Question 1

Jeff throws a ball straight up.For which situation is the vertical velocity zero?

Accepted Answer

A)  on the way up 
B)  at the top 
C)  on the way back down 
D)  none of the above 
A)  on the way up 
B)  at the top 
C)  on the way back down 
D)  none of the above

Question 2

A strobe photograph of a car moving along a straight road shows the interval between each successive image to be diminishing.If the direction of motion of the car is taken as positive,which of the following are negative?

Accepted Answer

A)  the speed of the car 
B)  the average velocity of the car 
C)  the average acceleration of the car 
D)  all of the above 
A)  the speed of the car 
B)  the average velocity of the car 
C)  the average acceleration of the car 
D)  all of the above

Question 3

A European sports car dealer claims that his product will accelerate at a constant rate from rest to a speed of 100 km/hr in 8.00 s.What is the speed after the first 5.00 s of acceleration? (Hint: First convert the speed to m/s. )
​

Accepted Answer

A)  34.8 m/s 
B)  52.2 m/s 
C)  26.1 m/s 
D)  17.4 m/s 
E)  ​8.7 m/s 
A)  34.8 m/s 
B)  52.2 m/s 
C)  26.1 m/s 
D)  17.4 m/s 
E)  ​8.7 m/s

Question 4

A baseball catcher throws a ball vertically upward and catches it in the same spot when it returns to his mitt.At what point in the ball's path does it experience zero velocity and non-zero acceleration at the same time?

Accepted Answer

A)  midway on the way up 
B)  at the top of its trajectory 
C)  the instant it leaves the catcher's hand 
D)  the instant before it arrives in the catcher's mitt 
A)  midway on the way up 
B)  at the top of its trajectory 
C)  the instant it leaves the catcher's hand 
D)  the instant before it arrives in the catcher's mitt

Question 5

An object moves 20 m east in 20 s and then returns to its starting point taking an additional 60 s.If west is chosen as the positive direction,what is the average speed of the object?

Accepted Answer

A)  0.5 m/s 
B)  -0.5 m/s 
C)  8 m/s 
D)  0 m/s 
E)  ​-8 
A)  0.5 m/s 
B)  -0.5 m/s 
C)  8 m/s 
D)  0 m/s 
E)  ​-8

Question 6

Changing the positive direction in a reference frame to the opposite direction does not change the sign of which of the following quantities?

Accepted Answer

A)  velocity 
B)  average velocity 
C)  speed 
D)  displacement 
A)  velocity 
B)  average velocity 
C)  speed 
D)  displacement

Question 7

A rock is thrown straight up with an initial velocity of 24.9 m/s.What maximum height will the rock reach before starting to fall downward? (Take acceleration due to gravity as 9.80 m/s2. )
​

Accepted Answer

A)  39.5 m 
B)  15.8 m 
C)  63.2 m 
D)  31.6 m 
E)  ​47.4 m 
A)  39.5 m 
B)  15.8 m 
C)  63.2 m 
D)  31.6 m 
E)  ​47.4 m

Question 8

A ball is thrown vertically upwards at 19.6 m/s.For its complete trip (up and back down to the starting position),its average speed is:
​

Accepted Answer

A)  14.7 m/s. 
B)  9.8 m/s. 
C)  19.6 m/s. 
D)  ​4.9 m/s. 
E)  ​not given. 
A)  14.7 m/s. 
B)  9.8 m/s. 
C)  19.6 m/s. 
D)  ​4.9 m/s. 
E)  ​not given.

Question 9

The value of an object's acceleration may be characterized in equivalent words by which of the following?

Accepted Answer

A)  displacement 
B)  rate of change of displacement 
C)  velocity 
D)  rate of change of velocity 
A)  displacement 
B)  rate of change of displacement 
C)  velocity 
D)  rate of change of velocity

Question 10

Mt.Everest is more than 8 000 m high.How fast would an object be moving if it could free fall to sea level after being released from an 8000-m elevation? (Ignore air resistance. )

Accepted Answer

A)  396 m/s 
B)  120 m/s 
C)  1 200 m/s 
D)  12 000 m/s 
A)  396 m/s 
B)  120 m/s 
C)  1 200 m/s 
D)  12 000 m/s

Question 11

If the displacement of an object is given in SI units by Δx = −3 t + 4 t 2,at t = 2 s its velocity and acceleration are,respectively:

Accepted Answer

A)  positive,positive. 
B)  positive,negative. 
C)  negative,negative. 
D)  negative,positive. 
A)  positive,positive. 
B)  positive,negative. 
C)  negative,negative. 
D)  negative,positive.

Question 12

In one-dimensional motion,the average speed of an object that moves from one place to another and then back to its original place has which of the following properties?

Accepted Answer

A)  It is positive. 
B)  It is negative. 
C)  It is zero. 
D)  It can be positive,negative,or zero. 
A)  It is positive. 
B)  It is negative. 
C)  It is zero. 
D)  It can be positive,negative,or zero.

Question 13

In the case of constant acceleration,the average velocity equals the instantaneous velocity:

Accepted Answer

A)  at the beginning of the time interval. 
B)  at the end of the time interval. 
C)  half-way through the time interval. 
D)  three-fourths of the way through the time interval. 
A)  at the beginning of the time interval. 
B)  at the end of the time interval. 
C)  half-way through the time interval. 
D)  three-fourths of the way through the time interval.

Question 14

A ball is pushed with an initial velocity of 4.0 m/s.The ball rolls down a hill with a constant acceleration of 1.4 m/s2.The ball reaches the bottom of the hill in 4.0 s.What is the ball's velocity at the bottom of the hill?

Accepted Answer

A)  5 m/s 
B)  7 m/s 
C)  8 m/s 
D)  10 m/s 
E)  ​13 m/s 
A)  5 m/s 
B)  7 m/s 
C)  8 m/s 
D)  10 m/s 
E)  ​13 m/s

Question 15

A rock is thrown straight down with an initial velocity of 14.5 m/s from a cliff.What is the rock's displacement after 2.0 s? (Acceleration due to gravity is 9.80 m/s2. )

Accepted Answer

A)  68 m 
B)  49 m 
C)  39 m 
D)  22 m 
E)  ​31 m 
A)  68 m 
B)  49 m 
C)  39 m 
D)  22 m 
E)  ​31 m

Question 16

A vehicle designed to operate on a drag strip accelerates from zero to 28 m/s while undergoing a straight line path displacement of 48 m.What is the vehicle's acceleration if its value may be assumed to be constant?
​

Accepted Answer

A)  6 m/s2 
B)  4 m/s2 
C)  8 m/s2 
D)  12 m/s2 
E)  16 m/s2 
A)  6 m/s2 
B)  4 m/s2 
C)  8 m/s2 
D)  12 m/s2 
E)  16 m/s2

Question 17

A European sports car dealer claims that his car will accelerate at a constant rate from rest to 100 km/hr in 9 s.If so,what is the acceleration? (Hint: First convert speed to m/s. )
​

Accepted Answer

A)  3.09 m/s2 
B)  6.18 m/s2 
C)  4.64 m/s2 
D)  9.27 m/s2 
E)  ​7.73 m/s2 
A)  3.09 m/s2 
B)  6.18 m/s2 
C)  4.64 m/s2 
D)  9.27 m/s2 
E)  ​7.73 m/s2

Question 18

A truck moves 80 m east,then moves 130 m west,and finally moves east again a distance of 70 m.If east is chosen as the positive direction,what is the truck's resultant displacement?

Accepted Answer

A)  20 m 
B)  -20 m 
C)  280 m 
D)  -280 m 
E)  ​140 m 
A)  20 m 
B)  -20 m 
C)  280 m 
D)  -280 m 
E)  ​140 m

Question 19

An object moves 20 m east in 20 s and then returns to its starting point taking an additional 50 s.If west is chosen as the positive direction,what is the sign associated with the average velocity of the object?

Accepted Answer

A)  + 
B)  − 
C)  0 (no sign) 
D)  any of the above 
A)  + 
B)  − 
C)  0 (no sign) 
D)  any of the above

Question 20

A strobe photograph shows equally spaced images of a car moving along a straight road.If the time intervals between images is constant,which of the following cannot be positive?

Accepted Answer

A)  the speed of the car 
B)  the average velocity of the car 
C)  the acceleration of the car 
D)  the direction of motion of the car 
A)  the speed of the car 
B)  the average velocity of the car 
C)  the acceleration of the car 
D)  the direction of motion of the car

Exam 2: Motion in One Dimension

Jeff throws a ball straight up.For which situation is the vertical velocity zero?

A strobe photograph of a car moving along a straight road shows the interval between each successive image to be diminishing.If the direction of motion of the car is taken as positive,which of the following are negative?

A European sports car dealer claims that his product will accelerate at a constant rate from rest to a speed of 100 km/hr in 8.00 s.What is the speed after the first 5.00 s of acceleration? (Hint: First convert the speed to m/s. ) ​

A baseball catcher throws a ball vertically upward and catches it in the same spot when it returns to his mitt.At what point in the ball's path does it experience zero velocity and non-zero acceleration at the same time?

An object moves 20 m east in 20 s and then returns to its starting point taking an additional 60 s.If west is chosen as the positive direction,what is the average speed of the object?

Changing the positive direction in a reference frame to the opposite direction does not change the sign of which of the following quantities?

A rock is thrown straight up with an initial velocity of 24.9 m/s.What maximum height will the rock reach before starting to fall downward? (Take acceleration due to gravity as 9.80 m/s2. ) ​

A ball is thrown vertically upwards at 19.6 m/s.For its complete trip (up and back down to the starting position),its average speed is: ​

The value of an object's acceleration may be characterized in equivalent words by which of the following?

Mt.Everest is more than 8 000 m high.How fast would an object be moving if it could free fall to sea level after being released from an 8000-m elevation? (Ignore air resistance. )

If the displacement of an object is given in SI units by Δx = −3 t + 4 t 2,at t = 2 s its velocity and acceleration are,respectively:

In one-dimensional motion,the average speed of an object that moves from one place to another and then back to its original place has which of the following properties?

In the case of constant acceleration,the average velocity equals the instantaneous velocity:

A ball is pushed with an initial velocity of 4.0 m/s.The ball rolls down a hill with a constant acceleration of 1.4 m/s2.The ball reaches the bottom of the hill in 4.0 s.What is the ball's velocity at the bottom of the hill?

A rock is thrown straight down with an initial velocity of 14.5 m/s from a cliff.What is the rock's displacement after 2.0 s? (Acceleration due to gravity is 9.80 m/s2. )

A vehicle designed to operate on a drag strip accelerates from zero to 28 m/s while undergoing a straight line path displacement of 48 m.What is the vehicle's acceleration if its value may be assumed to be constant? ​

A European sports car dealer claims that his car will accelerate at a constant rate from rest to 100 km/hr in 9 s.If so,what is the acceleration? (Hint: First convert speed to m/s. ) ​

A truck moves 80 m east,then moves 130 m west,and finally moves east again a distance of 70 m.If east is chosen as the positive direction,what is the truck's resultant displacement?

An object moves 20 m east in 20 s and then returns to its starting point taking an additional 50 s.If west is chosen as the positive direction,what is the sign associated with the average velocity of the object?

A strobe photograph shows equally spaced images of a car moving along a straight road.If the time intervals between images is constant,which of the following cannot be positive?

Introduction

Introduction: Part A

Motion in One Dimension: Part A

Vectors and Two-Dimensional Motion

Vectors and Two-Dimensional Motion: Part A

The Laws of Motion

The Laws of Motion: Part A

Energy

Energy: Part A

Momentum and Collisions

Momentum and Collisions: Part A

Rotational Motion and the Law of Gravity

Rotational Motion and the Law of Gravity: Part A

Rotational Equilibrium and Rotational Dynamics

Rotational Equilibrium and Rotational Dynamics: Part A

Solids and Fluids

Solids and Fluids: Part A

Thermal Physics

Thermal Physics: Part A

Energy in Thermal Processes Heat and Internal Energy

Energy in Thermal Processes Heat and Internal Energy: Part A

The Laws of Thermodynamics Work in Thermodynamic Processes

The Laws of Thermodynamics Work in Thermodynamic Processes: Part A

Vibrations and Waves

Vibrations and Waves: Part A

Sound

Sound: Part A

Electric Forces and Electric Fields

Electric Forces and Electric Fields: Part A

Electrical Energy and Capacitance

Electrical Energy and Capacitance: Part A

Current and Resistance Electric Current

Current and Resistance Electric Current: Part A

Direct-Current Circuits Sources of EMF

Direct-Current Circuits Sources of EMF: Part A

Magnetism Magnets

Magnetism Magnets: Part A

Induced Voltages and Inductance

Induced Voltages and Inductance: Part A

Alternating-Current Circuits and Electromagnetic Waves

Alternating-Current Circuits and Electromagnetic Waves: Part A

Reflection and Refraction of Light

Reflection and Refraction of Light: Part A

Mirrors and Lenses

Mirrors and Lenses: Part A

Wave Optics

Wave Optics: Part A

Optical Instruments

Optical Instruments: Part A

Relativity

Relativity: Part A

Quantum Physics Blackbody Radiation and Plancks Hypothesis

Quantum Physics Blackbody Radiation and Plancks Hypothesis: Part A

Atomic Physics

Atomic Physics: Part A

Nuclear Physics

Nuclear Physics: Part A

Nuclear Energy and Elementary Particles

Nuclear Energy and Elementary Particles: Part A

A European sports car dealer claims that his product will accelerate at a constant rate from rest to a speed of 100 km/hr in 8.00 s.What is the speed after the first 5.00 s of acceleration? (Hint: First convert the speed to m/s. )

A rock is thrown straight up with an initial velocity of 24.9 m/s.What maximum height will the rock reach before starting to fall downward? (Take acceleration due to gravity as 9.80 m/s². )

A ball is thrown vertically upwards at 19.6 m/s.For its complete trip (up and back down to the starting position),its average speed is:

If the displacement of an object is given in SI units by Δx = −3 t + 4 t ²,at t = 2 s its velocity and acceleration are,respectively:

A ball is pushed with an initial velocity of 4.0 m/s.The ball rolls down a hill with a constant acceleration of 1.4 m/s².The ball reaches the bottom of the hill in 4.0 s.What is the ball's velocity at the bottom of the hill?

A rock is thrown straight down with an initial velocity of 14.5 m/s from a cliff.What is the rock's displacement after 2.0 s? (Acceleration due to gravity is 9.80 m/s². )

A vehicle designed to operate on a drag strip accelerates from zero to 28 m/s while undergoing a straight line path displacement of 48 m.What is the vehicle's acceleration if its value may be assumed to be constant?

A European sports car dealer claims that his car will accelerate at a constant rate from rest to 100 km/hr in 9 s.If so,what is the acceleration? (Hint: First convert speed to m/s. )