cpb-us-e1.wpmucdn.com€¦ · Web viewPulling in her arms changes the moment of inertia. Angular velocity changes as a result. Time moves forward as usual. Only angular momentum,

Mr. Horton's Phat Physics Phinal Review 2013

____ 1. If a drag racer wins the final round of her race by going an average speed of 198.37 miles per hour in 4.537 seconds, what distance did he cover?a. 157,401 miles c. 0.2500 milesb. 2.500 miles d. 0.0121 miles

____ 2. What is the spring constant for a spring that stretches by 27 cm when a load of 200 N is suspended from it?a. 0.135 N/m c. 740 N/mb. 54 N/m d. 7.4 N/m

____ 3. If 320 J of work is done on a spring with a spring constant of 730 N/m, how far will it stretch?a. 0.58 m c. 0.61 mb. 0.87 m d. 0.94 m

____ 4. Which of the following does NOT represent Newton’s second law?a. a = m/F c. F = mab. m = F/a d. a = F/m

____ 5. An inelastic collision is one in whicha. kinetic energy before the collision equals kinetic energy after the collision.b. kinetic energy after the collision is zero.c. kinetic energy before the collision is less than kinetic energy after the collision.d. kinetic energy before the collision is greater than kinetic energy after the collision.

____ 6. What is the period of a pendulum near Earth’s surface that is 130 cm long?a. 2.3 s c. 9.1 sb. 0.83 s d. 22.9 s

____ 7. The magnitude of a vector represents its _____.a. velocity c. sizeb. direction d. color

____ 8. Construct a position-time graph that shows the forward progress of Sunny The Dog in a straight line for 20 meters over the course of 4 seconds.a. c.

b. d.

____ 9. If the period of a certain wave (wavelength = 4.5 m) is 2 seconds, what is the speed of the wave?

a. 0.44 m/s c. 9.0 m/sb. 1.1 m/s d. 2.3 m/s

____ 10. Which of the following is a pair of scalar quantities?a. velocity - distance c. time - speedb. velocity - displacement d. time - displacement

____ 11. In the diagram, the wavelength is shown by:

a. a c. cb. b d. d

____ 12. In the diagram, the trough of the wave is shown by:

a. a c. cb. b d. d

____ 13. In the diagram, the amplitude of the wave is shown by:

a. a c. cb. b d. d

____ 14. In the diagram, the crest of the wave is shown by:

a. a c. cb. b d. d

____ 15. Which conditions will result in the smallest change in momentum?a. a large force over a long time period c. a small force over a long time periodb. a large force over a short time period d. a small force over a short time period

____ 16. The normal force (FN) refers toa. the parallel contact force exerted by a surface on another object.b. the perpendicular contact force exerted by a surface on another object.c. the perpendicular tension exerted by a surface on a rope.d. the parallel acceleration of a body at terminal velocity.

____ 17. Assuming constant velocities, if a fastball pitch is thrown and travels at 40 m/s toward home plate, 18 m away, and the head of the bat is simultaneously traveling toward the ball at 18.0 m/s, how much time elapses before the bat hits the ball?a. About 0.3 s c. About 0.9 sb. About 0.6 s d. About 1.2 s

____ 18. A weight is hung from the ceiling of an elevator by a massless string. Under which circumstances will the tension in the cord be the smallest?a. The elevator is at rest.b. The elevator rises with increasing speed.c. The elevator descends with decreasing speed.d. The elevator descends with increasing speed.

____ 19. A rocket leaves a launch pad at liftoff with a great deal of upward momentum. What was initially given downward momentum?a. the launch pad c. the expelled fuelb. the astronauts aboard the rocket d. the entire Earth

____ 20. The path of a projectile through space is called its:a. equilibrant c. rangeb. torque d. trajectory

____ 21. Which is not an example of resonance?a. a basketball is dribbled down the courtb. a car bumper bounces back after a collisionc. a child swings higher as she is pushed on a swingd. a guitar string is repeatedly plucked

____ 22. The brightness of a light source sensed by the human eye depends only on the total luminous flux incident on the eye.

____ 23. Which is increased when the string of a stringed instrument is tightened?a. timbre c. wavelengthb. pitch d. loudness

____ 24. Which two notes are not an octave apart?a. 256 Hz and 512 Hz c. 331 Hz and 622 Hzb. 262 Hz and 524 Hz d. 277 Hz and 554 Hz

____ 25. The rate at which an object’s velocity changes is called its _____.a. acceleration c. displacementb. average velocity d. scalar magnitude

____ 26. A spring (k = 790 N/m) has a length of 48 cm when zero net force is applied to it. What will its length be when 230 N of force is applied to stretch it?a. 3.4 m c. 3.9 mb. 0.77 m d. 0.29 m

____ 27. A point on a wave completes one cycle every 5 seconds. The frequency of this wave is 1/5 seconds.

____ 28. A soldier throws a grenade horizontally from the top of a cliff. Which of the following curves best describes the path taken by the grenade?a. Circle c. Hyperbola

b. Ellipse d. Parabola

____ 29. Which of the following is a pair of vector quantities?a. Speed — Distance c. Velocity — Displacementb. Velocity — Distance d. Speed — Displacement

____ 30. To determine the y-component of a projectile’s velocity, what operation is performed on the angle of the launch?a. secant c. cosineb. tangent d. sine

____ 31. The speed is represented bya. the ratio of the change of position to the time interval during the change.b. the absolute value of the slope of a position-time graph.c. the instantaneous velocity.d. the time interval.

____ 32. An object that is shot through the air is called aa. protractor. c. parabola.b. projectile. d. proboscis.

____ 33. Analyze the collision of a baseball with a bat. During which portion of the collision does the baseball’s velocity reach zero?a. before the collisionb. during the collisionc. one second after the collisiond. one-hundredth of a second after the collision

____ 34. A light source moving toward an observer will appear to be at a higher frequency than its actual frequency.

____ 35. Tapping the surface of a pan of water generates 17.5 waves per second. If the wavelength of each wave is 45 cm, what is the speed of the waves?a. 7.9 m/s c. 39 m/sb. 790 m/s d. 2.6 m/s

____ 36. A weight is hung from the ceiling of an elevator by a massless string. Under which circumstances will the tension in the cord be the greatest?a. The elevator rises with decreasing speed.b. The elevator rises with increasing speed.c. The elevator is at rest.d. The elevator descends with increasing speed.

____ 37. The final position minus the initial position is thea. average velocity. c. time interval.b. motion diagram. d. displacement.

____ 38. What is the correct definition of momentum, p =a. ma c. mvb. mv2 d. mc2

____ 39. What is the proper unit for gravitational potential energy?a. gravitons c. Cruton’sb. joules d. Hammer heads

____ 40. Which formula represents final velocity of an object with average acceleration?a. vi = vf + at c. vf = vi atb. vf = vi at d. vf = vi + at

____ 41. If wavelength is kept constant, which increases as the speed of a wave increases?a. period c. amplitudeb. frequency d. phase

____ 42. Which shows the correct angle of reflection given the incident ray shown?a. c.

b. d.

____ 43. Force and acceleration are related in a linear fashion.

____ 44. Given a graph of velocity v. time, what does a horizontal line represent?a. The object’s acceleration is positive. c. The object’s acceleration is negative.b. The object is moving at constant velocity. d. The object is standing still.

____ 45. An object that has negative acceleration is definitely doing what?a. speeding upb. maintaining a constant speedc. slowing downd. accelerating in a direction that is opposite to a stated positive direction.

____ 46. Which type of energy is associated with a body’s height above the ground?a. thermal energy c. gravitational potential energyb. elastic potential energy d. rest energy

____ 47. Tension refers toa. the force exerted by a string. c. dynamic displacement.b. terminal velocity. d. free fall.

____ 48. Which material is likely to experience a highly inelastic collision?a. a steel ball on a steel plateb. a car with compressed springs in its bumperc. a lump of clayd. a baseball thrown against a trampoline

____ 49. Which of the following is NOT an example of accelerated motion?a. a boulder falling off of a cliff in a straight path

b. an airplane taking off down a straight runwayc. a bicyclist moving in a straight line at constant speedd. a ball being thrown straight up

____ 50. The example of a book falling off of a table shows a(n) _____.a. contact force c. absence of accelerationb. scalar quantity d. field force

____ 51. The unit for frequency is Hertz, or cycles per second.

____ 52. The acceleration due to Earth’s gravity is:a. 9.8 m/s2 c. 9.8 ft/s2

b. 98 m/s2 d. 9.8 mi/s2

____ 53. Which of the following is not true about a free body diagram?a. All forces point away from the particle.b. The arrows are proportional to the size of the forces.c. The system is represented by a particle model.d. You always know the magnitude of the forces ahead of time.

____ 54. The law of conservation of momentum states that the momentum of a closed, isolated system does not change.

____ 55. A racehorse is running with a uniform speed of 69 km/hr along a straightaway. What is the time it takes for the horse to cover 400 meters?a. 21 seconds c. 0.35 hoursb. 2.1 minutes d. 27.6 hours

____ 56. Analyze the graph. Which quantity is equal to the impulse?

a. The area around the football field c. The size of an elephants shoeb. distance along curve d. area under the curve

____ 57. “ FA on B = -FB on A” is an expression ofa. Horton’s first law c. Newton’s third lawb. Newton’s second law d. Fig Newton’s law

____ 58. Which characteristic of sound is associated with frequency?a. pitch c. pressureb. loudness d. timbre

____ 59. The change in velocity during a measurable time interval, divided by the time interval, is the _____.a. instantaneous velocity c. instantaneous accelerationb. average velocity d. average acceleration

____ 60. The path through space followed by a projectile is called thea. trajectory. c. thrust.b. transparency. d. acceleration due to gravity.

____ 61. A pendulum clock is taken to the moon (g = 1.6 m/s2). How long must the pendulum be in order for the clock to continue keeping accurate time (1 second/cycle)?a. 3.2 m c. 0.25 mb. 7.9 m d. 0.041 m

____ 62. A force cannot exist without an agent and a system.

____ 63. Duplain St. is 300 m long and runs from west to east between Baron and Burkey. If Keith is strolling east from Baron at an average velocity of 3 km/hr, and Sue is power-walking west from Burkey at an average velocity of 6 km/hr, how long will it take them to meet?a. 1 minute c. 3 minutesb. 2 minutes d. 6 minutes

____ 64. How much work must be done on a spring (k = 730 N/m) to stretch is by 1.5 m?a. 821 J c. 1643 Jb. 548 J d. 649 J

____ 65. A grandfather clock keeps time using a pendulum. Which will be true of the clock if the pendulum is shortened?a. It will run slow. c. It will keep the same time.b. It will run fast. d. It will depend on the bob’s mass.

____ 66. To determine the x-component of a projectile’s velocity, what operation is performed on the angle of the launch?a. secant c. cosineb. tangent d. sine

____ 67. When an object is in equilibrium, the net force is _____.a. zero c. negativeb. positive d. changing

____ 68. A closed-pipe resonator can produce sounds that have wavelengths that are four times the length of the pipe.

____ 69. In a free body diagram, the force arrows always point _____.a. away from the particle c. both toward and away from the particleb. toward the particle d. at right angles to each other

____ 70. What is the formula to find speed of light?a. c = /f c. c = f/b. c = f d. 2/f

____ 71. Which of the following system of forces provides the block the highest net force?

a.

11 N 71 N

c.

227 N 153 N

b.

405 N 403 N

d.

22.7 N 15.3 N

____ 72. When the drag force on an object falling through the air equals the force of gravity, the object has reacheda. terminal force. c. terminal illness.b. terminal acceleration. d. terminal velocity.

____ 73. An elastic collision is one in whicha. kinetic energy before the collision equals kinetic energy after the collision.b. kinetic energy after the collision is zero.c. kinetic energy before the collision is less than kinetic energy after the collision.d. kinetic energy before the collision is greater than kinetic energy after the collision.

____ 74. The instantaneous acceleration of an object isa. the rate of change in velocity at an instant of time.b. the rate of change of position at an instant of time.c. the rate of change of speed at an instant of time.d. the rate of change of time at an instantaneous position.

____ 75. Which quantity does not change when an ice skater pulls in her arms during a spin?a. angular momentum c. moment of inertiab. angular velocity d. time

Mr. Horton's Phat Physics Phinal Review 2012Answer Section

1. ANS: C4.537 seconds/60sec per min = 0 .07562 min0 .07562 min/60 min per hr = 0.001260 hr

(198.37 mph)(0.001260 hr) = 0.2500 miles

PTS: 1 DIF: Bloom's Level 3 REF: p. 44NAT: B.4 STA: SP1.a | SPS8.a

2. ANS: C

For the elastic force on a spring, F = Here, 200 N/ 0.27 m = 740 N/m.

PTS: 1 DIF: Bloom's Level 3 REF: p. 376NAT: UCP.3 STA: SP3.b

3. ANS: D


4. ANS: ANewton’s second law is F = ma, a = F/m, or m = F/a.

PTS: 1 DIF: Bloom’s Level 2 REF: p. 93NAT: B.4 STA: SPS8.b

5. ANS: DIn an inelastic collision, kinetic energy is converted to another type of energy.

PTS: 1 DIF: Bloom's Level 1 REF: p. 298NAT: B.5 | B.6 STA: SP3.c | SPS7.a

6. ANS: A

=


7. ANS: CA vector’s magnitude represents the vector’s size.

PTS: 1 DIF: Bloom's Level 1 REF: p. 35NAT: B.4 STA: SP1.b | SPS8.a

8. ANS: B

A position-time diagram shows the distance traveled over a time interval. The slope of the line is the distance (20 m) divided by the time (4 s). Answer B shows a line with the slope of 20/4 = 5m/s, in the positive direction.

PTS: 1 DIF: Bloom's Level 4 REF: p. 38NAT: B.4 STA: SCSh5.e | SPS8.a

9. ANS: D


10. ANS: CTime and speed are scalar quantities. (Distance is scalar also.) Velocity and displacement are vector quantities.

PTS: 1 DIF: Bloom's Level 2 REF: p. 35NAT: B.4 STA: SP1.b | SPS8.b

11. ANS: CThe wavelength of a wave is the distance between successive crests.

PTS: 1 DIF: Bloom's Level 2 REF: p. 383NAT: B.6 STA: SP3.b

12. ANS: BThe trough of a wave is the bottom of the wave.


13. ANS: AThe amplitude of a wave is half the height of the wave from crest to trough.

PTS: 1 DIF: Bloom's Level 2 REF: pp. 382-383NAT: B.6 STA: SP3.b

14. ANS: DThe crest of a wave is the top of the wave.


15. ANS: DImpulse is directly proportional to both force and time.

PTS: 1 DIF: Bloom's Level 2 REF: p. 230NAT: B.4 STA: SP3.d | SP3.a

16. ANS: BThe perpendicular contact force exerted by a surface on another object is called the normal force.

PTS: 1 DIF: Bloom’s Level 1 REF: p. 107NAT: B.4 STA: SPS8

17. ANS: A

Assume that the bat and ball are traveling on the same line, but in opposite directions. Draw the position-time graph for each and read the time from where the lines cross:

PTS: 1 DIF: Bloom's Level 4 REF: pp. 38-40, 43NAT: B.4 STA: SP1.a | SPS8.a

18. ANS: DThe tension in the cord will be greatest if the cord allows the elevator to accelerate downward.

PTS: 1 DIF: Bloom’s Level 4 REF: p. 98NAT: B.4 STA: SPS8.a | SP1

19. ANS: CA rocket does not need to push against a launch pad to lift off. Instead, the action of the fuel exiting the rocket results in the rocket moving in the opposite direction.


20. ANS: DA projectile is any object that has been given an initial thrust and moves through air. Its path through space is called its trajectory.

FeedbackA Equilibrant is a type of force.B Torque is the product of the force and length of the lever arm.C Range is the horizontal distance traveled by a projectile.D Correct!

PTS: 1 DIF: Bloom’s Level 1 REF: Page 147OBJ: 6.1.1 Recognize that the vertical and horizontal motions of a projectile are independent.NAT: B.4TOP: Recognize that the vertical and horizontal motions of a projectile are independent.KEY: Projectile, Trajectory MSC: 1NOT: /a/ Equilibrant is a type of force. /b/ Torque is the product of the force and length of the lever arm. /c/ Range is the horizontal distance traveled by a projectile. /d/ Correct!

21. ANS: BResonance requires a motion that is repeated again and again.

PTS: 1 DIF: Bloom's Level 3 REF: p. 380NAT: B.6 STA: SP4.c

22. ANS: TThe luminous flux represents the capacity of the source to produce brightness.

PTS: 1 DIF: Bloom's Level 1 REF: Page 433OBJ: 16.1.2 Predict the effect of distance on light's illuminance.STA: SP4.a TOP: Predict the effect of distance on light's illuminance.KEY: Luminous flux MSC: 1NOT: /T/ Correct! /F/ The luminous flux represents the capacity of the source to produce brightness.

23. ANS: BWhen the string of a stringed instrument is tightened, the pitch produced is increased.

PTS: 1 DIF: Bloom's Level 3 REF: pp. 414-415NAT: B.6 STA: SPS9.d

24. ANS: CTwo notes are an octave apart if and only if the frequency of one note is exactly twice the frequency of the other note.

PTS: 1 DIF: Bloom's Level 3 REF: p. 418NAT: UCP.3 STA: SCSh5.e

25. ANS: AThe rate at which an object’s velocity changes is called its acceleration.


26. ANS: B230 = 790 x or 230/790 = .29 m or 29 cm.

The total length is then 0.29 m + 0.48 m = 0.77 m.


27. ANS: TThe frequency of a wave equals the inverse of the period of that wave.


28. ANS: DDraw a motion diagram for the trajectory showing the downward acceleration. The velocity will have two components, a horizontal and a vertical component. The combination of constant horizontal velocity and uniform vertical acceleration produces a distinct trajectory.

FeedbackA A circular path would mean that the grenade falls on the soldier!B The grenade cannot take an elliptical path as gravity would act on it.C The trajectory of the grenade cannot be a hyperbola as Earth would exert a gravitational

pull on it.D Correct!

PTS: 1 DIF: Bloom’s Level 1 REF: Page 148OBJ: 6.1.3 Explain how the shape of the trajectory of a projectile depends upon the frame of reference from which it is observed. NAT: B.4 STA: SP1.c | SP1.fTOP: Explain how the shape of the trajectory of a projectile depends upon the frame of reference from which it is observed. KEY: Projectile, TrajectoryMSC: 1NOT: /a/ A circular path would mean that the grenade falls on the soldier! /b/ The grenade cannot take an elliptical path as gravity would act on it. /c/ The trajectory of the grenade cannot be a hyperbola as Earth would exert a gravitational pull on it. /d/ Correct!

29. ANS: CVelocity and displacement are vector quantities.

FeedbackA Speed and distance are scalar quantities.B Velocity is a vector, but distance is scalar.C Correct!D Displacement is a vector, but speed is scalar.

PTS: 1 DIF: Bloom’s Level 1 REF: Page 35OBJ: 2.2.3 Define displacement. NAT: B.4 STA: SP1.bTOP: Define displacement. KEY: Vectors MSC: 1NOT: /a/ Speed and distance are scalar quantities. /b/ Velocity is a vector, but distance is scalar. /c/ Correct! /d/ Displacement is a vector, but speed is scalar.

30. ANS: D

PTS: 1 DIF: Bloom’s Level 2 REF: p. 150NAT: B.4 STA: SPS8.a | SPS8

31. ANS: BSpeed is the absolute value of velocity, which is the slope of a position-time graph.


32. ANS: BThe only force on a projectile is the force of gravity.

PTS: 1 DIF: Bloom’s Level 1 REF: p. 147NAT: B.4 STA: SCSh3.b

33. ANS: BDuring the collision, the baseball goes from a negative velocity to a positive velocity. At some point, the velocity is zero.


34. ANS: TA light source moving toward an observer will appear blue-shifted.

PTS: 1 DIF: Bloom's Level 2 REF: p. 446

NAT: B.6 STA: SP4.b35. ANS: A


36. ANS: BThe tension in the cord will be greatest if the cord is accelerating the elevator upward.

PTS: 1 DIF: Bloom’s Level 4 REF: p. 98NAT: B.4 STA: SPS8.a | SP1

37. ANS: DDisplacement is the vector difference between initial and final positions.


38. ANS: CMomentum is mass times velocity.


39. ANS: BLike all other forms of energy, gravitational potential energy can be measured in joules.

PTS: 1 DIF: Bloom's Level 1 REF: p. 289NAT: B.5 | B.6 STA: SP1 | SP1.e

40. ANS: Dvf = vi + atThe final velocity of an object is its initial velocity, plus the product of the average acceleration and the time interval.

PTS: 1 DIF: Bloom's Level 2 REF: p. 65NAT: B.4 STA: SPS8.a | SP1.a

41. ANS: Bwave speed =


42. ANS: CThe angle of incidence equals the angle of reflection.


43. ANS: TF = ma, so F

PTS: 1 DIF: Bloom’s Level 2 REF: pp. 90-91NAT: B.4 STA: SPS8 | SP1

44. ANS: B

Given a graph of velocity v. time, a horizontal line represents an object that is moving at constant velocity. The slope of the line represents acceleration, and if the acceleration is zero, the velocity is constant.

PTS: 1 DIF: Bloom's Level 3 REF: pp. 58-59NAT: B.4 STA: SP1.a | SPS8.a

45. ANS: DAn object that has negative acceleration is not slowing down if the velocity is also negative.

PTS: 1 DIF: Bloom's Level 1 REF: pp. 58-60NAT: B.4 STA: SPS8.a | SP1.a

46. ANS: CGravitational potential energy is defined in relation to a reference level where gravitational PE is zero.

PTS: 1 DIF: Bloom's Level 1 REF: pp. 288-289NAT: B.5 | B.6 STA: SPS8.c | SPS8.d

47. ANS: AThe force exerted by a string or rope is called tension.

PTS: 1 DIF: Bloom’s Level 1 REF: p. 105NAT: B.6 STA: SP3.a

48. ANS: CThe lump of clay will lose kinetic energy by changing its shape as it collides with another object.


49. ANS: CA bicyclist moving in a straight line at constant speed has constant velocity and therefore zero acceleration.


50. ANS: DA field force causes the book to fall.

PTS: 1 DIF: Bloom’s Level 2 REF: p. 88NAT: B.4 STA: SPS8.c | SP1

51. ANS: TOne Hertz is equal to the number of cycles that an oscillator completes in one second.


52. ANS: AThe acceleration due to Earth’s gravity is 9.8 m/s2


53. ANS: DYou do not always know the magnitude of the forces ahead of time for a free-body diagram.

PTS: 1 DIF: Bloom’s Level 2 REF: p. 89NAT: B.4 STA: SPS8 | SPS8.a

54. ANS: TThis law applies only to closed, isolated systems.


55. ANS: A(400 m)(1 km/1000 m) = 0.4 km

(0.4 km)(1 hr/69 km)(60 min/1 hr)(60 s/1 min) = 20.86 s = 21 s


56. ANS: DWhen force is not constant, impulse is given by the area under the force v. time curve.


57. ANS: CNewton’s third law states that every force of A on B has an equal and opposite force of B on A.

PTS: 1 DIF: Bloom’s Level 1 REF: pp. 102-103NAT: B.4 STA: SPS8.b

58. ANS: AThe frequency of a sound determines the sound’s pitch.

PTS: 1 DIF: Bloom's Level 2 REF: p. 406NAT: B.6 STA: SPS9.b

59. ANS: DThe average acceleration of an object is defined as the change in velocity during a measurable time interval, divided by the time interval.


60. ANS: AA projectile follows a trajectory through space.

PTS: 1 DIF: Bloom’s Level 1 REF: p. 147NAT: B.4 STA: SCSh3.b

61. ANS: D

We want 1 s = or l =


62. ANS: TA force needs something to create the force and something to experience the force.

PTS: 1 DIF: Bloom’s Level 1 REF: p. 88NAT: B.4 STA: SP1.b | SPS8

63. ANS: BSue is walking west at 6 km/hr = 6000m/60min = 100m/min.Keith is walking east at 3 km/hr = 3000m/60 min = 50m/min.By constructing a position-time graph for the two walkers, it can be seen that they will intersect after 2 minutes (Sue will have traveled 200 m, and Keith will have traveled 100 m.)(Keith is dashed, Sue is solid.)

PTS: 1 DIF: Bloom's Level 3 REF: pp. 38-40, 43NAT: B.4 STA: SP1.a | SPS8.a

64. ANS: A


65. ANS: BThe period of the pendulum is shorter if the pendulum itself is shortened.


66. ANS: C

PTS: 1 DIF: Bloom’s Level 2 REF: p. 150NAT: B.4 STA: SPS8.c | SP1.f

67. ANS: AThe net force on an object in equilibrium is zero.

PTS: 1 DIF: Bloom’s Level 2 REF: p. 92NAT: B.4 STA: SP1.f | SPS8.a

68. ANS: TThe longest wave that can fit in a closed pipe resonator is four times the length of the pipe.

PTS: 1 DIF: Bloom's Level 2 REF: p. 413NAT: B.6 STA: SPS9.d

69. ANS: AThe force arrows of a free-body diagram always point away from the particle.

PTS: 1 DIF: Bloom’s Level 2 REF: p. 89NAT: B.4 STA: SPS8 | SPS8.a

70. ANS: BIn the ray model of light, light is represented as a ray that travels in a straight path.

FeedbackA The speed of light is directly proportional to the frequency of light.B Correct!C The speed of a light wave is directly proportional to its wavelength.D The wavelength of a wave is a linear function of its speed.

PTS: 1 DIF: Bloom's Level 1 REF: Page 445STA: SP4.a TOP: Speed of light wave. KEY: Speed of lightMSC: 2NOT: /a/ The speed of light is directly proportional to the frequency of light. /b/ Correct! /c/ The speed of a light wave is directly proportional to its wavelength. /d/ The wavelength of a wave is a linear function of its speed.

71. ANS: C

FeedbackA Correct!B The difference between the forces is not the maximum.C The net force is the difference between the two forces.D This system does not give the highest net force.

PTS: 1 DIF: Bloom’s Level 1 REF: Page 87OBJ: 4.1.1 Define force. NAT: B.4 STA: SP1.dTOP: Define force. KEY: Force MSC: 1NOT: /A/ Correct! /B/ The difference between the forces is not the maximum./C/ The net force is the difference between the two forces. /D/ This system does not give the highest net force.

72. ANS: DAn object reaches terminal velocity when the drag force equals the gravitational force on the object.

PTS: 1 DIF: Bloom’s Level 2 REF: pp. 100-101NAT: B.4 STA: SPS8.c | SPS8.a

73. ANS: AIn an elastic collision, kinetic energy is conserved.


74. ANS: A

Instantaneous acceleration is at an instant in time.


75. ANS: APulling in her arms changes the moment of inertia. Angular velocity changes as a result. Time moves forward as usual. Only angular momentum, the product of angular velocity and moment of inertia, stays the same.

PTS: 1 DIF: Bloom's Level 2 REF: pp. 243-244NAT: B.4 STA: SP3.d | SP3.a

Documents

cpb-us-e1.wpmucdn.com€¦ · Web viewPulling in her arms changes the moment of inertia. Angular velocity changes as a result. Time moves forward as usual. Only angular momentum,