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13 -- Part 2: Answers and Explanations to the Chapter Review Questions

- 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.
- 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 object is thrown from a high cliff with an initial speed of 7.5 m/s.

- The downward pull of gravity and the upward normal force of the floor act on a person standing on a horizontal floor.

- There are two objects with a mass of 1 kg and a charge of 1 C each.

- There is a massless rope and pulley attached to a plane.

- The plane and pulley are massless.

- The platform rotates.

- The moon has an elliptical path around the planet.

- A sphere starts from the top of a hill with a constant angle of inclination and is able to roll.

- Assume that the object strikes the ground before it reaches the terminal.

- The boy and girl are not close to each other, and that tilts in favor of the boy.

- Two objects, a sphere and a block of the same mass, are released from rest at the top of an inclined plane.
- The sphere rolls down the plane.
- The block slides down the plane.

- The mass is in contact with the tracks.

- A linear, elastic collision takes place with a stationary object.

- The force on the block by the table is zero parallel to the table and zero parallel to the table.

- Two objects are in a head-on collision.

- There are two balls of equal mass in the picture above.

- The pendulum can only be displaced by a small amount.

- Someone dug a hole through the center of the Earth to the other side.
- The object can't be destroyed if the conditions are ideal.

- The carnival ride looks like a cylinder.
- People stand against the wall as the cylinder spins.

- The floor can be removed without anyone falling once it is rotating fast.

- The maximum speed of the block is proportional to the square root of the amplitude and the square root of the C.

- A flute supports waves.
- A flute can play only the lowest note.
- You are standing on a railroad track as a train approaches.
- The engineer sounds the whistle when he sees you.

- A 500 O Resistor is connected to a variable voltage source.
- The graph shows that the voltage is increased linearly from 0 V to 5 V over a period of 20 s.

- There are four charges in the figure.

- 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.

- Block A collides with Block B, which is initially at rest, and sticks to it.

- You need to include all the additional equipment.
- You can include a diagram of your setup in your description.
- Tell us what you would take and how you would do it.

- Provide enough detail so that the experiment can be repeated.

- A string is 2.2 meters long and has a conical pendulum hanging from it.
- It makes a circle.
- There is a ball at the end of the string.

- In your diagram, direction is used.

- There are three particles in a horizontal plane.
- The sign of the charge in Particle 1 is not known.
- Particle 2 has a charge that has a magnitude of 1.7 and the sign of the charge is not known.

- Particle 2 exerts force on Particle 3.

- The diagram shows 0 as shown on the left.

- The spring has very little mass.

- Also include a description of the units.

- You can include a diagram of your setup in your description.

- Two small objects, each with a charge of -4.0 nC, are held together by a 0.020 m length of insulating string in the above diagram.
- The objects are at rest on a surface that is notconducting.
- The effects of gravity on each other are insignificant.

- The string is being cut.

- The vertical speed of the object after 2 seconds is 20 m/s.
- The direction will be mostly down, but slightly to the right, because the horizontal speed won't be affected.

- Mass isn't changing, so you only have to consider the changes in velocity.
- Each segment has a change in velocity of +7 m/s, 0 m/s, -4 m/s, and -2 m/s.

- The question doesn't specify magnitude, so all negatives will come before the others.

- The change in time affects the change in velocity.
- The times for each segment are in order, 3 s, 2 s, 1 s, 3 s, and 2 s.

- The area beneath the curve is called displacement.
- A negative displacement would be added to the axis.
- There is no distinction between positive and negative velocity for this question because distance cannot be negative.

- The ball is at the highest point from the ground.

- The Big Five equation can be used to find the distance traveled in the last second.

- The question is about the distance.

- The weight and normal force balance out because the floor is horizontal.
- The two forces do not form an action-reaction pair.
- Two forces must act on each other in order to form an action-reaction.
- Earth's pull on the person, weight, and the person's pull on Earth is the correct action-reaction pair in this situation.

- The force of force on a stationary object will oppose the force applied to it until it reaches a maximum.

- The eliminations are (B) and (D).
- When enough force is applied, the friction will change from static to kinetic.
- This eliminates the value of the kruin.

- All variables will have the same numerical values.
- It comes down to the constants.
- The electric force will be greater because Coulomb's constant is much greater than the gravitational constant.
- The signs of the charges are irrelevant because of the question.

- The answer is (B) because you know you need a sine in the equation for the downward pull of the second mass down the incline of the plane.

- The acceleration of any block in the system is the same as that of any other block because all the mass is attached and moving as a single unit.

- If the centripetal force is at least as much as the force of gravity on the cart, the cart will remain in contact at the top of the loop.

- There is only one true statement regarding rotational motion.
- A mass with more inertia is harder to rotate.
- The closer the mass is to the axis of rotation, the greater the inertia.
- The object moves toward the center of rotation.

- The moon's gravity will be equal to the moon's gravity on the planet.

- The correct way to find distance is with the help of the two others.

- You can find the moon's speed with the help of energy.
- It is possible to find the distance of the Moon from the planet.

- The object is affected by gravity but it doesn't provide the Torque.
- The normal force does not work on the object nor does it provide the Torque.
- The Torque is provided by the friction in this case.

- The ball is rolling down the hill and not sliding down it.
- It makes sense, because when you drive a car the tires grip the road and move you forward at one point.
- If there was no static friction on the road, you wouldn't be able to go anywhere because the tires wouldn't grip onto anything.

- In free fall, an object's terminal speed is its highest speed.
- The speed must still be increasing if it has not yet reached it.
- The eliminations are (C) and (D).
- As speed increases, the object will experience a drag force that increases.
- The net force will decrease since the force from gravity will be constant.
- acceleration will decrease if net force decreases.

- The net force of an object is called the centripetal force.
- It does not have an actionreaction pair.
- The eliminations are (A) and (B).
- The speed of the object in uniform circular motion is constant, but its direction changes with time.
- The centripetal acceleration always points to the center of the circle.
- This eliminates.
- A satellite falling toward the center, but never achieving its goal, is due to its centripetal acceleration.
- As a result of the change in velocity, it would always form a circular path.

- You have to balance the see-saw.

- The choices would double the girl's side Torque and cut the boy's side Torque.

- The boy's Torque would be cut in half, but the girl's Torque would be increased, creating a new imbalance.

- Centripetal force can't ever work because it acts as if the object is moving in a straight line.

- The coefficient of friction would not change because the two materials were in contact.
- The normal force would remain constant because the object's mass would be the same.

- The same amount of energy is used for the objects to go from the top to the bottom.
- Some of the energy will need to be from the rotation of the sphere.
- The block will reach the bottom of the incline first.

- The object has to climb up to decrease its speed, then come back down to its original speed.

- The initial speed is always below during this time.
- The object's initial speed is the same for Path 2.
- As it goes down the path, the object speeds up and then slows down as it climbs.
- The speed is always above the initial speed.

- Both energy and momentum will be conserved for an elastic collision.

- Since the object started at rest, 2,0 is also known to be 0 m/s.
- You can have two unknowns with two equations.
- D is correct.

- The table's surface will have a normal that is parallel to the surface.
- The total force from the table will not be parallel to the surface.

- The force of gravity is acting on the incline.
- The forces in both directions are equal when the box moves upwards.

- The objects have different velocities after a collision and can be immediately eliminated.
- If the energy is conserved, a collision is elastic.

- The collision must be elastic because of the conserved energy.

- There is no change in the ball's horizontal motion in the picture.
- Ball A moves up after the collision.
- The impulse it received is up.

- The centripetal force is the same as the tension and the radial component of gravity.

- The radial component of gravity must have a larger magnitude than the tension.
- The two will be equal at the maximum displacement.
- The correct answer is (B).

- This situation is similar to a spring-block system.
- It would start with some potential energy at one extreme edge, turn it into energy that can be used in other ways, as it moved to the center, and then continue to the other edge due to its momentum.
- In ideal conditions, this process would continue indefinitely.

- This is a rule.

- An example of an actionreaction pair is the forces during a collision.
- The force on the car will be the same in magnitude as it is in direction.
- The forces are in opposite directions.
- Newton's Second Law states that the lighter object will have more force than the heavier object.
- The answer is (B).

- The force of friction needs to be equal to the force of gravity in order to stay in place.

- Next, find the normal force.
- The normal force is equal to the centripetal force when the person is undergoing uniform circular motion.

- The mass drops out of the equation.

- The coefficients of friction, speed, and the radius are the only variables that matter.

- In order for the small block to slide off, there needs to be a big force affecting the larger block.

- The heavier the top block is, the more likely it is to slide off.

- The fundamental frequencies of the flute are the lowest notes that can be played.

- The intensity will increase if the train is approaching you.
- The pitch is determined by the effect.
- The detector is motionless, but the source is moving towards it.
- The pitch will decrease because the brakes of the train will reduce the speed of the train.

- The first thing to do is replace the resistors with an equivalent one.

- The current is the same in 3 of the series.
- There is 3.
- 3 is equal to 60 V 41.

- The total resistance in the circuit would increase if 1 were to burn out.

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