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###### Physics 9th Edition Cutnell- Test Bank

Chapter: Chapter 2 Multiple Choice

- A particle travels along a curved path between two points P and Q as shown. The displacement of the particle does
*not*depend on - A) the location of P.
- B) the location of Q.
- C) the distance traveled from P to Q.
- D) the shortest distance between P and Q.
- E) the direction of Q from P.

Ans: CDifficulty: MediumSectionDef: Section 2-1 and 2-2

- For which one of the following situations will the path length equal the magnitude of the displacement?
- A) A toy train is traveling around a circular track.
- B) A ball is rolling down an inclined plane.
- C) A train travels 5 miles east before it stops. It then travels 2 miles west.
- D) A ball rises and falls after being thrown straight up from the earth’s surface.
- E) A ball on the end of a string is moving in a vertical circle.

Ans: BDifficulty: EasySectionDef: Section 2-1 and 2-2

- Which one of the physical quantities listed below is
*not*correctly paired with its SI unit and dimension?

__ __

Quantity |
Unit |
Dimension |

- A)

velocity | m/s | [L]/[T] |

- B)

path length | m | [L] |

- C)

speed | m/s | [L]/[T] |

- D)

displacement | m/s^{2} |
[L]/[T]^{2} |

- E)

speed × time | m | [L] |

Ans: DDifficulty: EasySectionDef: Section 2-1 and 2-2

- A car travels in a straight line covering a total distance of 90.0 miles in 60.0 minutes. Which one of the following statements concerning this situation is
*necessarily*true? - A) The velocity of the car is constant.
- B) The acceleration of the car must be non-zero.
- C) The first 45 miles must have been covered in 30.0 minutes.
- D) The speed of the car must be 90.0 miles per hour throughout the entire trip.
- E) The average velocity of the car is 90.0 miles per hour in the direction of motion.

Ans: EDifficulty: EasySectionDef: Section 2-1 and 2-2

- At time
*t*= 0 s, an object is observed at*x*= 0 m; and its position along the*x*axis follows this expression:*x*= –4*t*+*t*^{2}, where the units for distance and time are meters and seconds, respectively. What is the object’s displacement D*x*between*t*= 1.0 s and*t*= 3.0 s? - A) +16 m
- B) –21 m
- C) +10 m
- D) +2 m
- E) –5 m

Ans: ADifficulty: MediumSectionDef: Section 2-1 and 2-2 Reference: Ref 2-1 Peter noticed a bug crawling along a meter stick and decided to record the bug’s position in five-second intervals. After the bug crawled off the meter stick, Peter created the table shown.

- What is the displacement of the bug between
*t*= 0.00 s and*t*= 20.0 s? - A) +39.9 cm
- B) –39.9 cm
- C) +65.7 cm
- D) –16.1 cm
- E) +16.1 cm

Ans: ERefer To: Ref 2-1Difficulty: EasySectionDef: Section 2-1 and 2-2

- What is the total distance that the bug traveled between
*t*= 0.00 s and*t*= 20.0 s? Assume the bug only changed directions at the end of a five-second interval. - A) 9 cm
- B) 7 cm
- C) 1 cm
- D) 1 cm
- E) 5 cm

Ans: ARefer To: Ref 2-1Difficulty: MediumSectionDef: Section 2-1 and 2-2

- In the process of delivering mail, a postal worker walks 161 m, due east from his truck. He then turns around and walks 194 m, due west from his truck. What is the worker’s displacement relative to his truck?
- A) 33 m, due west
- B) 33 m, due east
- C) 194 m, due west
- D) 252 m, due east
- E) 355 m, due west

Ans: ADifficulty: EasySectionDef: Section 2-1 and 2-2

- A Canadian goose flew 845 km from Southern California to Oregon with an average speed of 28.0 m/s. How long, in hours, did it take the goose to make this journey?
- A) 7 h
- B) 33 h
- C) 1 h
- D) 70 h
- E) 38 h

Ans: EDifficulty: MediumSectionDef: Section 2-1 and 2-2

- When the outdoor emergency warning siren at Cheryl’s school was tested, the sound from the siren took 7.0 s to reach her house located 2.40 km from the school. What is the speed of sound in air?
- A) 240 m/s
- B) 340 m/s
- C) 440 m/s
- D) 540 m/s
- E) 640 m/s

Ans: BDifficulty: EasySectionDef: Section 2-1 and 2-2

- A bus leaves New York City, takes a non-direct route and arrives in St. Louis, Missouri 23 hours, 16 minutes later. If the distance between the two cities is 1250 km, what is the magnitude of the bus’ average velocity?
- A) 2 km/h
- B) 4 km/h
- C) 0 km/h
- D) 7 km/h
- E) 1 km/h

Ans: DDifficulty: EasySectionDef: Section 2-1 and 2-2

- Alexa’s hair grows with an average speed of 3.5 × 10
^{–9}m/s. How long does it take her hair to grow 0.30 m? Note: 1 yr = 3.156 × 10^{7}s. - A) 9 yr
- B) 3 yr
- C) 37 yr
- D) 4 yr
- E) 7 yr

Ans: EDifficulty: MediumSectionDef: Section 2-1 and 2-2

- Carl Lewis set a world record for the 100.0-m run with a time of 9.86 s. If, after reaching the finish line, Mr. Lewis walked directly back to his starting point in 90.9 s, what is the magnitude of his average velocity for the 200.0 m?
- A) 0 m/s
- B) 10 m/s
- C) 98 m/s
- D) 60 m/s
- E) 1 m/s

Ans: ADifficulty: HardSectionDef: Section 2-1 and 2-2

- During the first 18 minutes of a 1.0-hour trip, a car has an average speed of 11 m/s. What must the average speed of the car be during the last 42 minutes of the trip be if the car is to have an average speed of 21 m/s for the entire trip?
- A) 21 m/s
- B) 23 m/s
- C) 25 m/s
- D) 27 m/s
- E) 29 m/s

Ans: CDifficulty: HardSectionDef: Section 2-1 and 2-2

- A turtle takes 3.5 minutes to walk 18 m toward the south along a deserted highway. A truck driver stops and picks up the turtle. The driver takes the turtle to a town 1.1 km to the north with an average speed of 12 m/s. What is the magnitude of the average velocity of the turtle for its entire journey?
- A) 6 m/s
- B) 8 m/s
- C) 0 m/s
- D) 6 m/s
- E) 11 m/s

Ans: ADifficulty: HardSectionDef: Section 2-1 and 2-2 Reference: Ref 2-2 A racecar, traveling at constant speed, makes one lap around a circular track of radius *r* in a time *t*. Note: The circumference of a circle is given by *C* = 2p*r.*

- When the car has traveled halfway around the track, what is the magnitude of its
*displacement*from the starting point? - A)
*r* - B) 2
*r* - C) p
*r* - D) 2p
*r* - E) zero meters

Ans: BRefer To: Ref 2-2Difficulty: EasySectionDef: Section 2-1 and 2-2

- What is the
*average speed*of the car for one complete lap? - A)
- B)
- C)
- D)
- E) zero meters/second

Ans: DRefer To: Ref 2-2Difficulty: MediumSectionDef: Section 2-1 and 2-2

- Determine the
*magnitude*of the*average velocity*of the car for one complete lap. - A)
- B)
- C)
- D)
- E) zero meters/second

Ans: ERefer To: Ref 2-2Difficulty: MediumSectionDef: Section 2-1 and 2-2

- Which one of the following statements concerning this car is true?
- A) The displacement of the car does not change with time.
- B) The instantaneous velocity of the car is constant.
- C) The average speed of the car is the same over any time interval.
- D) The average velocity of the car is the same over any time interval.
- E) The average speed of the car over any time interval is equal to the magnitude of the average velocity over the same time interval.

Ans: CRefer To: Ref 2-2Difficulty: MediumSectionDef: Section 2-1 and 2-2

- In which one of the following situations does the car have a westward acceleration?
- A) The car travels westward at constant speed.
- B) The car travels eastward and speeds up.
- C) The car travels westward and slows down.
- D) The car travels eastward and slows down.
- E) The car starts from rest and moves toward the east.

Ans: DDifficulty: EasySectionDef: Section 2-3

- An elevator is moving upward with a speed of 11 m/s. Three seconds later, the elevator is still moving upward, but its speed has been reduced to 5.0 m/s. What is the average acceleration of the elevator during the 3.0 s interval?
- A) 0 m/s
^{2}, upward - B) 0 m/s
^{2}, downward - C) 3 m/s
^{2}, upward - D) 3 m/s
^{2}, downward - E) 7 m/s
^{2}, downward

Ans: BDifficulty: MediumSectionDef: Section 2-3

- A landing airplane makes contact with the runway with a speed of 75.0 m/s and moves toward the south. After 18.5 seconds, the airplane comes to rest. What is the average acceleration of the airplane during the landing?
- A) 11 m/s
^{2}, north - B) 11 m/s
^{2}, south - C) 05 m/s
^{2}, north - D) 05 m/s
^{2}, south - E) 3 m/s
^{2}, north

Ans: CDifficulty: MediumSectionDef: Section 2-3

- A pitcher delivers a fast ball with a velocity of 43 m/s to the south. The batter hits the ball and gives it a velocity of 51 m/s to the north. What was the average acceleration of the ball during the 1.0 ms when it was in contact with the bat?
- A) 3 × 10
^{4}m/s^{2}, south - B) 1 × 10
^{4}m/s^{2}, north - C) 4 × 10
^{4}m/s^{2}, north - D) 2 × 10
^{3}m/s^{2}, south - E) 0 × 10
^{3}m/s^{2}, north

Ans: CDifficulty: HardSectionDef: Section 2-3

- A car is moving at a constant velocity when it is involved in a collision. The car comes to rest after 0.450 s with an average acceleration of 60.0 m/s
^{2}in the direction opposite that of the car’s velocity. What was the speed, in km/h, of the car before the collision? - A) 2 km/h
- B) 8 km/h
- C) 2 km/h
- D) 105 km/h
- E) 144 km/h

Ans: CDifficulty: MediumSectionDef: Section 2-3

- A train with a constant velocity of +28.6 m/s approaches a small town . The operator applies the brake, reducing the train’s velocity to +11.4 m/s. If the average acceleration of the train during braking is –1.35 m/s
^{2}, for what elapsed time does the operator apply the brake? - A) 44 s
- B) 7 s
- C) 38 s
- D) 92 s
- E) 4 s

Ans: BDifficulty: MediumSectionDef: Section 2-3

- Which one of the following is
*not*a vector quantity? - A) acceleration
- B) average speed
- C) displacement
- D) average velocity
- E) instantaneous velocity

Ans: BDifficulty: EasySectionDef: Section 2-4 and Section 2-5

- In which one of the following cases is the displacement of the object directly proportional to the elapsed time?
- A) a ball rolls with constant velocity
- B) a ball at rest is given a constant acceleration
- C) a ball rolling with velocity
**v**_{o}is given a constant acceleration - D) a bead falling through oil experiences a decreasing acceleration
- E) a rocket fired from the earth’s surface experiences an increasing acceleration

Ans: ADifficulty: EasySectionDef: Section 2-4 and Section 2-5

- Which one of the following statements must be true if the expression is to be used?
- A)
*x*is constant. - B)
*v*is constant. - C)
*t*is constant. - D)
*a*is constant. - E) Both
*v*_{0}and*t*are constant.

Ans: DDifficulty: EasySectionDef: Section 2-4 and Section 2-5

- Starting from rest, a particle confined to move along a straight line is accelerated at a rate of 5.0 m/s
^{2}. Which one of the following statements accurately describes the motion of this particle? - A) The particle travels 5.0 m during each second.
- B) The particle travels 5.0 m
*only*during the first second. - C) The speed of the particle increases by 5.0 m/s during each second.
- D) The acceleration of the particle increases by 5.0 m/s
^{2}during each second. - E) The final speed of the particle will be proportional to the distance that the particle covers.

Ans: CDifficulty: MediumSectionDef: Section 2-4 and Section 2-5

- Which one of the following situations is
*not*possible? - A) A body has zero velocity and non-zero acceleration.
- B) A body travels with a northward velocity and a northward acceleration.
- C) A body travels with a northward velocity and a southward acceleration.
- D) A body travels with a constant velocity and a time-varying acceleration.
- E) A body travels with a constant acceleration and a time-varying velocity.

Ans: DDifficulty: MediumSectionDef: Section 2-4 and Section 2-5

- A truck accelerates from rest at point
**A**with constant acceleration of magnitude*a*and, subsequently, passes points**B**and**C**as shown in the figure.

The distance between points **B** and **C** is *x*, and the time required for the truck to travel from **B** to **C** is *t*. Which expression determines the *average speed* of the truck between the points **B** and **C**?

- A)
*v*^{2}= 2*ax* - B)
- C)
*v*=*xt* - D)
- E)
*v*=*at*

Ans: BDifficulty: EasySectionDef: Section 2-4 and Section 2-5

- Two objects A and B accelerate from rest with the same constant acceleration. Object A accelerates

for twice as much time as object B, however. Which one of the following statements is true concerning these objects at the end of their respective periods of acceleration?

- A) Object A will travel twice as far as object B.
- B) Object A will travel four times as far as object B.
- C) Object A will travel eight times further than object B.
- D) Object A will be moving four times faster than object B.
- E) Object A will be moving eight times faster than object B.

Ans: BDifficulty: MediumSectionDef: Section 2-4 and Section 2-5

- Two cars travel along a level highway. It is observed that the distance between the cars is
*increasing*. Which one of the following statements concerning this situation is*necessarily*true? - A) The velocity of each car is increasing.
- B) At least one of the cars has a
*non-zero* - C) The leading car has the greater acceleration.
- D) The trailing car has the smaller acceleration.
- E) Both cars could be accelerating at the same rate.

Ans: EDifficulty: HardSectionDef: Section 2-4 and Section 2-5

- A car, starting from rest, accelerates in a straight-line path at a constant rate of 2.0 m/s
^{2}.

How far will the car travel in 12 seconds?

- A) 180 m
- B) 144 m
- C) 6 m
- D) 24 m
- E) 288 m

Ans: BDifficulty: EasySectionDef: Section 2-4 and Section 2-5

- An object moving along a straight line is decelerating. Which one of the following statements concerning the object’s acceleration is
*necessarily*true? - A) The value of the acceleration is positive.
- B) The direction of the acceleration is in the same direction as the displacement.
- C) An object that is decelerating has a negative acceleration.
- D) The direction of the acceleration is in the direction opposite to that of the velocity.
- E) The acceleration changes as the object moves along the line.

Ans: DDifficulty: MediumSectionDef: Section 2-4 and Section 2-5

- A car starts from rest and accelerates at a constant rate in a straight line. In the
*first*second the car moves a distance of 2.0 meters. How fast will the car be moving at the end of the*second*second? - A) 0 m/s
- B) 16 m/s
- C) 0 m/s
- D) 32 m/s
- E) 0 m/s

Ans: EDifficulty: HardSectionDef: Section 2-4 and Section 2-5

- A car starts from rest and accelerates at a constant rate in a straight line. In the
*first*second the car moves a distance of 2.0 meters. How much*additional*distance will the car move during the*second*second of its motion? - A) 0 m
- B) 0 m
- C) 0 m
- D) 0 m
- E) 13 m

Ans: CDifficulty: HardSectionDef: Section 2-4 and Section 2-5

- A car is initially traveling at 50.0 km/h. The brakes are applied and the car stops over a distance of 35 m. What was magnitude of the car’s acceleration while it was braking?
- A) 8 m/s
^{2} - B) 4 m/s
^{2} - C) 36 m/s
^{2} - D) 71 m/s
^{2} - E) 8 m/s
^{2}

Ans: ADifficulty: HardSectionDef: Section 2-4 and Section 2-5

- The minimum takeoff speed for a certain airplane is 75 m/s. What minimum acceleration is required if the plane must leave a runway of length 1050 m? Assume the plane starts from rest at one end of the runway.
- A) 5 m/s
^{2} - B) 0 m/s
^{2} - C) 5 m/s
^{2} - D) 0 m/s
^{2} - E) 7 m/s
^{2}

Ans: EDifficulty: MediumSectionDef: Section 2-4 and Section 2-5

- A car traveling along a road begins accelerating with a constant acceleration of 1.5 m/s
^{2}in the direction of motion. After traveling 392 m at this acceleration, its speed is 35 m/s. Determine the speed of the car when it began accelerating. - A) 5 m/s
- B) 0 m/s
- C) 34 m/s
- D) 49 m/s
- E) 3 m/s

Ans: BDifficulty: MediumSectionDef: Section 2-4 and Section 2-5

- A train with a constant speed of 16 m/s passes through a town. After leaving the town, the train accelerates at 0.33 m/s
^{2}until it reaches a speed of 35 m/s. How far did the train travel while it was accelerating? - A) 029 km
- B) 53 km
- C) 5 km
- D) 3 km
- E) 0 km

Ans: CDifficulty: MediumSectionDef: Section 2-4 and Section 2-5

- A cheetah is walking at a speed of 1.15 m/s when it observes a gazelle 43.0 m directly ahead. If the cheetah accelerates at 9.25 m/s
^{2}, how long does it take the cheetah to reach the gazelle if the gazelle doesn’t move? - A) 29 s
- B) 67 s
- C) 05 s
- D) 94 s
- E) 93 s

Ans: EDifficulty: HardSectionDef: Section 2-4 and Section 2-5

- A body initially at rest is accelerated at a constant rate for 5.0 seconds in the positive
*x*direction. If the final speed of the body is 20.0 m/s, what was the body’s acceleration? - A) 25 m/s
^{2} - B) 0 m/s
^{2} - C) 0 m/s
^{2} - D) 8 m/s
^{2} - E) 6 m/s
^{2}

Ans: CDifficulty: EasySectionDef: Section 2-4 and Section 2-5

- A race car has a speed of 80 m/s when the driver releases a drag parachute. If the parachute causes a deceleration of –4 m/s
^{2}, how far will the car travel before it stops? - A) 20 m
- B) 200 m
- C) 400 m
- D) 800 m
- E) 1000 m

Ans: DDifficulty: MediumSectionDef: Section 2-4 and Section 2-5

- A car is stopped at a red traffic light. When the light turns to green, the car has a constant acceleration and crosses the 9.10-m intersection in 2.86 s. What is the magnitude of the car’s acceleration?
- A) 77 m/s
^{2} - B) 98 m/s
^{2} - C) 23 m/s
^{2} - D) 36 m/s
^{2} - E) 80 m/s
^{2}

Ans: CDifficulty: MediumSectionDef: Section 2-4 and Section 2-5 Reference: Ref 2-3 An object starts from rest and accelerates uniformly in a straight line in the positive *x* direction.After 11 seconds, its speed is 70.0 m/s.

- Determine the acceleration of the object.
- A) +3.5 m/s
^{2} - B) +6.4 m/s
^{2} - C) –3.5 m/s
^{2} - D) –6.4 m/s
^{2} - E) +7.7 m/s
^{2}

Ans: BRefer To: Ref 2-3Difficulty: MediumSectionDef: Section 2-4 and Section 2-5

- How far does the object travel during the first 11 seconds?
- A) 35 m
- B) 77 m
- C) 390 m
- D) 590 m
- E) 770 m

Ans: CRefer To: Ref 2-3Difficulty: MediumSectionDef: Section 2-4 and Section 2-5

- What is the
*average velocity*of the object during the first 11 seconds? - A) +3.6 m/s
- B) +6.4 m/s
- C) +35 m/s
- D) +72 m/s
- E) –140 m/s

Ans: CRefer To: Ref 2-3Difficulty: MediumSectionDef: Section 2-4 and Section 2-5

- Ball A is dropped from rest from a window. At the same instant, ball B is thrown downward; and ball C is thrown upward from the same window. Which statement concerning the balls after their release is necessarily true if air resistance is neglected?
- A) At some instant after it is thrown, the acceleration of ball C is zero.
- B) All three balls strike the ground at the same time.
- C) All three balls have the same velocity at any instant.
- D) All three balls have the same acceleration at any instant.
- E) All three balls reach the ground with the same velocity.

Ans: DDifficulty: MediumSectionDef: Section 2-6

- A ball is thrown vertically upward from the surface of the earth. Consider the following quantities:

**(1) the speed of the ball; (2) the velocity of the ball; (3) the acceleration of the ball.**Which of these is (are) zero when the ball has reached the maximum height?

- A) 1 and 2 only
- B) 1 and 3 only
- C) 1 only
- D) 2 only
- E) 1, 2, and 3

Ans: ADifficulty: EasySectionDef: Section 2-6