Question 1

If the graph of the position as a function of time for an object is a horizontal line,that object cannot be accelerating.

Accepted Answer

A) True 
 B)False  True

Question 2

The figure shows the position of an object as a function of time,with all numbers accurate to two significant figures.Between time   and time   (a)what is the average speed of the object?
(b)what is the average velocity of the object?

Accepted Answer

(a)0.56 m/s (b)0.11 m/s

Question 3

The position of an object as a function of time is given by x =   - ct,where   and   and x and t are in SI units.What is the instantaneous velocity of the object when

Accepted Answer

A)  1.7 m/s 
B)  2.1 m/s 
C)  2.3 m/s 
D)  2.7 m/s 
A)  1.7 m/s 
B)  2.1 m/s 
C)  2.3 m/s 
D)  2.7 m/s B

Question 4

The graph in the figure shows the position of an object as a function of time.The letters H-L represent particular moments of time.At which moments shown (H,I,etc.)is the speed of the object
(a)the greatest?
(b)the smallest?

Accepted Answer

The answer of The graph in the figure shows the...

Question 5

A rocket takes off vertically from the launchpad with no initial velocity but a constant upward acceleration of 2.25 m/s2.At 15.4 s after blastoff,the engines fail completely so the only force on the rocket from then on is the pull of gravity.
(a)What is the maximum height the rocket will reach above the launchpad?
(b)How fast is the rocket moving at the instant before it crashes onto the launchpad?
(c)How long after engine failure does it take for the rocket to crash onto the launchpad?

Accepted Answer

(a)328 m (

Question 6

A toy rocket is launched vertically from ground level   ,at time   .The rocket engine provides constant upward acceleration during the burn phase.At the instant of engine burnout,the rocket has risen to 72 m and acquired a velocity of   The rocket continues to rise in unpowered flight,reaches maximum height,and falls back to the ground with negligible air resistance.The speed of the rocket upon impact on the ground is closest to

Accepted Answer

A)  48 m/s. 
B)  44 m/s. 
C)  39 m/s. 
D)  54 m/s. 
E)  59 m/s. 
A)  48 m/s. 
B)  44 m/s. 
C)  39 m/s. 
D)  54 m/s. 
E)  59 m/s.

Question 7

A ball is projected upward at time t = 0.0 s,from a point on a roof 90 m above the ground.The ball rises,then falls and strikes the ground.The initial velocity of the ball is   if air resistance is negligible.The time when the ball strikes the ground is closest to

Accepted Answer

A)  9.4 s. 
B)  9.0 s. 
C)  8.7 s. 
D)  9.7 s. 
E)  10 s. 
A)  9.4 s. 
B)  9.0 s. 
C)  8.7 s. 
D)  9.7 s. 
E)  10 s.

Question 8

A airplane that is flying level needs to accelerate from a speed of   to a speed of   while it flies a distance of 1.20 km.What must be the acceleration of the plane?

Accepted Answer

A)  4.44 m/s2 
B)  2.45 m/s2 
C)  7.33 m/s2 
D)  5.78 m/s2 
E)  1.34 m/s2 
A)  4.44 m/s2 
B)  2.45 m/s2 
C)  7.33 m/s2 
D)  5.78 m/s2 
E)  1.34 m/s2

Question 9

An object starts its motion with a constant velocity of 2.0 m/s toward the east.After 3.0 s,the object stops for 1.0 s.The object then moves toward the west a distance of 2.0 m in 3.0 s.The object continues traveling in the same direction,but increases its speed by 1.0 m/s for the next 2.0 s.Which graph below could represent the motion of this object?

Accepted Answer

A)    
B)    
C)    
D)    
A)    
B)    
C)    
D)

Question 10

Two objects are thrown from the top of a tall building and experience no appreciable air resistance.One is thrown up,and the other is thrown down,both with the same initial speed.What are their speeds when they hit the street?

Accepted Answer

A)  The one thrown up is traveling faster. 
B)  The one thrown down is traveling faster. 
C)  They are traveling at the same speed. 
A)  The one thrown up is traveling faster. 
B)  The one thrown down is traveling faster. 
C)  They are traveling at the same speed.

Question 11

An object is moving in a straight line along the x-axis.A plot of its velocity in the x direction as a function of time is shown in the figure.Which graph represents its acceleration in the x direction as a function of time?

Accepted Answer

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

Question 12

A soccer ball is released from rest at the top of a grassy incline.After 8.6 seconds,the ball travels 87 meters and 1.0 s after this,the ball reaches the bottom of the incline.
(a)What was the magnitude of the ball's acceleration,assume it to be constant?
(b)How long was the incline?

Accepted Answer

The answer of A soccer ball is released from rest...

Question 13

The figure shows the position of an object (moving along a straight line)as a function of time.Assume two significant figures in each number.Which of the following statements about this object is true over the interval shown?

Accepted Answer

A)  The object is accelerating to the left. 
B)  The object is accelerating to the right. 
C)  The acceleration of the object is in the same direction as its velocity. 
D)  The average speed of the object is 1.0 m/s. 
A)  The object is accelerating to the left. 
B)  The object is accelerating to the right. 
C)  The acceleration of the object is in the same direction as its velocity. 
D)  The average speed of the object is 1.0 m/s.

Question 14

An object is moving with constant non-zero acceleration along the +x-axis.A graph of the velocity in the x direction as a function of time for this object is

Accepted Answer

A)  a horizontal straight line. 
B)  a vertical straight line. 
C)  a straight line making an angle with the time axis. 
D)  a parabolic curve. 
A)  a horizontal straight line. 
B)  a vertical straight line. 
C)  a straight line making an angle with the time axis. 
D)  a parabolic curve.

Question 15

When can we be certain that the average velocity of an object is always equal to its instantaneous velocity?

Accepted Answer

A)  always 
B)  never 
C)  only when the velocity is constant 
D)  only when the acceleration is constant 
E)  only when the acceleration is changing at a constant rate 
A)  always 
B)  never 
C)  only when the velocity is constant 
D)  only when the acceleration is constant 
E)  only when the acceleration is changing at a constant rate

Question 16

An object starts from rest at time t = 0.00 s and moves in the +x direction with constant acceleration.The object travels 12.0 m from time t = 1.00 s to time   .What is the acceleration of the object?

Accepted Answer

A)  -12.0 m/s2 
B)  24.0 m/s2 
C)  -4.00 m/s2 
D)  4.00 m/s2 
E)  8.00 m/s2 
A)  -12.0 m/s2 
B)  24.0 m/s2 
C)  -4.00 m/s2 
D)  4.00 m/s2 
E)  8.00 m/s2

Question 17

The position of an object is given by   where       and x and t are in SI units.What is the instantaneous acceleration of the object when

Accepted Answer

A)  -13 m/s2 
B)  2.9 m/s2 
C)  4.6 m/s2 
D)  13 m/s2 
A)  -13 m/s2 
B)  2.9 m/s2 
C)  4.6 m/s2 
D)  13 m/s2

Question 18

A racing car accelerates uniformly from rest along a straight track.This track has markers spaced at equal distances along it from the start,as shown in the figure.The car reaches a speed of 140 km/h as it passes marker 2.Where on the track was the car when it was traveling at 70 km/h?

Accepted Answer

A)  before marker 1 
B)  at marker 1 
C)  between marker 1 and marker 2 
A)  before marker 1 
B)  at marker 1 
C)  between marker 1 and marker 2

Question 19

A speeding car is traveling at a constant 30.0 m/s when it passes a stationary police car.If the police car delays for 1.00 s before starting,what must be the magnitude of the constant acceleration of the police car to catch the speeding car after the police car travels a distance of 300 m?

Accepted Answer

A)  6.00 m/s2 
B)  3.00 m/s2 
C)  7.41 m/s2 
D)  1.45 m/s2 
E)  3.70 m/s2 
A)  6.00 m/s2 
B)  3.00 m/s2 
C)  7.41 m/s2 
D)  1.45 m/s2 
E)  3.70 m/s2

Question 20

A ball is projected upward at time t = 0.00 s,from a point on a roof 70 m above the ground and experiences negligible air resistance.The ball rises,then falls and strikes the ground.The initial velocity of the ball is   Consider all quantities as positive in the upward direction.The velocity of the ball when it is   above the ground is closest to

Accepted Answer

A)  -38 m/s. 
B)  -30 m/s. 
C)  -23 m/s. 
D)  -15 m/s. 
E)  -45 m/s. 
A)  -38 m/s. 
B)  -30 m/s. 
C)  -23 m/s. 
D)  -15 m/s. 
E)  -45 m/s.

Exam 2: Motion Along a Straight Line

If the graph of the position as a function of time for an object is a horizontal line,that object cannot be accelerating.

The figure shows the position of an object as a function of time,with all numbers accurate to two significant figures.Between time and time (a)what is the average speed of the object? (b)what is the average velocity of the object?

The position of an object as a function of time is given by x = - ct,where and and x and t are in SI units.What is the instantaneous velocity of the object when

The graph in the figure shows the position of an object as a function of time.The letters H-L represent particular moments of time.At which moments shown (H,I,etc.)is the speed of the object (a)the greatest? (b)the smallest?

A ball is projected upward at time t = 0.0 s,from a point on a roof 90 m above the ground.The ball rises,then falls and strikes the ground.The initial velocity of the ball is if air resistance is negligible.The time when the ball strikes the ground is closest to

A airplane that is flying level needs to accelerate from a speed of to a speed of while it flies a distance of 1.20 km.What must be the acceleration of the plane?

Two objects are thrown from the top of a tall building and experience no appreciable air resistance.One is thrown up,and the other is thrown down,both with the same initial speed.What are their speeds when they hit the street?

An object is moving in a straight line along the x-axis.A plot of its velocity in the x direction as a function of time is shown in the figure.Which graph represents its acceleration in the x direction as a function of time?

A soccer ball is released from rest at the top of a grassy incline.After 8.6 seconds,the ball travels 87 meters and 1.0 s after this,the ball reaches the bottom of the incline. (a)What was the magnitude of the ball's acceleration,assume it to be constant? (b)How long was the incline?

The figure shows the position of an object (moving along a straight line)as a function of time.Assume two significant figures in each number.Which of the following statements about this object is true over the interval shown?

An object is moving with constant non-zero acceleration along the +x-axis.A graph of the velocity in the x direction as a function of time for this object is

When can we be certain that the average velocity of an object is always equal to its instantaneous velocity?

An object starts from rest at time t = 0.00 s and moves in the +x direction with constant acceleration.The object travels 12.0 m from time t = 1.00 s to time .What is the acceleration of the object?

The position of an object is given by where and x and t are in SI units.What is the instantaneous acceleration of the object when

A racing car accelerates uniformly from rest along a straight track.This track has markers spaced at equal distances along it from the start,as shown in the figure.The car reaches a speed of 140 km/h as it passes marker 2.Where on the track was the car when it was traveling at 70 km/h?

A speeding car is traveling at a constant 30.0 m/s when it passes a stationary police car.If the police car delays for 1.00 s before starting,what must be the magnitude of the constant acceleration of the police car to catch the speeding car after the police car travels a distance of 300 m?

Units,physical Quantities,and Vectors

Motion in Two or Three Dimensions

Newtons Laws of Motion

Applying Newtons Laws

Work and Kinetic Energy

Potential Energy and Energy Conservation

Momentum,impulse,and Collisions

Rotation of Rigid Bodies

Dynamics of Rotational Motion

Equilibrium and Elasticity

Fluid Mechanics

Gravitation

Periodic Motion

Mechanical Waves

Sound and Hearing

Temperature and Heat

Thermal Properties of Matter

The First Law of Thermodynamics

The Second Law of Thermodynamics

Electric Charge and Electric Field

Gausss Law

Electric Potential

Capacitance and Dielectrics

Current,resistance,and Electromotive Force

Direct-Current Circuits

Magnetic Field and Magnetic Forces

Sources of Magnetic Field

Electromagnetic Induction

Inductance

Alternating Current

Electromagnetic Waves

The Nature and Propagation of Light

Geometric Optics

Interference

Diffraction

Relativity

Photons: Light Waves Behaving As Particles

Particles Behaving As Waves

Quantum Mechanics

Atomic Structure

Molecules and Condensed Matter

Nuclear Physics

Particle Physics and Cosmology

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