Question 1

A car travels north at 30 m/s for one half hour.It then travels south at 40 m/s for 15 minutes.The total distance the car has traveled and its displacement are:

Accepted Answer

A)  18 km;18 km S.
B)  36 km;36 km S.
C)  36 km;36 km N.
D)  90 km;18 km N.
E)  90 km;36 km N. D

Question 2

The position of a particle moving along the y axis has a position given by 
Is there any time interval during which the particle is not moving?

Accepted Answer

A)  Yes,from 0.60 s to 1.00 s.
B)  Yes,from 0.795 s to 0.805 s.
C)  Yes,at the time t = 0.80 s.
D)  No,the velocity is never zero.
E)  No,an instant is not the same as a time interval. E

Question 3

An object is thrown vertically upward such that it has a speed of 25 m/s when it reaches two thirds of its maximum height above the launch point.Determine this maximum height.

Accepted Answer

A)  64 m
B)  48 m
C)  32 m
D)  96 m
E)  75 m D

Question 4

A ball thrown vertically from ground level is caught 3.0 s later when it is at its highest point by a person on a balcony which is 14 m above the ground.Determine the initial speed of the ball.

Accepted Answer

A)  19 m/s
B)  4.7 m/s
C)  10 m/s
D)  34 m/s
E)  17 m/s

Question 5

Five motion diagrams in which points represent the positions of an object at equal time intervals are shown below.Which statement is correct?

Accepted Answer

A)  A has the greatest speed and the greatest acceleration.
B)  C has decreasing speed.
C)  D slows down and then speeds up.
D)  D speeds up and then slows down.
E)  E has a greater speed than A.

Question 6

The velocity of a particle moving along the x axis is given for t > 0 by vx = (32.0t − 2.00t3)m/s,where t is in s.What is the acceleration of the particle when (after t = 0)it achieves its maximum displacement in the positive x direction?

Accepted Answer

A)  −64.0 m/s2
B)  zero
C)  128 m/s2
D)  32.0 m/s2
E)  −32.0 m/s2

Question 7

A rocket,initially at rest,is fired vertically with an upward acceleration of 10 m/s2.At an altitude of 0.50 km,the engine of the rocket cuts off.What is the maximum altitude it achieves?

Accepted Answer

A)  1.9 km
B)  1.3 km
C)  1.6 km
D)  1.0 km
E)  2.1 km

Question 8

A juggler throws two balls to the same height so that one is at the halfway point going up when the other is at the halfway point coming down.At that point:

Accepted Answer

A)  Their velocities and accelerations are equal.
B)  Their velocities are equal but their accelerations are equal and opposite.
C)  Their accelerations are equal but their velocities are equal and opposite.
D)  Their velocities and accelerations are both equal and opposite.
E)  Their velocities are equal to their accelerations.

Question 9

In 2.0 s,a particle moving with constant acceleration along the x axis goes from x = 10 m to x = 50 m.The velocity at the end of this time interval is 10 m/s.What is the acceleration of the particle?

Accepted Answer

A)  +15 m/s2
B)  +20 m/s2
C)  −20 m/s2
D)  −10 m/s2
E)  −15 m/s2

Question 10

A peregrine falcon dives at a pigeon.The falcon starts with zero downward velocity and falls with the acceleration of gravity.If the pigeon is 76.0 m below the initial height of the falcon,how long does it take the falcon to intercept the pigeon?

Accepted Answer

The answer of A peregrine falcon dives at a pigeon.The...

Question 11

A bicyclist starts down a hill with an initial speed of 2.0 m/s.She moves down the hill with a constant acceleration,arriving at the bottom of the hill with a speed of 8.0 m/s.If the hill is 12 m long,how long did it take the bicyclist to travel down the hill?

Accepted Answer

The answer of A bicyclist starts down a hill with...

Question 12

Two identical balls are at rest and side by side at the top of a hill.You let one ball,A,start rolling down the hill.A little later you start the second ball,B,down the hill by giving it a shove.The second ball rolls down the hill along a line parallel to the path of the first ball and passes it.At the instant ball B passes ball A:

Accepted Answer

A)  it has the same position and the same velocity as A.
B)  it has the same position and the same acceleration as A.
C)  it has the same velocity and the same acceleration as A.
D)  it has the same displacement and the same velocity as A.
E)  it has the same position,displacement and velocity as A.

Question 13

The area under a graph of ax vs.t from t = ti to t = tf represents

Accepted Answer

A)  xf − xi.
B)  vf − vi.
C)  xavg.
D)  vavg.
E)  aavg.

Question 14

The velocity at the midway point of a ball able to reach a height y when thrown with velocity vi at the origin is:

Accepted Answer

A)   i at the origin is: 
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B)     
C)     
D)     
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B)   i at the origin is: 
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C)     
D)     
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C)   i at the origin is: 
A)     
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D)     
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D)   i at the origin is: 
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Question 15

A 50-gram superball traveling at 25.0 m/s is bounced off a brick wall and rebounds at 22.0 m/s.A high-speed camera records this event.If the ball is in contact with the wall for 3.50 ms,what is the average acceleration of the ball during this time interval?

Accepted Answer

The answer of A 50-gram superball traveling at 25.0 m/s...

Question 16

An object moving on the x axis with a constant acceleration increases its x coordinate by 80 m in a time of 5.0 s and has a velocity of +20 m/s at the end of this time.Determine the acceleration of the object during this motion.

Accepted Answer

A)  −1.6 m/s2
B)  +6.4 m/s2
C)  +1.6 m/s2
D)  −2.0 m/s2
E)  −6.4 m/s2

Question 17

A particle starts from rest at xi = 0 and moves for 10 s with an acceleration of +2.0 cm/s2.For the next 20 s,the acceleration of the particle is −1.0 cm/s2.What is the position of the particle at the end of this motion?

Accepted Answer

A)  zero
B)  +3.0 m
C)  −1.0 m
D)  +2.0 m
E)  −3.0 m

Question 18

The position of an object at equal time intervals is shown below: 
Which graph below correctly represents position versus time for this object?

Accepted Answer

A)   
B)   
C)   
D)   
E)

Question 19

Two identical balls are at rest side by side at the bottom of a hill.Some time after ball A is kicked up the hill,ball B is given a kick up the hill.Ball A is headed downhill when it passes ball B headed up the hill.At the instant when ball A passes ball B,

Accepted Answer

A)  it has the same position and velocity as ball B.
B)  it has the same position and acceleration as ball B.
C)  it has the same velocity and acceleration as ball B.
D)  it has the same displacement and velocity as ball B.
E)  it has the same position,displacement and velocity as ball B.

Question 20

The equation that solves a problem is 
)The problem is:

Accepted Answer

A)  What is the initial velocity of a car that goes from rest to 18 m/s in 3.0 s?
B)  What is the final velocity of a car that goes from rest to 18 m/s in 3.0 s?
C)  What is the initial velocity of a car that accelerates at 18 m/s for 3.0 s?
D)  What is the final velocity of a car that accelerates at 3.0 m/s2 over a 6.0 m distance?
E)  What is the final velocity of a car that accelerates at 3.0 m/s2 over a 3.0 m distance?

Exam 2: Motion in One Dimension

A car travels north at 30 m/s for one half hour.It then travels south at 40 m/s for 15 minutes.The total distance the car has traveled and its displacement are:

The position of a particle moving along the y axis has a position given by Is there any time interval during which the particle is not moving?

An object is thrown vertically upward such that it has a speed of 25 m/s when it reaches two thirds of its maximum height above the launch point.Determine this maximum height.

A ball thrown vertically from ground level is caught 3.0 s later when it is at its highest point by a person on a balcony which is 14 m above the ground.Determine the initial speed of the ball.

Five motion diagrams in which points represent the positions of an object at equal time intervals are shown below.Which statement is correct?

The velocity of a particle moving along the x axis is given for t > 0 by v_x = (32.0t − 2.00t³) m/s,where t is in s.What is the acceleration of the particle when (after t = 0) it achieves its maximum displacement in the positive x direction?

A rocket,initially at rest,is fired vertically with an upward acceleration of 10 m/s².At an altitude of 0.50 km,the engine of the rocket cuts off.What is the maximum altitude it achieves?

A juggler throws two balls to the same height so that one is at the halfway point going up when the other is at the halfway point coming down.At that point:

In 2.0 s,a particle moving with constant acceleration along the x axis goes from x = 10 m to x = 50 m.The velocity at the end of this time interval is 10 m/s.What is the acceleration of the particle?

A peregrine falcon dives at a pigeon.The falcon starts with zero downward velocity and falls with the acceleration of gravity.If the pigeon is 76.0 m below the initial height of the falcon,how long does it take the falcon to intercept the pigeon?

A bicyclist starts down a hill with an initial speed of 2.0 m/s.She moves down the hill with a constant acceleration,arriving at the bottom of the hill with a speed of 8.0 m/s.If the hill is 12 m long,how long did it take the bicyclist to travel down the hill?

The area under a graph of a_x vs.t from t = t_i to t = t_f represents

The velocity at the midway point of a ball able to reach a height y when thrown with velocity v_i at the origin is:

A 50-gram superball traveling at 25.0 m/s is bounced off a brick wall and rebounds at 22.0 m/s.A high-speed camera records this event.If the ball is in contact with the wall for 3.50 ms,what is the average acceleration of the ball during this time interval?

An object moving on the x axis with a constant acceleration increases its x coordinate by 80 m in a time of 5.0 s and has a velocity of +20 m/s at the end of this time.Determine the acceleration of the object during this motion.

A particle starts from rest at x_i = 0 and moves for 10 s with an acceleration of +2.0 cm/s².For the next 20 s,the acceleration of the particle is −1.0 cm/s².What is the position of the particle at the end of this motion?

The position of an object at equal time intervals is shown below: Which graph below correctly represents position versus time for this object?

Two identical balls are at rest side by side at the bottom of a hill.Some time after ball A is kicked up the hill,ball B is given a kick up the hill.Ball A is headed downhill when it passes ball B headed up the hill.At the instant when ball A passes ball B,

The equation that solves a problem is ) The problem is:

Exam 2: Motion in One Dimension

A car travels north at 30 m/s for one half hour.It then travels south at 40 m/s for 15 minutes.The total distance the car has traveled and its displacement are:

The position of a particle moving along the y axis has a position given by Is there any time interval during which the particle is not moving?

An object is thrown vertically upward such that it has a speed of 25 m/s when it reaches two thirds of its maximum height above the launch point.Determine this maximum height.

A ball thrown vertically from ground level is caught 3.0 s later when it is at its highest point by a person on a balcony which is 14 m above the ground.Determine the initial speed of the ball.

Five motion diagrams in which points represent the positions of an object at equal time intervals are shown below.Which statement is correct?

The velocity of a particle moving along the x axis is given for t > 0 by vx = (32.0t − 2.00t3) m/s,where t is in s.What is the acceleration of the particle when (after t = 0) it achieves its maximum displacement in the positive x direction?

A rocket,initially at rest,is fired vertically with an upward acceleration of 10 m/s2.At an altitude of 0.50 km,the engine of the rocket cuts off.What is the maximum altitude it achieves?

A juggler throws two balls to the same height so that one is at the halfway point going up when the other is at the halfway point coming down.At that point:

In 2.0 s,a particle moving with constant acceleration along the x axis goes from x = 10 m to x = 50 m.The velocity at the end of this time interval is 10 m/s.What is the acceleration of the particle?

A peregrine falcon dives at a pigeon.The falcon starts with zero downward velocity and falls with the acceleration of gravity.If the pigeon is 76.0 m below the initial height of the falcon,how long does it take the falcon to intercept the pigeon?

A bicyclist starts down a hill with an initial speed of 2.0 m/s.She moves down the hill with a constant acceleration,arriving at the bottom of the hill with a speed of 8.0 m/s.If the hill is 12 m long,how long did it take the bicyclist to travel down the hill?

The area under a graph of ax vs.t from t = ti to t = tf represents

The velocity at the midway point of a ball able to reach a height y when thrown with velocity vi at the origin is:

A 50-gram superball traveling at 25.0 m/s is bounced off a brick wall and rebounds at 22.0 m/s.A high-speed camera records this event.If the ball is in contact with the wall for 3.50 ms,what is the average acceleration of the ball during this time interval?

An object moving on the x axis with a constant acceleration increases its x coordinate by 80 m in a time of 5.0 s and has a velocity of +20 m/s at the end of this time.Determine the acceleration of the object during this motion.

A particle starts from rest at xi = 0 and moves for 10 s with an acceleration of +2.0 cm/s2.For the next 20 s,the acceleration of the particle is −1.0 cm/s2.What is the position of the particle at the end of this motion?

The position of an object at equal time intervals is shown below: Which graph below correctly represents position versus time for this object?

Two identical balls are at rest side by side at the bottom of a hill.Some time after ball A is kicked up the hill,ball B is given a kick up the hill.Ball A is headed downhill when it passes ball B headed up the hill.At the instant when ball A passes ball B,

The equation that solves a problem is ) The problem is:

The velocity of a particle moving along the x axis is given for t > 0 by v_x = (32.0t − 2.00t³) m/s,where t is in s.What is the acceleration of the particle when (after t = 0) it achieves its maximum displacement in the positive x direction?

A rocket,initially at rest,is fired vertically with an upward acceleration of 10 m/s².At an altitude of 0.50 km,the engine of the rocket cuts off.What is the maximum altitude it achieves?

The area under a graph of a_x vs.t from t = t_i to t = t_f represents

The velocity at the midway point of a ball able to reach a height y when thrown with velocity v_i at the origin is:

A particle starts from rest at x_i = 0 and moves for 10 s with an acceleration of +2.0 cm/s².For the next 20 s,the acceleration of the particle is −1.0 cm/s².What is the position of the particle at the end of this motion?