Question 1

Displacement is which of the following types of quantities?

Accepted Answer

A)  vector 
B)  scalar 
C)  magnitude 
D)  dimensional 
A)  vector 
B)  scalar 
C)  magnitude 
D)  dimensional

Question 2

Starting from rest,a car accelerates down a straight road with constant acceleration a1 for a time t1,then the acceleration is changed to a different constant value a2 for an additional time t2.The total elapsed time is t1 + t2.Can the equations of kinematics be used to find the total distance traveled?

Accepted Answer

A)  No,because this is not a case of constant acceleration. 
B)  Yes,use (a1 + a2)/2 as the average acceleration and the total time in the calculation. 
C)  Yes,use a1 + a2 as the acceleration and the average time (t1 + t2)/2 in the calculation. 
D)  Yes,break the problem up into 2 problems,one with the conditions for the first time interval and the other with the conditions for the second time interval,noting that for the second time interval the initial velocity is that from the end of the first time interval.When done,add the distances from each of the time intervals. 
A)  No,because this is not a case of constant acceleration. 
B)  Yes,use (a1 + a2)/2 as the average acceleration and the total time in the calculation. 
C)  Yes,use a1 + a2 as the acceleration and the average time (t1 + t2)/2 in the calculation. 
D)  Yes,break the problem up into 2 problems,one with the conditions for the first time interval and the other with the conditions for the second time interval,noting that for the second time interval the initial velocity is that from the end of the first time interval.When done,add the distances from each of the time intervals.

Question 3

An x vs.t graph is drawn for a ball moving in one direction.The graph starts at the origin and at t = 5 s the velocity of the ball is zero.We can be positive that at t = 5 s,

Accepted Answer

A)  the slope of the curve is non-zero. 
B)  the ball has stopped. 
C)  the acceleration is constant. 
D)  the curve is at x = 0,t = 0. 
A)  the slope of the curve is non-zero. 
B)  the ball has stopped. 
C)  the acceleration is constant. 
D)  the curve is at x = 0,t = 0.

Question 4

The distance of the Earth from the sun is 93 000 000 miles.If there are 3.15 × 107 s in one year,find the speed of the Earth in its orbit about the sun.

Accepted Answer

A)  9.28 miles/s 
B)  18.6 miles/s 
C)  27.9 miles/s 
D)  37.2 miles/s 
A)  9.28 miles/s 
B)  18.6 miles/s 
C)  27.9 miles/s 
D)  37.2 miles/s

Question 5

A railroad train travels forward along a straight track at 90 m/s for 1,000 m and then travels at 60 m/s for the next 1,000 m.What is the average velocity?

Accepted Answer

A)  72.5 m/s 
B)  72.0 m/s 
C)  77.0 m/s 
D)  69.0 m/s 
E)  ​74.7 m/s 
A)  72.5 m/s 
B)  72.0 m/s 
C)  77.0 m/s 
D)  69.0 m/s 
E)  ​74.7 m/s

Question 6

A ball of relatively low density is thrown upwards.Because of air resistance the acceleration while traveling upwards is −10.8 m/s2.On its trip downward the resistance is in the opposite direction,and the resulting acceleration is −8.8 m/s2.When the ball reaches the level from which it was thrown,how does its speed compare to that with which it was thrown?

Accepted Answer

A)  It is greater than the original speed upward. 
B)  It is the same as the original speed upward. 
C)  It is less than the original speed upward. 
D)  Without knowing the original speed,this problem cannot be solved. 
A)  It is greater than the original speed upward. 
B)  It is the same as the original speed upward. 
C)  It is less than the original speed upward. 
D)  Without knowing the original speed,this problem cannot be solved.

Question 7

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 6 s.What distance will the sports car travel during the 6 s acceleration period? (Hint: First convert speed to m/s. )

Accepted Answer

A)  41.5 m 
B)  58.1 m 
C)  83 m 
D)  166 m 
E)  ​124.5 m 
A)  41.5 m 
B)  58.1 m 
C)  83 m 
D)  166 m 
E)  ​124.5 m

Question 8

A 50-g ball traveling at 24.0 m/s is bounced off a brick wall and rebounds at 19.0 m/s.A high-speed camera records this event.If the ball is in contact with the wall for 4.00 ms,what is the average acceleration of the ball during this time interval?

Accepted Answer

A)  10,750 m/s2 
B)  21,500 m/s2 
C)  5,375 m/s2 
D)  10.75 m/s2 
E)  ​43 m/s2 
A)  10,750 m/s2 
B)  21,500 m/s2 
C)  5,375 m/s2 
D)  10.75 m/s2 
E)  ​43 m/s2

Question 9

A water rocket,launched from the ground,rises vertically with acceleration of 25 m/s2 for 1.0 s when it runs out of "fuel." Disregarding air resistance,how high will the rocket rise?

Accepted Answer

A)  76 m 
B)  88 m 
C)  44 m 
D)  32 m 
E)  ​13 m 
A)  76 m 
B)  88 m 
C)  44 m 
D)  32 m 
E)  ​13 m

Question 10

Which of the following is not a vector quantity?

Accepted Answer

A)  temperature 
B)  velocity 
C)  acceleration 
D)  displacement 
A)  temperature 
B)  velocity 
C)  acceleration 
D)  displacement

Question 11

Human reaction time is usually about 0.24 s.If your lab partner holds a ruler between your finger and thumb and releases it without warning,how far can you expect the ruler to fall before you catch it? The nearest value is:
​

Accepted Answer

A)  56 cm. 
B)  118 cm. 
C)  2.8 cm. 
D)  235 cm. 
E)  ​28 cm. 
A)  56 cm. 
B)  118 cm. 
C)  2.8 cm. 
D)  235 cm. 
E)  ​28 cm.

Question 12

A drag racer starts from rest and accelerates at 11 m/s2 for the entire distance of 400 m.What is the velocity of the race car at the end of the run?

Accepted Answer

A)  113 m/s 
B)  94 m/s 
C)  71 m/s 
D)  47 m/s 
E)  ​80 m/s 
A)  113 m/s 
B)  94 m/s 
C)  71 m/s 
D)  47 m/s 
E)  ​80 m/s

Question 13

Omar throws a rock down with speed 10 m/s from the top of a tower.The rock hits the ground after 1 s.What is the height of the tower? (air resistance is negligible)
​

Accepted Answer

A)  12 m 
B)  8 m 
C)  15 m 
D)  27 m 
E)  ​23 m 
A)  12 m 
B)  8 m 
C)  15 m 
D)  27 m 
E)  ​23 m

Question 14

The slope of the acceleration vs.time curve represents:

Accepted Answer

A)  the velocity. 
B)  the rate of change of acceleration. 
C)  the rate of change of displacement. 
D)  the area under the position vs.time curve. 
A)  the velocity. 
B)  the rate of change of acceleration. 
C)  the rate of change of displacement. 
D)  the area under the position vs.time curve.

Question 15

A rock is thrown straight up with an initial velocity of 22.54 m/s.What time interval elapses between the rock's being thrown and its return to the original launch point? (Acceleration due to gravity is 9.80 m/s2. )
​

Accepted Answer

A)  4.60 s 
B)  2.30 s 
C)  3.45 s 
D)  3.91 s 
E)  ​5.06 s 
A)  4.60 s 
B)  2.30 s 
C)  3.45 s 
D)  3.91 s 
E)  ​5.06 s

Question 16

A cart is given an initial velocity of 7.0 m/s and experiences a constant acceleration of 2.5 m/s2.What is the magnitude of the cart's displacement during the first 6.0 s of its motion?
​

Accepted Answer

A)  52 m 
B)  132 m 
C)  87 m 
D)  15 m 
E)  ​22 m 
A)  52 m 
B)  132 m 
C)  87 m 
D)  15 m 
E)  ​22 m

Question 17

Consider the magnitude of the average speed,  
,and the magnitude of the average velocity,  
,for the same trip.Which of the following is always true?

Accepted Answer

A) 
  
B) 
  
C) 
  
D)  none of the above 
A) 
  
B) 
  
C) 
  
D)  none of the above

Question 18

On a position versus time graph,the slope of the straight line joining two points on the plotted curve that are separated in time by the interval Δt,is which of the following quantities?

Accepted Answer

A)  average steepness 
B)  average velocity 
C)  instantaneous velocity 
D)  average acceleration 
A)  average steepness 
B)  average velocity 
C)  instantaneous velocity 
D)  average acceleration

Question 19

Two objects of different mass are released simultaneously from the top of a 20-m tower and fall to the ground.If air resistance is negligible,which statement best applies?

Accepted Answer

A)  The greater mass hits the ground first. 
B)  Both objects hit the ground together. 
C)  The smaller mass hits the ground first. 
D)  No conclusion can be made with the information given. 
A)  The greater mass hits the ground first. 
B)  Both objects hit the ground together. 
C)  The smaller mass hits the ground first. 
D)  No conclusion can be made with the information given.

Question 20

A bird,accelerating from rest at a constant rate,experiences a displacement of 25 m in 11 s.What is its acceleration?

Accepted Answer

A)  0.21 m/s2 
B)  0.41 m/s2 
C)  0.51 m/s2 
D)  0.31 m/s2 
E)  0.62 m/s2 
A)  0.21 m/s2 
B)  0.41 m/s2 
C)  0.51 m/s2 
D)  0.31 m/s2 
E)  0.62 m/s2

Exam 2: Motion in One Dimension

Displacement is which of the following types of quantities?

An x vs.t graph is drawn for a ball moving in one direction.The graph starts at the origin and at t = 5 s the velocity of the ball is zero.We can be positive that at t = 5 s,

The distance of the Earth from the sun is 93 000 000 miles.If there are 3.15 × 107 s in one year,find the speed of the Earth in its orbit about the sun.

A railroad train travels forward along a straight track at 90 m/s for 1,000 m and then travels at 60 m/s for the next 1,000 m.What is the average velocity?

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 6 s.What distance will the sports car travel during the 6 s acceleration period? (Hint: First convert speed to m/s. )

A 50-g ball traveling at 24.0 m/s is bounced off a brick wall and rebounds at 19.0 m/s.A high-speed camera records this event.If the ball is in contact with the wall for 4.00 ms,what is the average acceleration of the ball during this time interval?

A water rocket,launched from the ground,rises vertically with acceleration of 25 m/s2 for 1.0 s when it runs out of "fuel." Disregarding air resistance,how high will the rocket rise?

Which of the following is not a vector quantity?

Human reaction time is usually about 0.24 s.If your lab partner holds a ruler between your finger and thumb and releases it without warning,how far can you expect the ruler to fall before you catch it? The nearest value is: ​

A drag racer starts from rest and accelerates at 11 m/s2 for the entire distance of 400 m.What is the velocity of the race car at the end of the run?

Omar throws a rock down with speed 10 m/s from the top of a tower.The rock hits the ground after 1 s.What is the height of the tower? (air resistance is negligible) ​

The slope of the acceleration vs.time curve represents:

A rock is thrown straight up with an initial velocity of 22.54 m/s.What time interval elapses between the rock's being thrown and its return to the original launch point? (Acceleration due to gravity is 9.80 m/s2. ) ​

A cart is given an initial velocity of 7.0 m/s and experiences a constant acceleration of 2.5 m/s2.What is the magnitude of the cart's displacement during the first 6.0 s of its motion? ​

Consider the magnitude of the average speed, ,and the magnitude of the average velocity, ,for the same trip.Which of the following is always true?

On a position versus time graph,the slope of the straight line joining two points on the plotted curve that are separated in time by the interval Δt,is which of the following quantities?

Two objects of different mass are released simultaneously from the top of a 20-m tower and fall to the ground.If air resistance is negligible,which statement best applies?

A bird,accelerating from rest at a constant rate,experiences a displacement of 25 m in 11 s.What is its acceleration?

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

Particle Collisions, Mediating Photons, and Quark Structures: Exploring the Fundamentals of Physics

Filters

The distance of the Earth from the sun is 93 000 000 miles.If there are 3.15 × 10⁷ s in one year,find the speed of the Earth in its orbit about the sun.

A water rocket,launched from the ground,rises vertically with acceleration of 25 m/s² for 1.0 s when it runs out of "fuel." Disregarding air resistance,how high will the rocket rise?

Human reaction time is usually about 0.24 s.If your lab partner holds a ruler between your finger and thumb and releases it without warning,how far can you expect the ruler to fall before you catch it? The nearest value is:

A drag racer starts from rest and accelerates at 11 m/s² for the entire distance of 400 m.What is the velocity of the race car at the end of the run?

Omar throws a rock down with speed 10 m/s from the top of a tower.The rock hits the ground after 1 s.What is the height of the tower? (air resistance is negligible)

A rock is thrown straight up with an initial velocity of 22.54 m/s.What time interval elapses between the rock's being thrown and its return to the original launch point? (Acceleration due to gravity is 9.80 m/s². )

A cart is given an initial velocity of 7.0 m/s and experiences a constant acceleration of 2.5 m/s².What is the magnitude of the cart's displacement during the first 6.0 s of its motion?