Question 1

Which of the following is not a fundamental force?

Accepted Answer

A) the gravitational force 
B) the electromagnetic force 
C) the strong force 
D) the force of forward motion also known as the inertial force 
E) Choose this answer if two of the named forces are not fundamental. 
A) the gravitational force 
B) the electromagnetic force 
C) the strong force 
D) the force of forward motion also known as the inertial force 
E) Choose this answer if two of the named forces are not fundamental.

Question 2

A 5.0-kg object is suspended by a string from the ceiling of an elevator that is accelerating downward at a rate of 2.6 m/s2.What is the tension in the string?

Accepted Answer

A) 49 N 
B) 36 N 
C) 62 N 
D) 13 N 
E) 52 N 
A) 49 N 
B) 36 N 
C) 62 N 
D) 13 N 
E) 52 N

Question 3

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 4

A 60-kg person rides down an icy hill of 20° slope while standing on a 3.0-kg flat-bottomed bathroom scale.Assume there is no frictional force between the bottom of the scale and the hill.The static friction force the scale exerts on the person is

Accepted Answer

A) 0 N. 
B) 201 N. 
C) 211 N. 
D) 553 N. 
E) 580 N. 
A) 0 N. 
B) 201 N. 
C) 211 N. 
D) 553 N. 
E) 580 N.

Question 5

Three boxes slide on a frictionless horizontal surface when pulled by a force of magnitude F.When we compare the tensions T1 and T2 with the force F,we find that

Accepted Answer

A) T1 = T2 = F. 
B) T1 = F > T2. 
C) F > T1 = T2. 
D) F > T1 > T2. 
E) F − T1 1 − T2. 
A) T1 = T2 = F. 
B) T1 = F > T2. 
C) F > T1 = T2. 
D) F > T1 > T2. 
E) F − T1 1 − T2.

Question 6

You throw a ball up in the air and hold your hand under it to catch it when it comes down.The reason why the ball stops is because

Accepted Answer

A) your hand is there: your hand exerts no force on the ball. 
B) your hand exerts a force on the ball perpendicular to its velocity. 
C) your hand exerts a force on the ball in the direction of its velocity. 
D) your hand exerts a force on the ball in the direction opposite to its velocity. 
E) your hand and the ball exert forces in the same direction on each other. 
A) your hand is there: your hand exerts no force on the ball. 
B) your hand exerts a force on the ball perpendicular to its velocity. 
C) your hand exerts a force on the ball in the direction of its velocity. 
D) your hand exerts a force on the ball in the direction opposite to its velocity. 
E) your hand and the ball exert forces in the same direction on each other.

Question 7

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 8

A block is pushed up a frictionless 30° incline by an applied force as shown.If F = 25 N and M = 3.0 kg,what is the magnitude of the resulting acceleration of the block?

Accepted Answer

A) 2.3 m/s2 
B) 4.6 m/s2 
C) 3.5 m/s2 
D) 2.9 m/s2 
E) 5.1 m/s2 
A) 2.3 m/s2 
B) 4.6 m/s2 
C) 3.5 m/s2 
D) 2.9 m/s2 
E) 5.1 m/s2

Question 9

A 2000-kg sailboat experiences an eastward force of 3000 N by the ocean tide and a wind force against its sails of magnitude 6000 N directed toward the northwest (45° N of W).What is the magnitude and direction of the resultant acceleration?

Accepted Answer

2.2 m/s² at

Question 10

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 11

The vector sum of three co-planar forces

Accepted Answer

A) must be zero. 
B) must be perpendicular to one of the three. 
C) must be parallel to one of the three. 
D) must be perpendicular to the plane. 
E) may have any direction in the plane. 
A) must be zero. 
B) must be perpendicular to one of the three. 
C) must be parallel to one of the three. 
D) must be perpendicular to the plane. 
E) may have any direction in the plane.

Question 12

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

Question 13

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° 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°. 
C) NL = mg;NR = mg cos 20°. 
D) NL = mg;NR = −mg cos 20°. 
E) NR = −NL = −mg. 
A) NR = NL = mg. 
B) NL = mg;NR = mg sin 20°. 
C) NL = mg;NR = mg cos 20°. 
D) NL = mg;NR = −mg cos 20°. 
E) NR = −NL = −mg.

Exam 5: The Laws of Motion

Which of the following is not a fundamental force?

A 5.0-kg object is suspended by a string from the ceiling of an elevator that is accelerating downward at a rate of 2.6 m/s2.What is 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?

A 60-kg person rides down an icy hill of 20° slope while standing on a 3.0-kg flat-bottomed bathroom scale.Assume there is no frictional force between the bottom of the scale and the hill.The static friction force the scale exerts on the person is

Three boxes slide on a frictionless horizontal surface when pulled by a force of magnitude F.When we compare the tensions T1 and T2 with the force F,we find that

You throw a ball up in the air and hold your hand under it to catch it when it comes down.The reason why the ball stops is because

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.

A block is pushed up a frictionless 30° incline by an applied force as shown.If F = 25 N and M = 3.0 kg,what is the magnitude of the resulting acceleration of the block?

A 2000-kg sailboat experiences an eastward force of 3000 N by the ocean tide and a wind force against its sails of magnitude 6000 N directed toward the northwest (45° N of W).What is the magnitude and direction of the resultant acceleration?

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?

The vector sum of three co-planar forces

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

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° 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?

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

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A 5.0-kg object is suspended by a string from the ceiling of an elevator that is accelerating downward at a rate of 2.6 m/s².What is the tension in the string?

Three boxes slide on a frictionless horizontal surface when pulled by a force of magnitude F.When we compare the tensions T₁ and T₂ with the force F,we find that

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° 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?