Question 1

Which of the following graphs represent an object having zero acceleration? 
A.

B.

C.

D.

Accepted Answer

A) only graph a 
B) only graph b 
C) graphs a and b 
D) graphs b and c 
E) graphs c and d 
A) only graph a 
B) only graph b 
C) graphs a and b 
D) graphs b and c 
E) graphs c and d C

Question 2

A car is traveling north at $17.7 \mathrm {~m} / \mathrm { s }$ After 12 s its velocity is $14.1 \mathrm {~m} / \mathrm { s }$ in the same direction. Find the magnitude and direction of the car's average acceleration.

Accepted Answer

A) 0.30 m/s2, south 
B) 2.7 m/s2, south 
C) 0.30 m/s2, north 
D) 2.7 m/s2, north 
A) 0.30 m/s2, south 
B) 2.7 m/s2, south 
C) 0.30 m/s2, north 
D) 2.7 m/s2, north A

Question 3

The figure shows a graph of the position x of two cars, C and D, as a function of time t.   According to this graph, which statements about these cars must be true? (There could be more than one correct choice.)

Accepted Answer

A) The magnitude of the acceleration of car C is greater than the magnitude of the acceleration of car D. 
B) The magnitude of the acceleration of car C is less than the magnitude of the acceleration of car D. 
C) At time t = 10 s, both cars have the same velocity. 
D) Both cars have the same acceleration. 
E) The cars meet at time t = 10 s. 
A) The magnitude of the acceleration of car C is greater than the magnitude of the acceleration of car D. 
B) The magnitude of the acceleration of car C is less than the magnitude of the acceleration of car D. 
C) At time t = 10 s, both cars have the same velocity. 
D) Both cars have the same acceleration. 
E) The cars meet at time t = 10 s. D, E

Question 4

Two cars are traveling at the same speed and hit the brakes at the same time. Car A decelerates (decreases its velocity)at twice the rate of car B. If car B takes time T to stop, how long does it take car A to stop?

Accepted Answer

A) 4T 
B) 2T 
C) T 
D) T /2 
E) T/4 
A) 4T 
B) 2T 
C) T 
D) T /2 
E) T/4

Question 5

A car starts from rest and accelerates uniformly at 3.0 m/s2 toward the north. A second car starts from rest 6.0 s later at the same point and accelerates uniformly at 5.0 m/s2 toward the north. How long after the second car starts does it overtake the first car?

Accepted Answer

A) 12 s 
B) 19 s 
C) 21 s 
D) 24 s 
A) 12 s 
B) 19 s 
C) 21 s 
D) 24 s

Question 6

To determine the height of a bridge above the water, a person drops a stone and measures the time it takes for it to hit the water. If the time is 2.3 s, what is the height of the bridge? Neglect air resistance.

Accepted Answer

A) 10 m 
B) 14 m 
C) 26 m 
D) 32 m 
E) 52 m 
A) 10 m 
B) 14 m 
C) 26 m 
D) 32 m 
E) 52 m

Question 7

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 half this speed, that is 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 8

To determine the height of a bridge above the water, a person drops a stone and measures the time it takes for it to hit the water. If the height of the bridge is 41 m, how long will it take for the stone to hit the water? Neglect air resistance.

Accepted Answer

A) 2.3 s 
B) 2.6 s 
C) 2.9 s 
D) 3.2 s 
E) 3.6 s 
A) 2.3 s 
B) 2.6 s 
C) 2.9 s 
D) 3.2 s 
E) 3.6 s

Question 9

An instrument is thrown upward with a speed of 15 m/s on the surface of planet X where the acceleration due to gravity is 2.5 m/s2 and there is no atmosphere. How long does it take for the instrument to return to where it was thrown?

Accepted Answer

A) 6.0 s 
B) 8.0 s 
C) 10 s 
D) 12 s 
A) 6.0 s 
B) 8.0 s 
C) 10 s 
D) 12 s

Question 10

At the same moment, one rock is dropped and one is thrown downward with an initial velocity of $29 \mathrm {~m} / \mathrm { s }$ from the top of a building that is $300 \mathrm {~m}$ tall. How much earlier does the thrown rock strike the ground? Neglect air resistance.

Accepted Answer

The answer of At the same moment, one rock is...

Question 11

A car moving initially with speed v0 slows down with an acceleration of magnitude a and comes to a full stop after traveling a distance d. What was the speed of the car when it had traveled half that distance, d/2?

Accepted Answer

A) v0/2 
B) v0/4 
C) v0/ $\sqrt { 2 }$ 
D) v0/8 
A) v0/2 
B) v0/4 
C) v0/ $\sqrt { 2 }$ 
D) v0/8

Question 12

A car initially traveling at 60 km/h accelerates at a constant rate of 2.0 m/s2. How much time is required for the car to reach a speed of 90 km/h?

Accepted Answer

A) 15 s 
B) 30 s 
C) 45 s 
D) 4.2 s 
A) 15 s 
B) 30 s 
C) 45 s 
D) 4.2 s

Question 13

The position x(t)of a particle as a function of time t is given by the equation x(t)= (3.5 m/s)t - (5.0 m/s2)t2. What is the average velocity of the particle between t = 0.30 s and t = 0.40 s?

Accepted Answer

Question 14

If the velocity of an object is zero at some point, then its acceleration must also be zero at that point.

Accepted Answer

A) True 
 B)False

Question 15

The graph in the figure shows the position of a particle as a function of time as it travels along the x-axis.
(a)What is the average speed of the particle between t = 2.0 s and t = 4.0 s?
(b)What is the average velocity of the particle between t = 2.0 s and t = 4.0 s?

Accepted Answer

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

Question 16

A car that is initially moving at 7.50 m/s begins to accelerate forward uniformly at 0.550 m/s2.
(a)How long after beginning to accelerate does it take the car to move 3.50 km?
(b)How fast is the car moving just as it has traveled 3.50 km?

Accepted Answer

(a)1.00 ×

Question 17

An object moving in the +x direction experiences an acceleration of +2.0 m/s2. This means the object

Accepted Answer

A) travels 2.0 m in every second. 
B) is traveling at 2.0 m/s. 
C) is decreasing its velocity by 2.0 m/s every second. 
D) is increasing its velocity by 2.0 m/s every second. 
A) travels 2.0 m in every second. 
B) is traveling at 2.0 m/s. 
C) is decreasing its velocity by 2.0 m/s every second. 
D) is increasing its velocity by 2.0 m/s every second.

Question 18

A racquetball strikes a wall with a speed of 30 m/s and rebounds in the opposite direction with a speed of 26 m/s. The collision takes 20 ms. What is the average acceleration of the ball during the collision with the wall?

Accepted Answer

A) 0 m/s2 
B) 200 m/s2 
C) 2800 m/s2 
D) 1500 m/s2 
E) 1300 m/s2 
A) 0 m/s2 
B) 200 m/s2 
C) 2800 m/s2 
D) 1500 m/s2 
E) 1300 m/s2

Question 19

An object is moving with constant non-zero velocity in the +x direction. The velocity versus time graph of 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 20

The graph in the figure shows the position of a particle as it travels along the x-axis. What is the magnitude of the average velocity of the particle between t = 1.0 s and t = 4.0 s?

Accepted Answer

A) 0.25 m/s 
B) 0.50 m/s 
C) 0.67 m/s 
D) 1.0 m/s 
E) 1.3 m/s 
A) 0.25 m/s 
B) 0.50 m/s 
C) 0.67 m/s 
D) 1.0 m/s 
E) 1.3 m/s

Exam 2: Motion in One Dimension

Which of the following graphs represent an object having zero acceleration? A. B. C. D.

A car is traveling north at 17.7 m/s17.7 \mathrm {~m} / \mathrm { s }17.7 m/s After 12 s its velocity is 14.1 m/s14.1 \mathrm {~m} / \mathrm { s }14.1 m/s in the same direction. Find the magnitude and direction of the car's average acceleration.

The figure shows a graph of the position x of two cars, C and D, as a function of time t. According to this graph, which statements about these cars must be true? (There could be more than one correct choice.)

Two cars are traveling at the same speed and hit the brakes at the same time. Car A decelerates (decreases its velocity)at twice the rate of car B. If car B takes time T to stop, how long does it take car A to stop?

A car starts from rest and accelerates uniformly at 3.0 m/s2 toward the north. A second car starts from rest 6.0 s later at the same point and accelerates uniformly at 5.0 m/s2 toward the north. How long after the second car starts does it overtake the first car?

To determine the height of a bridge above the water, a person drops a stone and measures the time it takes for it to hit the water. If the time is 2.3 s, what is the height of the bridge? Neglect air resistance.

To determine the height of a bridge above the water, a person drops a stone and measures the time it takes for it to hit the water. If the height of the bridge is 41 m, how long will it take for the stone to hit the water? Neglect air resistance.

An instrument is thrown upward with a speed of 15 m/s on the surface of planet X where the acceleration due to gravity is 2.5 m/s2 and there is no atmosphere. How long does it take for the instrument to return to where it was thrown?

At the same moment, one rock is dropped and one is thrown downward with an initial velocity of 29 m/s29 \mathrm {~m} / \mathrm { s }29 m/s from the top of a building that is 300 m300 \mathrm {~m}300 m tall. How much earlier does the thrown rock strike the ground? Neglect air resistance.

A car moving initially with speed v0 slows down with an acceleration of magnitude a and comes to a full stop after traveling a distance d. What was the speed of the car when it had traveled half that distance, d/2?

A car initially traveling at 60 km/h accelerates at a constant rate of 2.0 m/s2. How much time is required for the car to reach a speed of 90 km/h?

The position x(t)of a particle as a function of time t is given by the equation x(t)= (3.5 m/s)t - (5.0 m/s2)t2. What is the average velocity of the particle between t = 0.30 s and t = 0.40 s?

If the velocity of an object is zero at some point, then its acceleration must also be zero at that point.

The graph in the figure shows the position of a particle as a function of time as it travels along the x-axis. (a)What is the average speed of the particle between t = 2.0 s and t = 4.0 s? (b)What is the average velocity of the particle between t = 2.0 s and t = 4.0 s?

A car that is initially moving at 7.50 m/s begins to accelerate forward uniformly at 0.550 m/s2. (a)How long after beginning to accelerate does it take the car to move 3.50 km? (b)How fast is the car moving just as it has traveled 3.50 km?

An object moving in the +x direction experiences an acceleration of +2.0 m/s2. This means the object

A racquetball strikes a wall with a speed of 30 m/s and rebounds in the opposite direction with a speed of 26 m/s. The collision takes 20 ms. What is the average acceleration of the ball during the collision with the wall?

An object is moving with constant non-zero velocity in the +x direction. The velocity versus time graph of this object is

The graph in the figure shows the position of a particle as it travels along the x-axis. What is the magnitude of the average velocity of the particle between t = 1.0 s and t = 4.0 s?

Representing Motion

Vectors and Motion in Two Dimensions

Forces and Newtons Laws of Motion

Applying Newtons Laws

Gravity

Rotational Motion

Equilibrium Ad Elasticity

Momentum

Energy and Work

Using Energy

Thermal Properties of Matter

Fluids

Oscillations

Traveling Waves and Sound

Superposition and Standing Waves

Wave Optics

Ray Optics

Optical Instruments

Electric Fields and Forces

Electric Potential

Current and Resistance

Circuits

Magnetic Fields and Forces

Em Induction and Em Waves

Ac Electricity

Relativity

Quantum Physics

Atoms and Molecules

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A car is traveling north at $17.7 \mathrm {~m} / \mathrm { s }$ After 12 s its velocity is $14.1 \mathrm {~m} / \mathrm { s }$ in the same direction. Find the magnitude and direction of the car's average acceleration.

A car starts from rest and accelerates uniformly at 3.0 m/s² toward the north. A second car starts from rest 6.0 s later at the same point and accelerates uniformly at 5.0 m/s² toward the north. How long after the second car starts does it overtake the first car?

An instrument is thrown upward with a speed of 15 m/s on the surface of planet X where the acceleration due to gravity is 2.5 m/s² and there is no atmosphere. How long does it take for the instrument to return to where it was thrown?

At the same moment, one rock is dropped and one is thrown downward with an initial velocity of $29 \mathrm {~m} / \mathrm { s }$ from the top of a building that is $300 \mathrm {~m}$ tall. How much earlier does the thrown rock strike the ground? Neglect air resistance.

A car moving initially with speed v₀ slows down with an acceleration of magnitude a and comes to a full stop after traveling a distance d. What was the speed of the car when it had traveled half that distance, d/2?

A car initially traveling at 60 km/h accelerates at a constant rate of 2.0 m/s². How much time is required for the car to reach a speed of 90 km/h?

The position x(t)of a particle as a function of time t is given by the equation x(t)= (3.5 m/s)t - (5.0 m/s²)t². What is the average velocity of the particle between t = 0.30 s and t = 0.40 s?

A car that is initially moving at 7.50 m/s begins to accelerate forward uniformly at 0.550 m/s². (a)How long after beginning to accelerate does it take the car to move 3.50 km? (b)How fast is the car moving just as it has traveled 3.50 km?

An object moving in the +x direction experiences an acceleration of +2.0 m/s². This means the object