static friction

D) normal force and weight

74) A crate travels through a factory on a conveyor belt (without slipping) at a constant speed. The conveyer belt is inclined at some non-zero angle above the horizontal. If air resistance is negligible, what forces are active on the box?

A) normal force, weight, static friction, kinetic friction

B) normal force, weight, static friction

C) normal force, weight, static friction, force of the conveyor belt

D) normal force and weight

75) Your friend applies a horizontal force to your 2.0-kg physics textbook, holding it stationary against a vertical wall. The static and kinetic friction coefficients between the book and the wall are 0.20 and 0.15, respectively. With what force must your friend push on the book in order for it not to slip down the wall?

A) 39 N

B) 20 N

C) 19.6 N

D) 25 N

E) 98 N

76) You find a coin resting on your physics book cover and notice that when you open the cover, the coin slips exactly when the cover reaches 25 degrees above the horizontal. What is the coefficient of static friction between the coin and book cover?

A) 2.1

B) 0.91

C) 0.37

D) 0.47

E) The question cannot be answered without knowing the coin's mass.

77) Two dogs are pulling on opposite ends of a bone, each with a force of 150 N, in opposite directions along the length of the bone. What is the tension in the bone?

A) 0 N

B) 150 N

C) 300 N

D) More information is needed to answer this question.

78) A mountain climber lies flat on the surface of a glacier (assumed frictionless), which is inclined at 30 degrees to the horizontal. He remains stationary because he is holding on to a rope that is attached to a spike in the ice further up the slope. The rope is parallel to the surface of the ice. If the force of the ice on the climber is 210 N, what is the tension in the rope?

A) 121 N

B) 105 N

C) 182 N

D) 364 N

E) 242 N

79) A 1.75-kg picture frame is hung on the wall by means of a horizontal string on the back of the frame. The string is attached to screws on the sides if the frame, which are separated by a distance of 37.0 cm. When hung from a nail on the wall, the string is displaced at its center by a vertical distance of 4.00 cm. What is the tension T in the string?

A) 8.6 N

B) 40.6 N

C) 159 N

D) 17.2 N

E) 79.4 N

80) A worker lifts a heavy load using a two-pulley system as in the figure. If the tension in the rope segment labeled A is 1450 N, what are the weight of the load and the force that the worker exerts on the rope, respectively?

A) 363 N, 725 N

B) 725 N, 363 N

C) 1450 N, 725 N

D) 1450 N, 1450 N

E) Insufficient information is given to answer this question.

81) The fundamental force that is the principal cause of what we experience as friction is the

A) gravitational force.

B) electromagnetic force.

C) weak force.

D) strong force.

82) The static friction force on an object

A) can never be greater than the kinetic friction force on it under the same circumstances.

B) can never accelerate the object.

C) can never be greater than the normal force on it.

D) can never be greater than the object's weight.

E) None of the choices are correct.

83) A tractor T is pulling a trailer M with a constant velocity. If the velocity is 20 m/s and M = 200 kg and T = 500 kg, then the force on the trailer due to the tractor is (assume there is no friction or air resistance)

A) 600 N forward.

B) 450 N backward.

C) 200 N backward.

D) 35 N forward.

E) 0.

84) A tractor T is pulling a trailer M with a constant acceleration. If the forward acceleration is 1.5 m/s2 and M = 400 kg and T = 500 kg, then the force on the tractor due to the trailer is (ignore air resistance)

A) 600 N backward.

B) 450 N backward.

C) 200 N forward.

D) 35 N forward.

E) 0.

85) A tractor T is pulling a trailer M with a constant acceleration. If the forward acceleration is 0.50 m/s2 and M = 400 kg and T = 500 kg, then the horizontal force on the tractor due to the ground is (ignore air resistance)

A) 450 N forward.

B) 450 N backward.

C) 250 N forward.

D) 250 N backward.

E) 200 N forward.

86) A tractor T is pulling two trailers, M1 and M2, with a constant acceleration. T has a mass of 200 kg, M1 has a mass of 100 kg, and M2 has a mass of 150 kg. If the forward acceleration is 0.60 m/s2, then the horizontal force on the tractor due to the ground is (ignore air resistance)

A) 270 N backward.

B) 270 N forward.

C) 150 N backward.

D) 150 N forward.

E) 90 N forward.

87) A tractor T is pulling two trailers, M1 and M2, with a constant acceleration. T has a mass of 200 kg, M1 has a mass of 100 kg, and M2 has a mass of 150 kg. If the forward acceleration is 0.60 m/s2, and air resistance is negligible, then the horizontal force on the tractor due to the attachment to M1 is

A) 270 N backward.

B) 270 N forward.

C) 150 N backward.

D) 150 N forward.

E) 90 N forward.

88) A tractor T is pulling two trailers, M1 and M2, with a constant acceleration. T has a mass of 200 kg, M1 has a mass of 100 kg, and M2 has a mass of 150 kg. If the forward acceleration is 0.60 m/s2, and air resistance is negligible, then the horizontal force on M2 due to the attachment to M1 is

A) 270 N backward.

B) 270 N forward.

C) 150 N backward.

D) 150 N forward.

E) 90 N forward.

89) A tractor of mass M1 = 2,000 kg is pulling a trailer of mass M2 = 5,000 kg. If the tractor-trailer is accelerated at 2.0 m/s2, and air resistance is negligible, then the tension in the trailer hitch that connects the trailer to the tractor is

A) 6,000 N.

B) 8,000 N.

C) 9,000 N.

D) 10,000 N.

E) 11,000 N.

90) A tractor of mass M1 = 2,000 kg is pulling a trailer of mass M2 = 5,000 kg. If the tractor-trailer is accelerated at 2.0 m/s2, and air resistance is negligible, then the magnitude of the force the tractor applies to the road is

A) 14,000 N.

B) 12,000 N.

C) 10,000 N.

D) 8,000 N.

E) 6,000 N.

91) In the figure, an airport luggage-carrying train with a tractor T is pulling three luggage carts, M1, M2, and M3 with an acceleration of 1.2 m/s2. If T = 300 kg, M1 = 200 kg, M2 = 100 kg, and M3 = 100 kg, and air resistance is negligible, then the tension in the connection between cart M2 and cart M1 is

A) 840 N.

B) 480 N.

C) 240 N.

D) 120 N.

E) 0 N.

92) In the figure, an airport luggage-carrying train with a tractor T is pulling three luggage carts, M1, M2, and M3 with an acceleration of 1.0 m/s2. If T = 300 kg, M1 = 200 kg, M2 = 100 kg, and M3 = 100 kg, and air resistance is negligible, then the tension in the connection between cart M2 and cart M3 is

A) 700 N.

B) 400 N.

C) 200 N.

D) 100 N.

E) 0 N.

93) Two masses are suspended by a cord that passes over a pulley with negligible mass. The cord also has negligible mass. One of the masses, m1, has a mass of 5.0 kg and the other mass, m2, has a mass of 3.0 kg. The acceleration of m1 is

A) 3.3 m/s2 upward.

B) 3.3 m/s2 downward.

C) 2.5 m/s2 upward.

D) 2.5 m/s2 downward.

E) 1.1 m/s2 upward.

94) Two masses are suspended by a cord that passes over a pulley with negligible mass. The cord also has negligible mass. One of the masses, m1, has a mass of 6.0 kg and the other mass, m2, has a mass of 4.0 kg. The force of the cord attached to m1 is about

A) 47 N upward.

B) 47 N downward.

C) 33 N upward.

D) 33 N downward.

E) 15 N upward.

95) Two masses are suspended by a cord that passes over a pulley with negligible mass. The cord also has negligible mass. One of the masses, m1, has a mass of 7.0 kg and the other mass, m2, has a mass of 3.0 kg. The pulley turns on a shaft through the center of the pulley, which supports the pulley and all the masses. The vertical force of the shaft on the pulley is

A) 49 N upward.

B) 49 N downward.

C) 82 N upward.

D) 82 N downward.

E) 98 N upward.

96) Two masses are connected by a cord that passes over a pulley as shown in the figure. The pulley and cord have negligible mass and m2 (2.0 kg) moves on a horizontal surface without friction, while m1 (2.0 kg) is suspended vertically. What is the acceleration of m1?

A) 3.9 m/s2 downward

B) 12 m/s2 downward

C) 6.0 m/s2 downward

D) 4.9 m/s2 downward

97) Two masses are connected by a cord that passes over a pulley as shown in the figure. The pulley and the cord have negligible mass and m2 (6.0 kg) moves on a horizontal surface with a coefficient of static friction of 0.5, while m1 (2.0 kg) is suspended vertically. If the masses start from rest, what is the acceleration of m2?

A) 0.0 m/s2

B) 3.0 m/s2

C) 1.0 m/s2

D) 2.9 m/s2

98) An 80.0 kg person is riding in an elevator that is accelerating at 2.40 m/s2 downward. The apparent weight of the 80.0 kg person measured on a scale in the elevator is

A) 592 N.

B) 639 N.

C) 784 N.

D) 855 N.

E) 976 N.

99) An airplane is flying in horizontal flight with a constant acceleration of 2.00 m/s2. The weight of the airplane is 40,000 N. The wings produce a lift force that is perpendicular to the wings and a drag force which is parallel to the wings. The drag force is 2,000 N. The forward thrust force the engine produces is

A) 2,800 N.

B) 4,000 N.

C) 7,500 N.

D) 8,000 N.

E) 10,200 N.

100) A 1.7 kg model airplane is flying north at 12.5 m/s initially, and 25 seconds later is observed heading 30 degrees west of north at 25 m/s. What is the magnitude of the average net force on the airplane during this time interval?

A) 0.85 N

B) 0.63 N

C) 1.1 N

D) 1.5 N

101) A 78.0 kg object is travelling due north at 15.2 m/s when it begins to experience a constant net force of 1.72 kN toward the south. How long will it take to stop under the influence of this force?

A) 1.45 s

B) 2.98 s

C) 0.335 s

D) 0.689 s

102) A 78 kg object is travelling due north at 15.2 m/s when it begins to experience a constant net force of 1.72 kN toward the south. What will its velocity be 0.75 s later?

A) 18.8 m/s, south

B) 1.3 m/s, south.

C) 1.3 m/s, north.

D) 18.8 m/s, north.

E) 16.5 m/s, north

F) 16.5 m/s, south

103) An object travels 7.5 m/s toward the west. Under the influence of a constant net force of 5.2 kN, it comes to rest in 3.2 s. What is its mass?

A) 2200 kg

B) 1600 kg

C) 1100 kg

D) 690 kg

104) An object travels 7.5 m/s toward the west. Under the influence of a constant net force of 5.2 kN, after 4.3 s, it is travelling 2.5 m/s toward the east. What is its mass?

A) 2200 kg

B) 4500 kg

C) 6000 kg

D) 12000 kg

105) Two masses are being pulled up a 30.0 degree incline by a force F parallel to the incline. The acceleration up the incline is 1.00 m/s2 and the velocity is up the incline. The force is applied to a 200 kg mass, and a string connects the 200 kg mass to a 150 kg mass. The coefficient of kinetic friction is 0.200. The tension in the string is

A) 2,660 N.

B) 1,140 N.

C) 980 N.

D) 875 N.

E) 633 N.

106) Two masses are being pulled up a 30.0 degree incline by a force F parallel to the incline. The acceleration down the incline is 1.00 m/s2 and the velocity is up the incline. The force is applied to a 200 kg mass, and a string connects the 200 kg mass to a 150 kg mass. The coefficient of kinetic friction is 0.200. The tension in the string is

A) 840 N.

B) 980 N.

C) 1,140 N.

D) 1,530 N.

E) 2,660 N.

107) Two masses are being pulled up a 30.0 degree incline by a force F parallel to the incline. The acceleration down the incline is 1.00 m/s2 and the velocity is down the incline. The force is applied to a 200 kg mass and a string connects the 200 kg mass to a 150 kg mass. The coefficient of kinetic friction is 0.200. The force F is

A) 771 N.

B) 875 N.

C) 1,050 N.

D) 1,960 N.

E) 2,330 N.

108) Two masses are being pulled up a 30.0 degree incline by a force F parallel to the incline. The acceleration up the incline is 1.00 m/s2 and the velocity is down the incline. The force is applied to a 200 kg mass and a string connects the 200 kg mass to a 150 kg mass. The coefficient of kinetic friction is 0.200. The force F is

A) 2,660 N.

B) 1,530 N.

C) 1,470 N.

D) 980 N.

E) 750 N.

109) Two masses are being pulled up a frictionless 30.0 degree incline by a force F parallel to the incline. The acceleration up the incline is 1.00 m/s2. The force is applied to a 200 kg mass and a string connects the 200 kg mass to a 150 kg mass. The force F is

A) 875 N.

B) 980 N.

C) 1,140 N.

D) 1,720 N.

E) 2,070 N.

110) Two masses are being pulled up a 30.0 degree incline by a force F parallel to the incline. The acceleration down the incline is 1.00 m/s2 and the velocity is up the incline. The force is applied to a 200 kg mass and a string connects the 200 kg mass to a 150 kg mass. There is no friction. The tension in the string is

A) 585 N.

B) 1470 N.

C) 980 N.

D) 771 N.

E) 1365 N.

111) Two objects attract each other gravitationally. If the distance between their centers doubles, the gravitational force

A) is a half.

B) doubles.

C) is a fourth.

D) quadruples.

112) A 450 g baseball is pitched, reaching the batter with a speed of 37 m/s, and is hit such that it returns on the same line at 48 m/s. If the ball was in contact with the bat for 0.22 seconds, what was the magnitude of the average net force experienced by the ball during the time of contact?

A) 170 N

B) 98 N

C) 77 N

D) 18 N

113) Two masses are connected by a string which passes over a pulley with negligible mass and friction. One mass hangs vertically and one mass slides on a frictionless 30.0 degree incline. The vertically hanging mass is 6.00 kg and the mass on the incline is 4.00 kg. The magnitude of the acceleration of the 4.00 kg mass is

A) 2.98 m/s2.

B) 3.92 m/s2.

C) 5.88 m/s2.

D) 6.86 m/s2.

E) 7.84 m/s2.

114) Two masses are connected by a string which passes over a pulley with negligible mass and friction. One mass hangs vertically and one mass slides on a 30.0 degree frictionless incline. The vertically hanging mass is 4.00 kg and the mass on the incline is 6.00 kg. The acceleration of the 4.00 kg mass is

A) 0.980 m/s2 down.

B) 3.92 m/s2 down.

C) 0.980 m/s2 up.

D) 3.92 m/s2 up.

E) 7.84 m/s2 up.

115) Two masses are connected by a string which passes over a pulley with negligible mass and friction. One mass hangs vertically and one mass slides on a 30.0 degree frictionless incline. The vertically hanging mass is 6.00 kg and the mass on the incline is 4.00 kg. The magnitude of the acceleration of the 4.00 kg mass is

A) 1.98 m/s2.

B) 3.92 m/s2.

C) 5.75 m/s2.

D) 6.86 m/s2.

E) 7.84 m/s2.

116) Two masses are connected by a string which passes over pulley with negligible mass and friction. One mass hangs vertically and one mass slides on a 30.0 degree frictionless incline. The vertically hanging mass is 4.00 kg and the mass on the incline is 6.00 kg. The magnitude of the acceleration of the 4.00 kg mass is

A) 2.98 m/s2.

B) 3.92 m/s2.

C) 5.75 m/s2.

D) 6.86 m/s2.

E) 7.84 m/s2.

117) Two masses are connected by a string which passes over a pulley with negligible mass and friction. One mass hangs vertically and one mass slides on a frictionless horizontal surface. The vertically hanging mass is 6.00 kg and the mass on the horizontal surface is 4.00 kg. The acceleration of the 4.00 kg mass is

A) 1.98 m/s2 to the left.

B) 3.92 m/s2 to the left.

C) 5.88 m/s2 to the left.

D) 6.75 m/s2 to the left.

E) 7.84 m/s2 to the left.

118) Two masses are connected by a string which passes over a pulley with negligible mass and friction. One mass hangs vertically and one mass slides on a frictionless horizontal surface. The horizontal surface has a coefficient of kinetic friction of 0.2. The vertically hanging mass is 4.00 kg and the mass on the horizontal surface is 6.00 kg. The acceleration of the 4.00 kg mass is

A) 1.98 m/s2 down

B) 2.74 m/s2 down

C) 4.88 m/s2 down

D) 6.73 m/s2 down

E) 7.84 m/s2 down

119) Two masses are connected by a string which passes over a pulley with negligible mass and friction. One mass hangs vertically and one mass slides on a 30.0 degree frictionless incline. The vertically hanging mass is 3.00 kg and the mass on the incline is 6.00 kg. The magnitude of the acceleration of the 3.00 kg mass is

A) 7.48 m/s2.

B) 6.72 m/s2.

C) 2.98 m/s2.

D) 1.03 m/s2.

E) 0.00 m/s2.

120) Two masses are connected by a string which passes over a pulley with negligible mass and friction. One mass hangs vertically and one mass slides on a 30.0 degree incline. The inclined surface has a coefficient of kinetic friction of 0.200. The vertically hanging mass is 6.00 kg and the mass on the incline is 4.00 kg. The magnitude of the acceleration of the 4.00 kg mass is (the initial velocity of the 4.00 kg mass is down the incline)

A) 7.16 m/s2.

B) 5.84 m/s2.

C) 2.98 m/s2.

D) 1.53 m/s2.

E) 0.00 m/s2.

121) Two masses are connected by a string which passes over a pulley with negligible mass and friction. One mass hangs vertically and one mass slides on a 30.0 degree incline. The inclined surface has a coefficient of kinetic friction of 0.200. The vertically hanging mass is 4.00 kg and the mass on the incline is 6.00 kg. The magnitude of the acceleration of the 4.00 kg mass is (the initial velocity of the 6.00 kg mass is down the incline)

A) 7.16 m/s2.

B) 5.84 m/s2.

C) 2.98 m/s2.

D) 1.53 m/s2.

E) 3.90 m/s2.

122) Two masses are connected by a string which passes over a pulley with negligible mass and friction. One mass hangs vertically and one mass slides on a horizontal surface. The horizontal surface has a coefficient of kinetic friction of 0.200. The vertically hanging mass is 3.00 kg and the mass on the horizontal surface is 3.00 kg. The magnitude of the acceleration of the vertically hanging mass is (the initial velocity of the horizontal mass is to the right)

A) 7.16 m/s2.

B) 5.88 m/s2.

C) 4.02 m/s2.

D) 3.53 m/s2.

E) 2.00 m/s2.

123) You are standing on a bathroom scale in an elevator that is not moving, and the scale reads 500 N. If the elevator were instead moving downward at a constant velocity of 4.50 m/s, what would the scale read?

A) 100 N

B) 450 N

C) 500 N

D) 750 N

E) 250 N

124) An object of mass m is hanging by a string from the roof of an elevator. The elevator is moving up at a constant speed. What is the tension in the string?

A) greater than mg

B) less than mg

C) equal to mg

D) depends on the speed of the elevator

125) An object of mass m is hanging by a string from the roof of an elevator. The elevator is moving downward and slowing down. What is the tension in the string?

A) greater than mg

B) less than mg

C) equal to mg

D) depends on the speed of the elevator

126) An object of mass m is hanging by a string from the roof of an elevator. The elevator is increasing its upward speed. What is the tension in the string?

A) greater than mg

B) less than mg

C) equal to mg

D) depends on the speed of the elevator

127) A skydiver has bailed out of his airplane at a height of 3000 m. The mass of the skydiver and his parachute is 80 kg. What is the drag (force of air resistance) on the system (man plus parachute) when he reaches terminal speed?

A) 120 N

B) 360 N

C) 784 N

D) 750 N

128) A 92.5 kg stunt man stands on a piston that will launch him out of a vertical tube. The piston applies a constant force F to the man's feet. Starting from rest, the force is applied for 1.20 s, and during that time interval, the man attains a velocity of 25.5 m/s. What was the man's apparent weight during this time interval?

A) Unable to answer without knowing the value of F.

B) 3740 N

C) 1970 N

D) 2830 N

E) 2870 N

129) A 92.5 kg stunt man stands on a piston that will launch him out of a vertical tube. The piston applies a constant force F to the man's feet. Starting from rest, the force is applied as the man moves vertically 3.25 m, and while the piston is pushing, the man attains a velocity of 25.5 m/s. What was the man's apparent weight during this time interval?

A) 9.3 kN

B) 18.5 kN

C) 19.4 kN

D) 10.2 kN

130) A 35.0 kg girl swings on a swing set. At the bottom of the swing's path, she feels as though she weighs 435 N. What is the value of the tension in the swing's ropes at the bottom of the swing's path?

A) 92 N

B) 435 N

C) 343 N

D) 778 N

131) On the way to lower floors, an elevator begins its descent from rest with a constant acceleration, descending the first 5.0 m in 1.85 s. What is the apparent weight of a 75 kg man inside the accelerator during this time interval?

A) 0.74 kN

B) 0.52 kN

C) 0.11 kN

D) 1.0 kN