Question 1

A 1.5-kg mass has an acceleration of   . Only two forces act on the mass. If one of the forces is   , what is the magnitude of the other force?

Accepted Answer

A) 4.1 N 
B) 6.1 N 
C) 5.1 N 
D) 7.1 N 
E) 2.4 N 
A) 4.1 N 
B) 6.1 N 
C) 5.1 N 
D) 7.1 N 
E) 2.4 N C

Question 2

If M = 6.0 kg, what is the tension in string 1?

Accepted Answer

A) 39 N 
B) 34 N 
C) 29 N 
D) 44 N 
E) 51 N 
A) 39 N 
B) 34 N 
C) 29 N 
D) 44 N 
E) 51 N E

Question 3

In the figure shown, the coefficient of kinetic friction between the block and the incline is 0.40. What is the magnitude of the acceleration of the suspended block as it falls? Disregard any pulley mass or friction in the pulley.

Accepted Answer

A) 3.4 m/s2 
B) 3.7 m/s2 
C) 4.2 m/s2 
D) 3.9 m/s2 
E) 5.4 m/s2 
A) 3.4 m/s2 
B) 3.7 m/s2 
C) 4.2 m/s2 
D) 3.9 m/s2 
E) 5.4 m/s2 A

Question 4

A 6.0-kg object is suspended by a vertical string from the ceiling of an elevator which is accelerating upward at a rate of 1.8 m/s2. Determine the tension in the string.

Accepted Answer

A) 11 N 
B) 70 N 
C) 48 N 
D) 59 N 
E) 62 N 
A) 11 N 
B) 70 N 
C) 48 N 
D) 59 N 
E) 62 N

Question 5

Two people, each of 70 kg mass, are riding in an elevator. One is standing on the floor. The other is hanging on a rope suspended from the ceiling. Compare the acceleration   of the first person to the acceleration   of the second person. Which statement is correct?

Accepted Answer

A) They are equal and opposite in direction. 
B) They are equal and have the same direction. 
C) The acceleration   is greater than   , but they have the same direction. 
D) The acceleration   is greater than   , but they have opposite directions. 
E) The acceleration   is less than   , but they have the same direction. 
A) They are equal and opposite in direction. 
B) They are equal and have the same direction. 
C) The acceleration   is greater than   , but they have the same direction. 
D) The acceleration   is greater than   , but they have opposite directions. 
E) The acceleration   is less than   , but they have the same direction.

Question 6

An object on the flat bed of a truck that is accelerating along a straight horizontal road. The coefficient of static friction is 0.300 in this case. Of the following choices, which is the lowest value of acceleration that would result in the object sliding on the bed of the truck?

Accepted Answer

A) 0.280 m/s2 
B) 0.310 m/s2 
C) 2.93 m/s2 
D) 2.99 m/s2 
E) 3.02 m/s2 
A) 0.280 m/s2 
B) 0.310 m/s2 
C) 2.93 m/s2 
D) 2.99 m/s2 
E) 3.02 m/s2

Question 7

If α = 40°, β = 60°, and M = 4.0 kg, determine the tension in string 1.

Accepted Answer

A) 15 N 
B) 22 N 
C) 17 N 
D) 20 N 
E) 36 N 
A) 15 N 
B) 22 N 
C) 17 N 
D) 20 N 
E) 36 N

Question 8

At an instant when a 4.0-kg object has an acceleration equal to   m/s2, one of the two forces acting on the object is known to be   N. Determine the magnitude of the other force acting on the object.

Accepted Answer

A) 2.0 N 
B) 13 N 
C) 18 N 
D) 1.7 N 
E) 20 N 
A) 2.0 N 
B) 13 N 
C) 18 N 
D) 1.7 N 
E) 20 N

Question 9

If the tension,   , is 15 N and the magnitude of the acceleration, a, is 3.0 m/s2, what is the mass, m, of the suspended object? Assume that all surfaces and the pulley are frictionless. ​   ​

Accepted Answer

A) 3.1 kg 
B) 2.5 kg 
C) 2.8 kg 
D) 2.2 kg 
E) 3.7 kg 
A) 3.1 kg 
B) 2.5 kg 
C) 2.8 kg 
D) 2.2 kg 
E) 3.7 kg

Question 10

If M = 1.1 kg, what is the tension in string 1?

Accepted Answer

A) 54 N 
B) 47 N 
C) 40 N 
D) 62 N 
E) 57 N 
A) 54 N 
B) 47 N 
C) 40 N 
D) 62 N 
E) 57 N

Question 11

A book is placed on a chair. Then a videocassette is placed on the book. The floor exerts a normal force

Accepted Answer

A) on all three. 
B) only on the book. 
C) only on the chair. 
D) upwards on the chair and downwards on the book. 
E) only on the objects that you have defined to be part of the system. 
A) on all three. 
B) only on the book. 
C) only on the chair. 
D) upwards on the chair and downwards on the book. 
E) only on the objects that you have defined to be part of the system.

Question 12

Two forces are the only forces acting on a 3.0-kg object which moves with an acceleration of 3.0 m/s2 in the positive y direction. If one of the forces acts in the positive x direction and has a magnitude of 8.0 N, what is the magnitude of the other force?

Accepted Answer

A) 12 N 
B) 14 N 
C) 16 N 
D) 18 N 
E) 22 N 
A) 12 N 
B) 14 N 
C) 16 N 
D) 18 N 
E) 22 N

Question 13

Two blocks are accelerated across a horizontal frictionless surface as shown. Frictional forces keep the two blocks from sliding relative to each other, and the two move with the same acceleration. If F = 1.2 N and M = 1.0 kg, what is the horizontal component (frictional force) of the force of the large block on the small block?

Accepted Answer

A) 0.40 N to the left 
B) 0.80 N to the right 
C) 0.40 N to the right 
D) 0.80 N to the left 
E) 1.20 N to the left 
A) 0.40 N to the left 
B) 0.80 N to the right 
C) 0.40 N to the right 
D) 0.80 N to the left 
E) 1.20 N to the left

Question 14

A person weighing 0.70 kN rides in an elevator that has an upward acceleration of 1.5 m/s2. What is the magnitude of the force of the elevator floor on the person?

Accepted Answer

A) 0.11 kN 
B) 0.81 kN 
C) 0.70 kN 
D) 0.59 kN 
E) 0.64 kN 
A) 0.11 kN 
B) 0.81 kN 
C) 0.70 kN 
D) 0.59 kN 
E) 0.64 kN

Question 15

The system shown is released from rest and moves 50 cm in 1.0 s. What is the value of M? All surfaces are frictionless.

Accepted Answer

A) 0.42 kg 
B) 0.34 kg 
C) 0.50 kg 
D) 0.59 kg 
E) 0.68 kg 
A) 0.42 kg 
B) 0.34 kg 
C) 0.50 kg 
D) 0.59 kg 
E) 0.68 kg

Question 16

If M = 2.0 kg, what is the tension in string 1?

Accepted Answer

A) 1.2 N 
B) 11 N 
C) 34 N 
D) 3.5 N 
E) 40 N 
A) 1.2 N 
B) 11 N 
C) 34 N 
D) 3.5 N 
E) 40 N

Question 17

An 8.0-kg object rests on the floor of an elevator which is accelerating downward at a rate of 1.3 m/s2. What is the magnitude of the force the object exerts on the floor of the elevator?

Accepted Answer

A) 59 N 
B) 10 N 
C) 89 N 
D) 68 N 
E) 78 N 
A) 59 N 
B) 10 N 
C) 89 N 
D) 68 N 
E) 78 N

Question 18

A constant force F is applied to a body of mass m that initially is headed east at velocity v0 until its velocity becomes −v0. The total time of travel is 2t. The total distance the body travels in that time is

Accepted Answer

A)    . 
B)    . 
C)    . 
D)    . 
E)    . 
A)    . 
B)    . 
C)    . 
D)    . 
E)    .

Question 19

The only two forces acting on a body have magnitudes of 20 N and 35 N and directions that differ by 80°. The resulting acceleration has a magnitude of 20 m/s2. What is the mass of the body?

Accepted Answer

A) 2.4 kg 
B) 2.2 kg 
C) 2.7 kg 
D) 3.1 kg 
E) 1.5 kg 
A) 2.4 kg 
B) 2.2 kg 
C) 2.7 kg 
D) 3.1 kg 
E) 1.5 kg

Question 20

A 2.0-kg block slides on a rough horizontal surface. A force (magnitude P = 4.0 N) acting parallel to the surface is applied to the block. The magnitude of the block's acceleration is 1.2 m/s2. If P is increased to 5.0 N, determine the magnitude of the block's acceleration.

Accepted Answer

A) 2.1 m/s2 
B) 2.3 m/s2 
C) 1.9 m/s2 
D) 1.7 m/s2 
E) 3.2 m/s2 
A) 2.1 m/s2 
B) 2.3 m/s2 
C) 1.9 m/s2 
D) 1.7 m/s2 
E) 3.2 m/s2

Exam 5: Newtons Laws of Motion

A 1.5-kg mass has an acceleration of . Only two forces act on the mass. If one of the forces is , what is the magnitude of the other force?

If M = 6.0 kg, what is the tension in string 1?

In the figure shown, the coefficient of kinetic friction between the block and the incline is 0.40. What is the magnitude of the acceleration of the suspended block as it falls? Disregard any pulley mass or friction in the pulley.

A 6.0-kg object is suspended by a vertical string from the ceiling of an elevator which is accelerating upward at a rate of 1.8 m/s2. Determine the tension in the string.

Two people, each of 70 kg mass, are riding in an elevator. One is standing on the floor. The other is hanging on a rope suspended from the ceiling. Compare the acceleration of the first person to the acceleration of the second person. Which statement is correct?

An object on the flat bed of a truck that is accelerating along a straight horizontal road. The coefficient of static friction is 0.300 in this case. Of the following choices, which is the lowest value of acceleration that would result in the object sliding on the bed of the truck?

If α = 40°, β = 60°, and M = 4.0 kg, determine the tension in string 1.

At an instant when a 4.0-kg object has an acceleration equal to m/s2, one of the two forces acting on the object is known to be N. Determine the magnitude of the other force acting on the object.

If the tension, , is 15 N and the magnitude of the acceleration, a, is 3.0 m/s2, what is the mass, m, of the suspended object? Assume that all surfaces and the pulley are frictionless. ​ ​

If M = 1.1 kg, what is the tension in string 1?

A book is placed on a chair. Then a videocassette is placed on the book. The floor exerts a normal force

Two forces are the only forces acting on a 3.0-kg object which moves with an acceleration of 3.0 m/s2 in the positive y direction. If one of the forces acts in the positive x direction and has a magnitude of 8.0 N, what is the magnitude of the other force?

A person weighing 0.70 kN rides in an elevator that has an upward acceleration of 1.5 m/s2. What is the magnitude of the force of the elevator floor on the person?

The system shown is released from rest and moves 50 cm in 1.0 s. What is the value of M? All surfaces are frictionless.

If M = 2.0 kg, what is the tension in string 1?

An 8.0-kg object rests on the floor of an elevator which is accelerating downward at a rate of 1.3 m/s2. What is the magnitude of the force the object exerts on the floor of the elevator?

A constant force F is applied to a body of mass m that initially is headed east at velocity v0 until its velocity becomes −v0. The total time of travel is 2t. The total distance the body travels in that time is

The only two forces acting on a body have magnitudes of 20 N and 35 N and directions that differ by 80°. The resulting acceleration has a magnitude of 20 m/s2. What is the mass of the body?

A 2.0-kg block slides on a rough horizontal surface. A force (magnitude P = 4.0 N) acting parallel to the surface is applied to the block. The magnitude of the block's acceleration is 1.2 m/s2. If P is increased to 5.0 N, determine the magnitude of the block's acceleration.

Getting Started

One-Dimensional Motion

Vectors

Two- and Three-Dimensional Motion

Applications of Newtons Laws of Motion

Gravity

Conservation of Energy

Energy in Nonisolated Systems

Systems of Particles and Conservation of Momentum

Collisions

Rotation I: Kinematics and Dynamics

Rotation II: a Conservation Approach

Static Equilibrium, Elasticity, and Fracture

Fluids

Oscillations

Traveling Waves

Superposition and Standing Waves

Temperature, Thermal Expansion, and Gas Laws

Kinetic Theory of Gases

Heat and the First Law of Thermodynamics

Entropy and the Second Law of Thermodynamics

Electric Forces

Electric Fields

Gausss Law

Electric Potential

Capacitors and Batteries

Current and Resistance

Direct Current Dc Circuits

Magnetic Fields and Forces

Gausss Law for Magnetism and Amperes Law

Faradays Law of Induction

Inductors and Ac Circuits

Maxwells Equations and Electromagnetic Waves

Diffraction and Interference

Applications of the Wave Model

Reflection and Images Formed by Reflection

Refraction and Images Formed by Refraction

Relativity

Filters

A 6.0-kg object is suspended by a vertical string from the ceiling of an elevator which is accelerating upward at a rate of 1.8 m/s². Determine the tension in the string.

At an instant when a 4.0-kg object has an acceleration equal to m/s², one of the two forces acting on the object is known to be N. Determine the magnitude of the other force acting on the object.

If the tension, , is 15 N and the magnitude of the acceleration, a, is 3.0 m/s², what is the mass, m, of the suspended object? Assume that all surfaces and the pulley are frictionless.

Two forces are the only forces acting on a 3.0-kg object which moves with an acceleration of 3.0 m/s² in the positive y direction. If one of the forces acts in the positive x direction and has a magnitude of 8.0 N, what is the magnitude of the other force?

A person weighing 0.70 kN rides in an elevator that has an upward acceleration of 1.5 m/s². What is the magnitude of the force of the elevator floor on the person?

An 8.0-kg object rests on the floor of an elevator which is accelerating downward at a rate of 1.3 m/s². What is the magnitude of the force the object exerts on the floor of the elevator?

The only two forces acting on a body have magnitudes of 20 N and 35 N and directions that differ by 80°. The resulting acceleration has a magnitude of 20 m/s². What is the mass of the body?

A 2.0-kg block slides on a rough horizontal surface. A force (magnitude P = 4.0 N) acting parallel to the surface is applied to the block. The magnitude of the block's acceleration is 1.2 m/s². If P is increased to 5.0 N, determine the magnitude of the block's acceleration.