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13 -- Part 4: Answers and Explanations to the Chapter Review Questions

- In order for the passengers of the truck to hear the music from the car with no change in the Frequency, there must be no relative motion between the car and the truck.
- If the truck has the same magnitude and direction as the car, it's true.

- The person's perception of the sound of the horn is higher than the original sound of the train because of the Doppler effect.
- The person still sees a higher Frequency as the train slows, but it is not as high as it was.
- The person hears a decrease in the sound of the horn.
- The intensity of the horn is perceived by the person.

- The current through each of the resistors doesn't change.
- The energy dissipated by each unit time is constant.

- There is a difference between the current produced in the two circuits.

- The direction of the individual electric fields produced by the two charges is the same.

- When springs are connected in a series.

- The sum of the forces acting on an object is zero.
- The object's acceleration is also 0 if the net force on the object is equal to 0.
- An object can have both net and nonzero energy.

- The frequency of the pendulum would increase if the length of the pendulum was decreased.

- Negative displacement is the axis.

- Section a tells you that the object is moving in a positive direction.

- Section b tells you that the object is traveling in a positive direction.
- Section c tells you that the object is moving in the positive direction even though it is slowing down.
- Section d tells you that the object is moving in a negative direction and speeding up.

- The speaker has a downward velocity of 20 m/s after 10 s.

- The intensity will be doubled by decreasing the distance between the detector and speaker.
- The detector's intensity is equal to 3.2 x 10-8 W/m2 when the speaker is at half its maximum height.

- The total change around a closed loop must be zero.

- The resistance of the voltmeter should be very high in order to minimize the impact on the circuit.

- A(15 O) + A(20 O) is equal to 25 V.

- There are three forces acting on the spheres in a free body diagram.
- The weight of the sphere and the normal force must be combined to provide the Torque.

- Both objects experience the same force.

- The hollow sphere has more inertia than the solid sphere because it is distributed further from the axis.
- The solid sphere can reach the bottom of the plane first with a smaller inertia.

- Both objects start with zero energy.
- The potential energy of both objects is converted into energy when they reach the bottom of the inclined plane.
- Both objects have the same energy at the bottom of the plane.

- Section I contains 50 multiple-choice questions.

- Both sections of the AP PHYSICS 1 exam can be used with calculus.

- No credit will be given for anything written in the exam booklet, but you can use it for notes or scratch work.
- There are two types of multiple-choice questions, single-select and multi-select.
- After you have decided which of the suggested answers is the best, fill in the corresponding ovals on the answer sheet.
- You have to give both answers in order to earn credit for single-select and multi-select.
- If you change an answer, make sure the previous mark is erased completely.
- Here is an answer to a question.

- Use your time effectively, working as quickly as you can.

- Don't spend a lot of time on one question.
- If you have time, you can come back to the questions you have not answered.
- Everyone will not know the answers to all the multiple-choice questions.

- Many candidates wonder if they should guess the answers to the questions.
- Multiple-choice scores are based on the number of questions answered correctly.
- Incorrect answers and unanswered questions are not deducted for points.
- You are encouraged to answer all multiple-choice questions because points are not deducted for incorrect answers.

- If you don't know the answer to a question, you should eliminate as many choices as you can, and then pick the best answer.

- Four suggested answers or completions are followed by each of the questions or incomplete statements.
- Pick the one that is best in each case and then fill in the circle on the answer sheet.

- An explorer travels 30 m east, then 20 m south of east, and then 140 m north.

- The explorer traveled 60 s, 130 s, and 70 s to travel 30 m, 20 m, and 140 m north.

- The position-versus-time graph of an object is shown above.

- A cannonball is fired with an initial velocity of 20 m/s and a launch angle of 45deg at a wall 30 m away.

If the final speed of the car is 15 m/s, what was the acceleration of the 9?

- The rocket is in the air.
- The rocket is 40 m above the ground a few moments after liftoff.
- The rocket is now 200 m off the ground.

- A student presses a book.
- A box with a mass of 10 kilograms is placed on a plane that makes a 60 degree angle with the horizontal.

- A 2000 kilo car has a head on collision with a 1000 kilo car.

- Two students push two boxes.

- A worker moves a 30 kilo box by pulling on a rope that makes a 60 degree angle with the horizontal.

- To maintain a speed of 30 m/s up an incline, a car's engine must exert a force of 2,000 N.

- A ball with a speed of -20 m/s collides with the wall and bounces back with a speed of 10 m/s.

- The average force experienced by the ball should be determined if it is in contact with the wall.

- A ball traveling to the right collides with a ball at rest.
- The 2 km ball is traveling to the right at 2 m/s and the 1 km ball is traveling to the right at 8 m/s after impact.

- There is a perfect inelastic collision between a 3 kilo mass and a 2 kilo mass with an initial velocity of +3 m/s.

- A soldier loads a cannonball into a cannon that is at rest on the ground.

- A mechanical wheel at rest on the floor starts rolling forward with an acceleration of rad/s2.

- The bar is 1 m long.
- The far left side of the bar has a mass 1 attached to it.
- Mass 2 is on the far right side of the bar.

- A pulley with rope is connected to a box.

- A spring is attached to a block.
- The restoring force is 6 N when the block is pulled 5 cm to the right.

- A block with a force constant of 10 N/m is attached to a spring.

- A pendulum has a period of 2 s.

- The sound in the air is very fast.

- The tube has a sound speed of 343 m/s.

- The conductor blows the horn as the train approaches the next stop.

- Two of the suggested answers will be correct.
- Select the two answers that are the best in each case, and then fill in both of the circles on the answer sheet.

- The position-versus-time graph of an object is shown above.

- 2 are fixed in place and separated by 30 cm.

- A spring with a force constant of 40 N/m is attached to a block.

- A machine launches a ball to the right with an initial velocity of 16 m/s at a launched angle of 30deg to a student standing 20 m away with a baseball bat.

- The displacement is the same as the position of the explorer.

- The explorer's magnitude is 50i + 120j.

- The object must be moving in a negative direction because of the decreasing position.

- The magnitude of the velocity must be decreasing because the position of the object is decreasing at a slower rate.
- The choice is correct.

- The object is moving in the positive direction in section 1.
- The object is moving in the negative direction in section 2.

- The object is moving in the negative direction.
- The objet is moving in the negative direction in section 4.
- The choice is correct.

- When a projectile reaches the top of its trajectory, it's a zero.
- Thevelocity of projectiles is smallest at the apex of the trajectory as the horizontal velocity in standard parabolic motion is always constant.
- The choice is correct.
- The choice is incorrect as the projectile can still have a horizontal velocity, which is constant at all points of the trajectory.
- Projectiles can't have the maximum energy at the same time as they have the smallest velocity.

- How long does it take for the cannonball to hit the wall?
- This is a vertical question.

- The cannonball can clear the maximum height of the wall.

- There are two forces acting on the book in the horizontal direction, the force applied by the student and the normal force from the wall.
- There are two forces acting on the book in the vertical direction.
- The net force on the book must be zero in the horizontal and vertical directions in order for the student to hold the book.

- The student needs to apply a force of 25 N to hold the book in place.

- The weight of the box, the normal force of the inclined plane on the box, and the force applied are some of the forces acting on the box.
- The box's weight can be divided into two parts.

- A force of 76.6 N is needed to prevent the box from sliding.

- When the heavier car exerts a force on the smaller car, that small car exerts an equal but opposite force back onto the heavy car.
- Both forces have the same magnitude.

- The box has two forces acting on it: the weight of the box and the tension force from the string.

- The string's breaking strength limits the block's maximum speed.

- 30 m/s2 is equal to 90 J 18.

- The block has potential energy.

- Half of the potential energy of the block has been converted to kinetic energy at the halfway point.

- The force of friction reduces the energy of the block.

- The block has traveled 2 m as it is halfway down.

- 20,000 W 20 is 2000 N (30 m/s).

- The work can be calculated using the Work-Energy Theorem.

- The objects didn't stick together after the collision.

- The collision was inelastic because of the conserved energy.

- The total initial momentum is 0.
- The total final momentum must be equal to 0.

- The reading on the scale is the same as the magnitude of the downward scale that the man on the scale exerts.
- This is equivalent to the normal force exerted by the scale on the man.
- The normal force of the scale and the weight of the man are acting on the man.

- 5 m/s 31 is equal to 10 rad/s.

- The center of mass has shifted to the left.

- The weight of the box pulls down the rope, causing a Torque on the pulley.

- The mass of the object is proportional to rotational inertia.
- They have smaller masses, so eliminate them.
- The mass is from the axis of ration.
- The axis of rotation is farther away from a hollow ball than it is from a solid ball.
- The choice is correct.

- All of the energy from the block has been converted to potential energy.

- Standing waves have zero and maximum waves.

- In standing waves, complete constructive interference occurs at antinodes.
- The choice is correct.

- The number of the standing wave is 5 because of the expression for the wavelength of the nth harmonic.

- The electric force is the same.

- The person's perception of the sound of the horn is higher than the original sound of the train because of the Doppler effect.
- The person still sees a higher Frequency as the train slows, but it is not as high as it was.
- The person hears a decrease in the sound of the horn.
- The intensity of the horn is perceived by the person.

- 2 O + 4 O is 6 O 45.

- An object with a constant magnitude of acceleration is indicative of a parabolic position-versus-time graph.

- The object is moving in the negative direction because of the decreasing position.
- The speed of the object must be decreasing because the position of the object is decreasing at a slower rate.
- The choices are correct.

- The second wave rule states that when a wave passes into another medium, it's speed doesn't change.

- There are two true statements regarding objects undergoing uniform circular motion.
- The direction of the objects' velocity changes as they move in a circle.
- Choice is wrong.
- The center of the circle is where the centripetal acceleration is directed.
- Choice is wrong.

- The work done by conservative forces is independent.
- There is a conservative force.
- Nonconservative forces do work that is path dependent.
- Choice is wrong.
- Friction is not conservative.
- Choice is wrong.

- The type of wave and the characteristics of the medium determine the speed of a wave.
- The wave's speed does not depend on the wave's energy or Frequency.
- Choices A and B are not correct.

- 2 will always have a positive value.
- The two mass are traveling in opposite directions.
- 2 would be moving in a positive direction.

- The electric force between charges is attractive.

- The electric field is equal to the sum of the individual electric fields produced by each charge.

- 2 x 10-9 nC, 3 x 103 N/C, and 6 x 10-6 N 3.

- The spring's natural length would decrease by 0.025 m.

- The mass is trying to slide down the incline in the opposite direction as in (a).

- The student needs to hit the ball with the bat.

- The force is north of the west.

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- Title Page

- Copyright

- Acknowledgments

- Contents

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