PSC 1121 Final Exam Review- Polk

liquid density.

31. A hydrometer is used to measure

Mass

32. Which of the following is not a derived quantity?

Seven

33. The International System of Units (SI) has ______ base units.

is a combination of units.

34. A derived unit

a mass unit.

35. A metric ton (or tonne) is

All of these

36. Which of the following quantities expressed in derived units includes the unit of length?

mass per unit volume.

37. Density describes

equivalence statement.

38. A relationship such as 1 in. = 2.54 cm is a(n)

significant figures.

39. A method of expressing the accuracy of measured quantities is

Biology

4. Which of the following is not considered a major physical science?

2.54 mg.

40. A measurement of 0.00254 g is the same as

Algebra

41. Which one of the following is not an area of physics?

A change in position

42. Motion necessarily involves

less than or equal to

43. The magnitude of a displacement is __ the magnitude of the distance traveled.

Velocity

44. Displacement divided by time gives

Speed

45. Distance covered per unit of time is called

Displacement.

46. The straight-line distance and direction between two points are, together, called

Instantaneous speed

47. A speedometer indicates _____ if the automobile is traveling forward.

All of these

48. If an object moves with constant velocity,

Velocity

49. If the instantaneous velocity of an object is constant, then so is its

"knowledge."

5. The word science comes from the Latin word meaning

Acceleration

50. The rate at which an object's velocity changes with time is called its

Steering wheel.

51. An automobile's acceleration may be changed by using the

turn signal.

52. An automobile's acceleration cannot be changed by using the

all of these

53. An acceleration may result from

Free fall

54. For which of the following is the acceleration constant?

The acceleration is in the direction opposite the motion.

55. Which one of the following is true for deceleration?

directly proportional to the time.

56. The distance traveled by an automobile moving at a constant velocity is

Decreasing

57. An object that is moving in a linear path with an acceleration in the direction opposite to the motion has a(n) ___________ velocity.

remains constant.

58. As a block slides down a 30° frictionless incline, its acceleration

m/s2

59. Which of the following is a possible unit of acceleration?

sight.

6. The most information about our environment comes to us through the sense of

the object is accelerated.

60. If the magnitude of the velocity of an object increases, we may be sure that during the time of this increase,

has a uniformly increasing velocity.

61. A freely falling object

a velocity that changes 9.8 m/s each second.

62. An object in free fall has

5 s

63. An object with a mass of 6 kg is dropped and takes 5 s to hit the ground. Then another object with a mass of 12 kg is dropped from the same point. How long does it take to hit the ground?

zero.

64. A car is moving down a freeway in a straight line at a constant rate of 21.0 m/s for 3.0 s. Its acceleration is

the object's speed increases by 9.8 m/s each second.

65. A freely falling object has a constant acceleration of 9.8 m/s2. This means that

Changing

66. An object that is moving with an acceleration different from zero will always have a(n) ____ velocity.

the time squared.

67. The distance traveled by a dropped object in free fall is directly proportional to

Acceleration has a magnitude only.

68. Which of the following statements is not true?

speed.

69. All the following may be represented by vectors except

can be deceived.

7. Our senses may obtain less-than-accurate information concerning our physical world because they

constant speed.

70. An object in uniform circular motion has

Weight

99. Which of the following would be different for a person on the Moon rather than on Earth?

1 pound.

1. A pint of water (on Earth) is approximately

1 metric ton.

16. The mass of a cubic meter of water is

A kilometer is longer than a mile.

17. Which statement is incorrect?

hypothesis.

10. A very tentative explanation of observations of some regularity of nature is a(n)

third law.

100. "For every action there is an equal and opposite reaction" is a statement of Newton's

theory.

11. A successfully tested hypothesis may take on the status of a(n)

is used for taking accurate measurements.

12. A standard unit

second.

13. The standard unit of time is the

Weight

14. Which of the following is not a fundamental quantity?

Time

15. Which fundamental quantity does the average person measure most often every day?

Gram

18. Which of the following is not a standard metric unit?

the speed of light.

19. The standard unit of length, the meter, is now defined with reference to

1 yard

2. Historically, which measurement may have been defined as the distance from the royal nose to the thumb of the royal outstretched arm?

the cesium-133 atom.

20. The standard unit of time, the second, is now defined with reference to

centi-.

21. The metric prefix that means one-hundredth (1/100) is

milli-.

22. The metric prefix that means one-thousandth (1/1000) is

kilo-.

23. The metric prefix that means one thousand (1000) is

mega-.

24. The metric prefix that means one million (1,000,000) is

1 g.

25. A cubic centimeter of pure water at maximum density has a mass of

meter.

26. In the SI, m is the symbol for

kg/m3

27. Which of the following is a unit of mass density?

1000 g.

28. One kilogram is the same as

None of these

29. An object's weight would be different on Earth and on the Moon. Which of the following would also be different?

No, theories are strong.

3. In a debate, is the statement "It's only a theory" a valid argument point against a theory (as in "The theory of evolution is wrong because it's only a theory")?

the same mass, but different weight.

30. An object transported from Earth's surface to the surface of the Moon has

Toward the center of the circle

71. An object travels in a circle of radius 2.0 m with a constant speed of 8.0 m/s. What is the direction of its acceleration?

directly proportional to the speed squared.

72. The magnitude of the acceleration of an object moving in a circle at constant speed is

inversely proportional to the radius of the circle.

73. The magnitude of the acceleration of an object moving in a circle at constant speed is

changes at a constant rate.

74. A projectile's vertical velocity component

does not change.

75. Ideally, a projectile's horizontal velocity component

Vertical velocity

76. In projectile motion, which of the following is not constant?

25°

77. A golfer hits a ball on a level fairway at an angle of 65° relative to the horizontal, and it lands on the green. Another golfer hits a ball with the same speed but at another angle, and it lands on the green by the other ball. What was the launch angle for the second golfer?

One ball is in the air longer than the other.

78. A golfer hits a ball on a level fairway at an angle of 35° relative to the horizontal, and it lands on the green. Another golfer hits a ball with the same speed but at an angle of 55°, and it lands on the green by the other ball. Which statement is accurate for this situation?

his or her vertical velocity is quite small.

79. When running and jumping to score, a basketball player seems to "hang" in the air because

measurement.

8. A quantitative observation that is the basis of scientific investigation is a(n)

Galileo.

80. The essentials of the first law of motion were initially developed by

inertia.

81. The natural tendency of an object to remain at rest or in motion with a constant velocity is called

An unbalanced force

82. A mass is accelerated when _______ acts upon the mass.

inertia.

83. Mass is a measure of

is 0 N.

84. Two equal and opposite forces of 5.0 N act on an object. The unbalanced force on the object

zero.

85. An automobile travels due north with a constant speed of 93 km/h. All forces considered, the unbalanced force acting on the auto is

acceleration.

86. A constant net force acting on an object that is free to move will produce a constant

all of these.

87. The acceleration produced by an unbalanced force acting on an object is

exhibit a change in speed and/or direction.

88. When a net force on a moving object increases, the object will

differ in magnitude by a constant.

89. Mass and weight on Earth's surface

a fundamental relationship of nature.

9. A scientific law describes

First

90. A spacecraft in space keeps going at the same velocity, even without firing its rockets, in accordance with the ____ law of motion.

Static friction

91. When you push on a stationary object and it doesn't move, what kind of force is most likely opposing your efforts?

sliding friction is less than static friction.

92. It is generally easier to push an object once it is moving than when you are getting it started. This is because

does all of the above.

93. An automobile air bag

Mars

94. On which planet (other than Earth) have air bags been deployed?

float; less than

95. An object will _____ in a fluid if its average density is ____ the density of the fluid.

Sink; Greater than

96. An object will ____ in a fluid if its average density is ____ the density of the fluid.

Weight; fluid

97. The buoyant force of an object is equal to the _______ of the ________ it displaces.

Archimedes'

98. ________ principle explains why objects float or sink in a fluid.