Question 1

Given the equation  
,which answer or answers provide(s)the best description of a possible physical situation?

Accepted Answer

A) A 20.00 N tension pulls a 2.00 kg mass.The 2.00 kg mass pulls another 2.00 kg mass. 
B) A 20.00 N force pushes a 2.00 kg mass.The 2.00 kg mass pushes another 2.00 kg mass. 
C) A 2.00 kg mass on a flat surface is acted on by gravity while another 2.00 kg mass sits on top of it. 
D) All of the situations above are possible. 
E) Only (a)and (b)above are possible. 
A) A 20.00 N tension pulls a 2.00 kg mass.The 2.00 kg mass pulls another 2.00 kg mass. 
B) A 20.00 N force pushes a 2.00 kg mass.The 2.00 kg mass pushes another 2.00 kg mass. 
C) A 2.00 kg mass on a flat surface is acted on by gravity while another 2.00 kg mass sits on top of it. 
D) All of the situations above are possible. 
E) Only (a)and (b)above are possible.

Question 2

Exhibit 5-2
A 4.00 kg block is suspended from the roof of an elevator.A 2.00 kg block is suspended from the 4.00 kg block.The tensions in strings 1 and 2 are labeled   and   .   Use this exhibit to answer the following question(s).
-Refer to Exhibit 5-2.When the elevator accelerates downwards with an acceleration of 2.20 m/s2,the magnitudes of  And   Are

Accepted Answer

A) 30.4 N;15.2 N. 
B) 39.2 N;19.6 N. 
C) 45.6 N;15.2 N. 
D) 48.0 N;24.0 N. 
E) 72.0 N;24.0 N. 
A) 30.4 N;15.2 N. 
B) 39.2 N;19.6 N. 
C) 45.6 N;15.2 N. 
D) 48.0 N;24.0 N. 
E) 72.0 N;24.0 N.

Question 3

When an acrobat hangs motionless from a pair of rings

Accepted Answer

A) she has no measurable weight. 
B) her weight depends on the angles the ropes make with the ceiling. 
C) her weight is reduced by the upward force the rings exert on her. 
D) her weight is increased by the upward force the rings exert on her. 
E) she exerts a gravitational force on the Earth that is equal to the sum of the forces the rings exert on her. 
A) she has no measurable weight. 
B) her weight depends on the angles the ropes make with the ceiling. 
C) her weight is reduced by the upward force the rings exert on her. 
D) her weight is increased by the upward force the rings exert on her. 
E) she exerts a gravitational force on the Earth that is equal to the sum of the forces the rings exert on her.

Question 4

A heavy weight is supported by two cables that exert tensions of magnitude T1 and T2.Which statement is correct?

Accepted Answer

A) T1 = T2. 
B) T1y = T2y. 
C) T1 > T2. 
D) T1 2. 
E) We need the mass of the box in order to determine the correct answer. 
A) T1 = T2. 
B) T1y = T2y. 
C) T1 > T2. 
D) T1 2. 
E) We need the mass of the box in order to determine the correct answer.

Question 5

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 6

A 5.0-kg mass sits on the floor of an elevator that has a downward acceleration of 1.0 m/s2.On top of the 5.0-kg mass is an object of unknown mass.The force of the elevator on the 5.0-kg mass is 80 N up.Determine the unknown mass.

Accepted Answer

A) 3.3 kg 
B) 2.4 kg 
C) 1.6 kg 
D) 4.1 kg 
E) 5.0 kg 
A) 3.3 kg 
B) 2.4 kg 
C) 1.6 kg 
D) 4.1 kg 
E) 5.0 kg

Question 7

A bumper car is moving at constant velocity when another bumper car starts to push on it with a constant force at an angle of 60 degrees with respect to the first car's initial velocity.The second bumper car continues pushing in exactly that direction for some time.What is most likely to happen is that

Accepted Answer

A) the first car will stop moving. 
B) the first car will move in the direction of the force. 
C) the first car's velocity will increase in magnitude but not change direction. 
D) the first car's velocity will gradually change direction more and more toward that of the force while increasing in magnitude. 
E) the first car's velocity will gradually change direction more and more toward that of the force while decreasing in magnitude. 
A) the first car will stop moving. 
B) the first car will move in the direction of the force. 
C) the first car's velocity will increase in magnitude but not change direction. 
D) the first car's velocity will gradually change direction more and more toward that of the force while increasing in magnitude. 
E) the first car's velocity will gradually change direction more and more toward that of the force while decreasing in magnitude.

Question 8

A 2.0-kg block slides on a frictionless 25° inclined plane.A force of 4.6 N acting parallel to the incline and up the incline is applied to the block.What is the acceleration of the block?

Accepted Answer

A) 1.8 m/s2 up the incline 
B) 2.3 m/s2 up the incline 
C) 6.6 m/s2 down the incline 
D) 1.8 m/s2 down the incline 
E) 2.3 m/s2 down the incline 
A) 1.8 m/s2 up the incline 
B) 2.3 m/s2 up the incline 
C) 6.6 m/s2 down the incline 
D) 1.8 m/s2 down the incline 
E) 2.3 m/s2 down the incline

Question 9

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

Question 10

The total force needed to drag a box at constant speed across a surface with coefficient of kinetic friction μk is least when the force is applied at an angle θ such that

Accepted Answer

A) sinθ = μk. 
B) cosθ = μk. 
C) tanθ = μk. 
D) cotθ = μk. 
E) secθ = μk. 
A) sinθ = μk. 
B) cosθ = μk. 
C) tanθ = μk. 
D) cotθ = μk. 
E) secθ = μk.

Question 11

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 12

An object of unknown weight is suspended as shown.The tension in rope 1 is 25 lb,and the tension in rope 2 is 31 lb.What is the weight of the suspended object?

Accepted Answer

A) 36 lb 
B) 33 lb 
C) 41 lb 
D) 39 lb 
E) 56 lb 
A) 36 lb 
B) 33 lb 
C) 41 lb 
D) 39 lb 
E) 56 lb

Question 13

A 1.5-kg mass has an acceleration of (4.0  
− 3)0  
)m/s2.Only two forces act on the mass.If one of the forces is (2.0  
− 1)4  
)N,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

Question 14

A 4.0-kg block slides down a 35° incline at a constant speed when a 16-N force is applied acting up and parallel to the incline.What is the coefficient of kinetic friction between the block and the surface of the incline?

Accepted Answer

A) 0.20 
B) 0.23 
C) 0.26 
D) 0.33 
E) 0.41 
A) 0.20 
B) 0.23 
C) 0.26 
D) 0.33 
E) 0.41

Question 15

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 16

If α = 40° and the tension in string 2 is 30 N,determine M.

Accepted Answer

A) 3.4 kg 
B) 3.6 kg 
C) 2.6 kg 
D) 4.9 kg 
E) 7.5 kg 
A) 3.4 kg 
B) 3.6 kg 
C) 2.6 kg 
D) 4.9 kg 
E) 7.5 kg

Question 17

A 4.0-kg block is pushed up a 36° incline by a force of magnitude P applied parallel to the incline.When P is 31 N,it is observed that the block moves up the incline with a constant speed.What value of P would be required to lower the block down the incline at a constant speed?

Accepted Answer

A) 27 N 
B) 15 N 
C) 13 N 
D) 17 N 
E) 19 N 
A) 27 N 
B) 15 N 
C) 13 N 
D) 17 N 
E) 19 N

Question 18

A 2.0-kg block slides on a frictionless 15° inclined plane.A force acting parallel to the incline is applied to the block.The acceleration of the block is 1.5 m/s2 down the incline.What is the applied force?

Accepted Answer

A) 8.1 N down the incline 
B) 3.0 N down the incline 
C) 2.1 N up the incline 
D) 3.0 N up the incline 
E) 8.1 N up the incline 
A) 8.1 N down the incline 
B) 3.0 N down the incline 
C) 2.1 N up the incline 
D) 3.0 N up the incline 
E) 8.1 N up the incline

Question 19

The horizontal surface on which the objects slide is frictionless.If M = 2.0 kg,the tension in string 1 is 12 N.Determine F.

Accepted Answer

A) 25 N 
B) 20 N 
C) 30 N 
D) 35 N 
E) 40 N 
A) 25 N 
B) 20 N 
C) 30 N 
D) 35 N 
E) 40 N

Question 20

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

Exam 5: The Laws of Motion

Given the equation ,which answer or answers provide(s)the best description of a possible physical situation?

When an acrobat hangs motionless from a pair of rings

A heavy weight is supported by two cables that exert tensions of magnitude T1 and T2.Which statement is correct?

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 5.0-kg mass sits on the floor of an elevator that has a downward acceleration of 1.0 m/s2.On top of the 5.0-kg mass is an object of unknown mass.The force of the elevator on the 5.0-kg mass is 80 N up.Determine the unknown mass.

A 2.0-kg block slides on a frictionless 25° inclined plane.A force of 4.6 N acting parallel to the incline and up the incline is applied to the block.What is the acceleration of the block?

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.

The total force needed to drag a box at constant speed across a surface with coefficient of kinetic friction μk is least when the force is applied at an angle θ such that

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.

An object of unknown weight is suspended as shown.The tension in rope 1 is 25 lb,and the tension in rope 2 is 31 lb.What is the weight of the suspended object?

A 1.5-kg mass has an acceleration of (4.0 − 3)0 )m/s2.Only two forces act on the mass.If one of the forces is (2.0 − 1)4 )N,what is the magnitude of the other force?

A 4.0-kg block slides down a 35° incline at a constant speed when a 16-N force is applied acting up and parallel to the incline.What is the coefficient of kinetic friction between the block and the surface of the incline?

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

If α = 40° and the tension in string 2 is 30 N,determine M.

A 4.0-kg block is pushed up a 36° incline by a force of magnitude P applied parallel to the incline.When P is 31 N,it is observed that the block moves up the incline with a constant speed.What value of P would be required to lower the block down the incline at a constant speed?

A 2.0-kg block slides on a frictionless 15° inclined plane.A force acting parallel to the incline is applied to the block.The acceleration of the block is 1.5 m/s2 down the incline.What is the applied force?

The horizontal surface on which the objects slide is frictionless.If M = 2.0 kg,the tension in string 1 is 12 N.Determine F.

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?

Physics and Measurement

Motion in One Dimension

Vectors

Motion in Two Dimensions

Circular Motion and Other Applications of Newtons Laws

Energy of a System

Conservation of Energy

Linear Momentum and Collisions

Rotation of a Rigid Object About a Fixed Axis

Angular Momentum

Static Equilibrium and Elasticity

Universal Gravitation

Fluid Mechanics

Oscillatory Motion

Wave Motion

Sound Waves

Superposition and Standing Waves

Temperature

The First Law of Thermodynamics

The Kinetic Theory of Gases

Heat Engines, entropy, and the Second Law of Thermodynamics

Electric Fields

Gausss Law

Electric Potential

Capacitance and Dielectrics

Current and Resistance

Direct-Current Circuits

Magnetic Fields

Sources of the Magnetic Field

Faradays Law

Inductance

Alternating-Current Circuits

Electromagnetic Waves

The Nature of Light and the Principles of Ray Optics

Image Formation

Wave Optics

Diffraction Patterns and Polarization

Relativity

Introduction to Quantum Physics

Quantum Mechanics

Atomic Physics

Molecules and Solids

Nuclear Structure

Applications of Nuclear Physics

Particle Physics and Cosmology

Filters

A heavy weight is supported by two cables that exert tensions of magnitude T₁ and T₂.Which statement is correct?

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 5.0-kg mass sits on the floor of an elevator that has a downward acceleration of 1.0 m/s².On top of the 5.0-kg mass is an object of unknown mass.The force of the elevator on the 5.0-kg mass is 80 N up.Determine the unknown mass.

The total force needed to drag a box at constant speed across a surface with coefficient of kinetic friction μ_k is least when the force is applied at an angle θ such that

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.

A 1.5-kg mass has an acceleration of (4.0 − 3)0 )m/s².Only two forces act on the mass.If one of the forces is (2.0 − 1)4 )N,what is the magnitude of the other force?

A 2.0-kg block slides on a frictionless 15° inclined plane.A force acting parallel to the incline is applied to the block.The acceleration of the block is 1.5 m/s² down the incline.What is the applied force?

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?