Question 1

The gravitational field at a satellite that is orbiting about the earth at an altitude of 5,000 km is (G = 6.67 $\times$ 10-11 N m2/kg2,the mass of the earth is 5.98 $\times$ 1024 kg)

Accepted Answer

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. 
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. C

Question 2

A crate travels through a factory on a conveyor belt that is inclined at some non-zero angle above the horizontal at a constant speed.If air resistance is negligible,what forces are active on the box?

Accepted Answer

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 
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 B

Question 3

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

Accepted Answer

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. 
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. B

Question 4

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

Accepted Answer

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 
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

Question 5

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

Accepted Answer

A)  190 pounds. 
B)  150 pounds. 
C)  44 pounds. 
D)  9.9 pounds. 
A)  190 pounds. 
B)  150 pounds. 
C)  44 pounds. 
D)  9.9 pounds.

Question 6

A friction force

Accepted Answer

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. 
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.

Question 7

A force of 15.2N directed along the positive x-axis combines with a second force to produce a total force vector of magnitude 17.9N.What is the magnitude of the second vector?

Accepted Answer

A)  2.7N 
B)  9.5N 
C)  23.5N 
D)  Not enough information is given. 
A)  2.7N 
B)  9.5N 
C)  23.5N 
D)  Not enough information is given.

Question 8

An airplane flies at a constant speed at an angle of 25 degrees below the horizontal.Which statement below is not true?

Accepted Answer

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. 
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.

Question 9

The moon with a mass of 7.35 $\times$ 1022 kg is orbiting about the earth with a mass of 5.98 $\times$ 1024 kg at a radius of 3.85 $\times$ 108 meters.The earth is orbiting about the sun with a mass of 1.99 $\times$ 1030 kg at a radius of 1.50 $\times$ 1011 meters.The force of gravity on the moon when it is between the earth and the sun is (G = 6.67 $\times$ 10-11 N m2/kg2)

Accepted Answer

A)  4.36 $\times$ 1020 N toward the sun. 
B)  4.36 $\times$ 1020 N toward the earth. 
C)  2.36 $\times$ 1020 N toward the sun. 
D)  2.38 $\times$ 1020 N toward the earth. 
E)  1.98 $\times$ 1020 N toward the earth. 
A)  4.36 $\times$ 1020 N toward the sun. 
B)  4.36 $\times$ 1020 N toward the earth. 
C)  2.36 $\times$ 1020 N toward the sun. 
D)  2.38 $\times$ 1020 N toward the earth. 
E)  1.98 $\times$ 1020 N toward the earth.

Question 10

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

Accepted Answer

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 friction 
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 friction

Question 11

A 1.75-kg picture frame is hung on the wall by means of a string as in the figure (show picture frame with distance between the points of connection on the frame labeled with 37.0cm and vertical displacement of the string as 4.00cm).What is the tension T in the string?

Accepted Answer

A)  8.6 N 
B)  40.6 N 
C)  159 N 
D)  17.2 N 
E)  79.4 N 
A)  8.6 N 
B)  40.6 N 
C)  159 N 
D)  17.2 N 
E)  79.4 N

Question 12

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

Accepted Answer

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. 
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.

Question 13

Three objects experience interactions.Object A has mass,object B has electrical charge,and object C has both mass and electrical charge.Object A and object B have a rope connected between them.Which of the following statements are true?

Accepted Answer

A)  the electrical force on A due to B has the same magnitude as the gravitational force on B due to A 
B)  the gravitational force on C due to A has the same magnitude as the gravitational force on A due to C 
C)  the rope force on A due to B has the same magnitude as the electrical force on B due to A 
D)  the rope force on B due to A has the same magnitude as the gravitational force on A due to C 
A)  the electrical force on A due to B has the same magnitude as the gravitational force on B due to A 
B)  the gravitational force on C due to A has the same magnitude as the gravitational force on A due to C 
C)  the rope force on A due to B has the same magnitude as the electrical force on B due to A 
D)  the rope force on B due to A has the same magnitude as the gravitational force on A due to C

Question 14

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?

Accepted Answer

A)  32 N 
B)  16 N 
C)  64 N 
D)  48 N 
E)  0.0 N 
A)  32 N 
B)  16 N 
C)  64 N 
D)  48 N 
E)  0.0 N

Question 15

A mountain climber lies flat on the surface of a glacier that is inclined at 30 degrees below the horizontal.He remains stationary because he is holding onto a rope attached to a spike embedded in the ice further up slope than he is.The rope is parallel to the surface of the ice.If the force of the ice upon his body is 210N,what is the tension in the rope?

Accepted Answer

A)  121N 
B)  105N 
C)  182N 
D)  364N 
E)  242N 
A)  121N 
B)  105N 
C)  182N 
D)  364N 
E)  242N

Question 16

The gravitational field at the moon due to the earth is (the mass of the earth is 5.98 $\times$ 1024 kg,the distance to the moon is 3.85 $\times$ 108 m)

Accepted Answer

A)  2.69 $\times$ 10-3 N/kg toward the earth. 
B)  2.69 $\times$ 10-3 N/kg away from the earth. 
C)  7.30 $\times$ 10-3 N/kg away from the earth. 
D)  7.30 $\times$ 10-3 N/kg toward the earth. 
E)  5.00 $\times$ 10-3 N/kg toward the earth. 
A)  2.69 $\times$ 10-3 N/kg toward the earth. 
B)  2.69 $\times$ 10-3 N/kg away from the earth. 
C)  7.30 $\times$ 10-3 N/kg away from the earth. 
D)  7.30 $\times$ 10-3 N/kg toward the earth. 
E)  5.00 $\times$ 10-3 N/kg toward the earth.

Question 17

A person weighs 146 pounds.The person's weight is (1 lb = 4.45 N)

Accepted Answer

A)  445 N. 
B)  500 N. 
C)  584 N. 
D)  650 N. 
A)  445 N. 
B)  500 N. 
C)  584 N. 
D)  650 N.

Question 18

Within a given system,the internal forces

Accepted Answer

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. 
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.

Question 19

Interaction partners

Accepted Answer

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. 
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.

Question 20

A 750 N box rests on a floor with a coefficient of static friction = 0.800 and coefficient of kinetic friction = 0.600.What is the force of friction if a horizontal force of 550 N is applied to the box?

Accepted Answer

A)  600 N 
B)  450 N 
C)  750 N 
D)  550 N 
E)  440 N 
A)  600 N 
B)  450 N 
C)  750 N 
D)  550 N 
E)  440 N

Exam 2: Force

The gravitational field at a satellite that is orbiting about the earth at an altitude of 5,000 km is (G = 6.67 ×\times× 10-11 N m2/kg2,the mass of the earth is 5.98 ×\times× 1024 kg)

A crate travels through a factory on a conveyor belt that is inclined at some non-zero angle above the horizontal at a constant speed.If air resistance is negligible,what forces are active on the box?

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

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

A friction force

A force of 15.2N directed along the positive x-axis combines with a second force to produce a total force vector of magnitude 17.9N.What is the magnitude of the second vector?

An airplane flies at a constant speed at an angle of 25 degrees below the horizontal.Which statement below is not true?

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

A 1.75-kg picture frame is hung on the wall by means of a string as in the figure (show picture frame with distance between the points of connection on the frame labeled with 37.0cm and vertical displacement of the string as 4.00cm).What is the tension T in the string?

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

Three objects experience interactions.Object A has mass,object B has electrical charge,and object C has both mass and electrical charge.Object A and object B have a rope connected between them.Which of the following statements are true?

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?

The gravitational field at the moon due to the earth is (the mass of the earth is 5.98 ×\times× 1024 kg,the distance to the moon is 3.85 ×\times× 108 m)

A person weighs 146 pounds.The person's weight is (1 lb = 4.45 N)

Within a given system,the internal forces

Interaction partners

A 750 N box rests on a floor with a coefficient of static friction = 0.800 and coefficient of kinetic friction = 0.600.What is the force of friction if a horizontal force of 550 N is applied to the box?

Introduction

Acceleration and Newtons Second Law of Motion

Motion With Constant Acceleration

Circular Motion

Conservation of Energy

Linear Momentum

Torque and Angular Momentum

Fluids

Elasticity and Oscillations

Waves

Sound

Temperature and the Ideal Gas

Heat

Thermodynamics

Electric Forces and Fields

Electric Potential

Electric Current and Circuits

Magnetic Forces and Fields

Electromagnetic Induction

Alternating Current

Electromagnetic Waves

Reflection and Refraction of Light

Optical Instruments

Interference and Diffraction

Relativity

Early Quantum Physics and the Photon

Quantum Physics

Nuclear Physics

Particle Physics

Filters

The gravitational field at a satellite that is orbiting about the earth at an altitude of 5,000 km is (G = 6.67 $\times$ 10^-11 N m²/kg²,the mass of the earth is 5.98 $\times$ 10²⁴ kg)

The gravitational field at the moon due to the earth is (the mass of the earth is 5.98 $\times$ 10²⁴ kg,the distance to the moon is 3.85 $\times$ 10⁸ m)