Question 1

If P = 6.0 N,what is the magnitude of the force exerted on block 1 by block 2?

Accepted Answer

A) 6.4 N 
B) 5.6 N 
C) 4.8 N 
D) 7.2 N 
E) 8.4 N 
A) 6.4 N 
B) 5.6 N 
C) 4.8 N 
D) 7.2 N 
E) 8.4 N

Question 2

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 3

If the only forces acting on a 2.0-kg mass are $\overrightarrow { \mathbf { F } } _ { 1 } = ( 3 \hat { \mathbf { i } } - 8 \hat { \mathbf { j } } )$ N and $\overrightarrow { \mathbf { F } } _ { 2 } = ( 5 \hat { \mathbf { i } } + 3 \hat { \mathbf { j } } )$ N,what is the magnitude of the acceleration of the particle?

Accepted Answer

A) 1.5 m/s2 
B) 6.5 m/s2 
C) 4.7 m/s2 
D) 9.4 m/s2 
E) 7.2 m/s2 
A) 1.5 m/s2 
B) 6.5 m/s2 
C) 4.7 m/s2 
D) 9.4 m/s2 
E) 7.2 m/s2

Question 4

A 1.5-kg object has a velocity of 5 ĵ m/s at t = 0.It is accelerated at a constant rate for five seconds after which it has a velocity of (6 î + 12 ĵ)m/s.What is the magnitude of the resultant force acting on the object during this time interval?

Accepted Answer

A) 3.8 N 
B) 3.2 N 
C) 2.8 N 
D) 4.3 N 
E) 4.6 N 
A) 3.8 N 
B) 3.2 N 
C) 2.8 N 
D) 4.3 N 
E) 4.6 N

Question 5

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 6

A catcher arranges to catch a baseball dropped from a height 50 m above his glove.However,his friends substitute a soft 250 g red grapefruit,so that it will smash apart when he catches it.His glove stops the grapefruit in 0.010 s.What force does the glove exert on the grapefruit?

Accepted Answer

A) 0.078 3 N 
B) 783 N 
C) 2 450 N 
D) 24 500 N 
E) 78 300 N 
A) 0.078 3 N 
B) 783 N 
C) 2 450 N 
D) 24 500 N 
E) 78 300 N

Question 7

A 2.0-kg block slides on a frictionless 25$\degree$ 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 8

The diagrams below show forces of magnitude F applied to an equilateral triangular block of uniform thickness.In which diagram(s)is(are)the block in equilibrium?

Accepted Answer

A) A 
B) B 
C) C 
D) D 
E) A and B 
A) A 
B) B 
C) C 
D) D 
E) A and B

Question 9

Two experiments are performed.In (A),an 18.0 N force pushes horizontally on a 2.00 kg block that then pushes on a 4.00 kg block.In (B),an 18.0 N force pushes on a 4.00 kg block that then pushes on a 2.00 kg block.Which statement is correct?

Accepted Answer

A) The acceleration is 3.00 m/s2 in both (
A) and (
B) . 
B) The acceleration is 4.50 m/s2 in both (
A) and (
B) . 
C) The acceleration is 6.00 m/s2 in both (
A) and (
B) . 
D) The acceleration is 9.00 m/s2 in both (
A) and (
B) . 
E) The 2.00 kg block has a 9.00 m/s2 acceleration.The 4.00 kg block has a 4.50 m/s2 acceleration. 
A) The acceleration is 3.00 m/s2 in both (
A) and (
B) . 
B) The acceleration is 4.50 m/s2 in both (
A) and (
B) . 
C) The acceleration is 6.00 m/s2 in both (
A) and (
B) . 
D) The acceleration is 9.00 m/s2 in both (
A) and (
B) . 
E) The 2.00 kg block has a 9.00 m/s2 acceleration.The 4.00 kg block has a 4.50 m/s2 acceleration.

Question 10

The surface of the inclined plane shown is frictionless.If F = 30 N,what is the magnitude of the force exerted on the 3.0-kg block by the 2.0-kg block?

Accepted Answer

A) 18 N 
B) 27 N 
C) 24 N 
D) 21 N 
E) 15 N 
A) 18 N 
B) 27 N 
C) 24 N 
D) 21 N 
E) 15 N

Question 11

If F = 5.0 N,what is the magnitude of the force exerted by block 2 on block 1?

Accepted Answer

A) 17 N 
B) 19 N 
C) 21 N 
D) 23 N 
E) 5.0 N 
A) 17 N 
B) 19 N 
C) 21 N 
D) 23 N 
E) 5.0 N

Question 12

The horizontal surface on which the objects slide is frictionless.If F = 6.0 N and M = 1.0 kg,what is the magnitude of the force exerted on the large block by the small block?

Accepted Answer

A) 7.7 N 
B) 9.8 N 
C) 9.1 N 
D) 8.4 N 
E) 6.5 N 
A) 7.7 N 
B) 9.8 N 
C) 9.1 N 
D) 8.4 N 
E) 6.5 N

Question 13

Two identical springs with spring constant 50 N/m support a 5.0 N weight as in the picture below.What is the tension in spring A?

Accepted Answer

A) 1.45 N 
B) 2.50 N 
C) 2.89 N 
D) 3.75 N 
E) 5.00 N 
A) 1.45 N 
B) 2.50 N 
C) 2.89 N 
D) 3.75 N 
E) 5.00 N

Question 14

The horizontal surface on which the objects slide is frictionless.If M = 1.0 kg and the magnitude of the force of the small block on the large block is 5.2 N,determine F.

Accepted Answer

A) 6.0 N 
B) 9.0 N 
C) 7.8 N 
D) 4.8 N 
E) 4.1 N 
A) 6.0 N 
B) 9.0 N 
C) 7.8 N 
D) 4.8 N 
E) 4.1 N

Question 15

If F = 4.0 N and m = 2.0 kg,what is the magnitude a of the acceleration for the block shown below? The surface is frictionless.

Accepted Answer

A) 5.3 m/s2 
B) 4.4 m/s2 
C) 3.5 m/s2 
D) 6.2 m/s2 
E) 8.4 m/s2 
A) 5.3 m/s2 
B) 4.4 m/s2 
C) 3.5 m/s2 
D) 6.2 m/s2 
E) 8.4 m/s2

Question 16

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 17

The first of two identical boxes of mass m is sitting on level ground.The second box is sitting on a ramp that makes a 20 $\degree$ angle with the ground.The normal force of the level ground on the first box is NL;the normal force of the ramp on the second box is NR.Which statement is correct?

Accepted Answer

A) NR = NL = mg. 
B) NL = mg;NR = mg sin 20 $\degree$. 
C) NL = mg;NR = mg cos 20 $\degree$. 
D) NL = mg;NR = -mg cos 20 $\degree$. 
E) NR = -NL = -mg. 
A) NR = NL = mg. 
B) NL = mg;NR = mg sin 20 $\degree$. 
C) NL = mg;NR = mg cos 20 $\degree$. 
D) NL = mg;NR = -mg cos 20 $\degree$. 
E) NR = -NL = -mg.

Question 18

If F = 40 N and M = 2.0 kg,what is the magnitude of the acceleration of the suspended object? All surfaces are frictionless.

Accepted Answer

A) 1.2 m/s2 
B) 2.0 m/s2 
C) 1.5 m/s2 
D) 2.5 m/s2 
E) 5.6 m/s2 
A) 1.2 m/s2 
B) 2.0 m/s2 
C) 1.5 m/s2 
D) 2.5 m/s2 
E) 5.6 m/s2

Question 19

The three blocks shown are released from rest and are observed to move with accelerations that have a magnitude of 1.5 m/s2.What is the magnitude of the friction force on the block that slides horizontally? Disregard any pulley mass or friction in the pulley and let M = 2.0 kg.

Accepted Answer

A) 6.0 N 
B) 5.1 N 
C) 5.5 N 
D) 4.6 N 
E) 3.7 N 
A) 6.0 N 
B) 5.1 N 
C) 5.5 N 
D) 4.6 N 
E) 3.7 N

Question 20

A 5.0-kg mass is attached to the ceiling of an elevator by a rope whose mass is negligible.What force does the mass exert on the rope when the elevator has an acceleration of 4.0 m/s2 upward?

Accepted Answer

A) 69 N downward 
B) 29 N downward 
C) 49 N downward 
D) 20 N downward 
E) 19 N downward 
A) 69 N downward 
B) 29 N downward 
C) 49 N downward 
D) 20 N downward 
E) 19 N downward

Exam 4: The Laws of Motion

If P = 6.0 N,what is the magnitude of the force exerted on block 1 by block 2?

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

A 1.5-kg object has a velocity of 5 ĵ m/s at t = 0.It is accelerated at a constant rate for five seconds after which it has a velocity of (6 î + 12 ĵ)m/s.What is the magnitude of the resultant force acting on the object during this time interval?

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 catcher arranges to catch a baseball dropped from a height 50 m above his glove.However,his friends substitute a soft 250 g red grapefruit,so that it will smash apart when he catches it.His glove stops the grapefruit in 0.010 s.What force does the glove exert on the grapefruit?

A 2.0-kg block slides on a frictionless 25 °\degree° 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?

The diagrams below show forces of magnitude F applied to an equilateral triangular block of uniform thickness.In which diagram(s)is(are)the block in equilibrium?

Two experiments are performed.In (A),an 18.0 N force pushes horizontally on a 2.00 kg block that then pushes on a 4.00 kg block.In (B),an 18.0 N force pushes on a 4.00 kg block that then pushes on a 2.00 kg block.Which statement is correct?

The surface of the inclined plane shown is frictionless.If F = 30 N,what is the magnitude of the force exerted on the 3.0-kg block by the 2.0-kg block?

If F = 5.0 N,what is the magnitude of the force exerted by block 2 on block 1?

The horizontal surface on which the objects slide is frictionless.If F = 6.0 N and M = 1.0 kg,what is the magnitude of the force exerted on the large block by the small block?

Two identical springs with spring constant 50 N/m support a 5.0 N weight as in the picture below.What is the tension in spring A?

The horizontal surface on which the objects slide is frictionless.If M = 1.0 kg and the magnitude of the force of the small block on the large block is 5.2 N,determine F.

If F = 4.0 N and m = 2.0 kg,what is the magnitude a of the acceleration for the block shown below? The surface is frictionless.

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.

The first of two identical boxes of mass m is sitting on level ground.The second box is sitting on a ramp that makes a 20 °\degree° angle with the ground.The normal force of the level ground on the first box is NL;the normal force of the ramp on the second box is NR.Which statement is correct?

If F = 40 N and M = 2.0 kg,what is the magnitude of the acceleration of the suspended object? All surfaces are frictionless.

The three blocks shown are released from rest and are observed to move with accelerations that have a magnitude of 1.5 m/s2.What is the magnitude of the friction force on the block that slides horizontally? Disregard any pulley mass or friction in the pulley and let M = 2.0 kg.

A 5.0-kg mass is attached to the ceiling of an elevator by a rope whose mass is negligible.What force does the mass exert on the rope when the elevator has an acceleration of 4.0 m/s2 upward?

Introduction and Vectors

Motion in One Dimension

Motion in Two Dimensions

More Applications of Newtons Laws

Energy of a System

Conservation of Energy

Momentum and Collisions

Relativity

Rotational Motion

Gravity,planetary Orbits,and the Hydrogen Atom

Oscillatory Motion

Mechanical Waves

Superposition and Standing Waves

Fluid Mechanics

Temperature and the Kinetic Theory of Gases

Energy in Thermal Processes: the First Law of Thermodynamics

Heat Engines,entropy,and the Second Law of Thermodynamics

Electric Forces and Electric Fields

Electric Potential and Capacitance

Current and Direct Current Circuits

Magnetic Forces and Magnetic Fields

Faradays Law and Inductance

Electromagnetic Waves

Reflection and Refraction of Light

Image Formation by Mirrors and Lenses

Wave Optics

Quantum Physics

Atomic Physics

Nuclear Physics

Particle Physics

Filters

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

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 $\degree$ 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?

The first of two identical boxes of mass m is sitting on level ground.The second box is sitting on a ramp that makes a 20 $\degree$ angle with the ground.The normal force of the level ground on the first box is N_L;the normal force of the ramp on the second box is N_R.Which statement is correct?

The three blocks shown are released from rest and are observed to move with accelerations that have a magnitude of 1.5 m/s².What is the magnitude of the friction force on the block that slides horizontally? Disregard any pulley mass or friction in the pulley and let M = 2.0 kg.

A 5.0-kg mass is attached to the ceiling of an elevator by a rope whose mass is negligible.What force does the mass exert on the rope when the elevator has an acceleration of 4.0 m/s² upward?