Physics Final

81. An 1876 N crate is being pushed across a level force at a constant speed by a force of 747 N at an angle of 57o above the horizontal. What is the coefficient of kinetic friction?

.178

78. Venus rotates slowly about its axis, the period being 243 days. The mass of Venus is 4.87 x 1024 kg. Determine the radius for a synchronous satellite in orbit around Venus. (Assume circular orbit)

1.54*10^9

62. A 15kg box is being pulled across the table to the right at a constant speed with a force of 147 N. what is the force of friction? a. 2205 N b. 225 N c. 147 N d. 1 N

147

126. A projectile is fired horizontally from a height of 20 meters above the ground, with an initial velocity of 7.0 m/s. How far does the projectile travel horizontally before it reaches the ground a. 14m b. 140m c. 3.5m d. 7m e. 20m

A. 14m

119. When one light bulb in parallel circuit containing several light bulbs burns out, the other light bulbs ________. A. Burn the same as before. B. Do not burn at all. C. Burn with twice the brightness. D. None of the above

A. Burn the same as before.

20. A race car can be slowed with a constant acceleration of -11 m/s2. If the car is going 55m/s, how many meters will it travel before it stops? a. 5 m b. 140 m c. 275 m d. None of the above 137.5?

B. 140 m or 137.5 m

118. Three bulbs are connected in series to a 4.5 V battery. The second bulb burns out. The voltage reading on the first bulb is _______. A. 4.5 V B. 2.25 V C. 0 V D. none of the above

C. 0 V

Emily's vacuum cleaner has a power rating of 250 watts. If the vacuum cleaner does 3.6 x 106 joules of work, how long (in hours) did Emily spend vacuuming? a. 6.9 x 10^-5 hrs. b. 6.9 hrs. c. 14,400 hrs. d. 4 hrs.

D. 4 hrs.

133. A disk with radius=R, mass=M, and moment of inertia=0.5MR2 rolls down a frictionless surface at a constant velocity v. What is the angular momentum of the disc about its own axis as it roles? a. MRv/2 b. MRv c. Mv d. 2MRv

N/A

30. In a velocity-time graph the area under the line indicates a. displacement b. velocity c. acceleration d. time e. None of the above

a. displacement

83. The number of waves in a given time frame is called a. amplitude b. period c. frequency d. wavelength

c. frequency

114. Converts mechanical energy into electrical energy a. transformers b. magnetic fields c. generator d. motors

c. generator

17. If an object in motion increases their speed the acceleration would a. remain the same b. decrease c. increase d. equal zero

c. increase

66. Whenever one object exerts a force on a second object, there is an equal and opposite force exerted on the first object. The preceding statement best describes a. newton's first law b. newton's second law c. newton's third law d. law of forces

c. newton's third law

89. When a wave bends due to a change in speed as it passes between two different mediums a. diffraction b. reflection c. refraction d. polarization

c. refraction

111. Measures how easily charges flow in a material a. transformer b. decibel c. resistance d. current

c. resistance

You have an 8kg bowling ball in your shelf at a height of 1.5 meters. What is its momentum? a. 5.3 b. 0.1875 c. 12 d. 0

d. 0

12. One can change the acceleration of a moving object by a. maintaining a constant speed b. increasing the distance traveled c. maintaining a constant velocity d. changing direction of movement while maintaining a constant speed

d. changing direction of movement while maintaining a constant speed

109. Objects that possess loosely bound electrons and allow current to pass a. insulator b. semiconductors c. induction d. conductors

d. conductors

103. What is the frequency of a wavelength of 450nm? e. 666,666 Hz f. 1.35 x 1011 Hz g. 6.6 x 1014 Hz h. 2.98 x 10-31 Hz

e. 666,666 Hz

104. Which of the following statement is true? I. The higher the frequency the higher the wavelength II. The lower the frequency the higher the wavelength III. The higher the energy the higher the wavelength IV. The higher the energy the lower the frequency a. I and IV b. I and III c. II only d. II and III e. None of the above

e. None of the above

73. The acceleration due to gravity on earth equals a. zero b. depends on the mass of the object c. 9.8 m/s^2 d. The same as the force of the object

c. 9.8 m/s^2

128. In which of the scenarios will waves travel faster through the string: a. A hanging string with no weight attached b. 5N weight being suspended from a string c. A 10N weight being suspend from a string d. None of the above

c. A 10N weight being suspend from a string

56. Which of the following is true a. A force can only exist through physical contact b. A force cannot exist without physical contact c. A force can exist without physical contact d. None of the above

c. A force can exist without physical contact

68. A force can change the motion of an object that is already moving by a. accelerating the moving object b. changing its direction c. Both A and B d. None of the above

c. Both A and B

107. Flow of electrical energy or charge a. electrical potential b. induction c. Electrical current d. static electricity

c. Electrical current

70. Kinetic friction can be defined as a. Friction that acts during circular motion b. Friction that keeps an object at rest and prevents it from moving c. Friction that acts during motion d. Friction that acts against an electrical current

c. Friction that acts during motion

99. Beats are produced when two tuning forks____________. a. Are sounded together b. Have the same frequency and are sounded together c. Have almost the same frequency and are sounded together d. Produce the Doppler effect

c. Have almost the same frequency and are sounded together

94. What are the different types of mechanical waves? a. Sound waves and electromagnetic waves b. Longitudinal waves and electromagnetic waves c. Longitudinal waves and transverse waves d. Both a and c

c. Longitudinal waves and transverse waves

127. A car is approaching you and honks at you because you are standing in the middle of the road. After the car passes you, the sound of its horn can still be heard. The frequency of the car will be _____________ after the car passed you. a. The same b. Equal to the fundamental frequency c. Lower d. Higher

c. Lower

40. In an inelastic collision a. Objects collide without being permanently deformed b. Objects collide without generating heat c. Objects collide and become distorted in the process d. Both a and b

c. Objects collide and become distorted in the process

3. Acceleration is defined as a. The difference of distance between the starting point and the final point b. The change of distance over time c. The rate at which velocity changes d. The change of total distance in a given amount of time

c. The rate at which velocity changes

21. If the acceleration is in the same direction as the velocity then a. The speed decreases and the acceleration is negative b. The speed increases and the acceleration is negative c. The speed increases and the acceleration is positive d. The speed decreases and the acceleration is positive

c. The speed increases and the acceleration is positive

57. A (n) ____ is a push or a pull a. Newton b. Acceleration c. force d. inertia

c. force

39. A 1000-watt microwave oven takes 120 seconds to heat a bowl of soup. How many joules of energy does it use? a. 8.3 J b. 0.120 J c. 1200 J d. 1.2 x 10^5 J

d. 1.2 x 10^5 J

36. A 525 N gymnast jumps upward a distance of 0.50 m to reach the uneven parallel bars. How much work did she do before she even began her routine? a. 525 J b. 0 J c. 1050 J d. 263 J

d. 263 J

28. A boat moves with a velocity of 35 m/s north on the Mississippi river which flows with a velocity of 16 m/s east. Calculate the velocity with respect to due north. a. 28.10 b. 35m/s c. 38.5m/s at 7.978 degrees east of north d. 38.5m/s at 25 degrees east of north e. None of the above

d. 38.5m/s at 25 degrees east of north

29. A football is thrown 30 m due east, then the winds shift its trajectory at 55 degrees south of east for 20 m. calculate the football's resultant displacement. a. 28.6 m b. 36.1 m at 35 degrees south of east c. 36.1 m at 55 degrees south of east d. 44.6 m at 21.6 degrees south of east e. None of the above

d. 44.6 m at 21.6 degrees south of east

23. An arrow is shot at 45.0° above the horizontal. Its velocity is 43 m/s, and it hits the target. What is the maximum height the arrow will attain? a. 3 m b. 30 m c. 45 m d. 47 m

d. 47 m

53. A car takes 3.4 second to accelerate at a constant rate from rest to a speed of 27 m/s (60mph) if the mass of the vehicle is 1500kg, what is the car's kinetic energy? a. 137,700 J b. 156 J c. 20,250 J d. 5.5 x 105 J

d. 5.5 x 10^5 J

101. A photon has an energy of 3.29 x 10-25J. What is the wavelength? a. 496528825 b. 1.1 x 10^-33 c. 9.11 x 10^32 d. 6.04 x 10^-1

d. 6.04 x 10^-1

35. Recoil can be described as a. Having the same equation as an elastic collision b. The opposite of a collision c. Having a net momentum of zero d. All of the above

d. All of the above

77. Which of the following is true regarding torque? a. Torque occurs when a force is applied in a motion that is perpendicular to the distance b. Creates a rotational motion c. Is the perpendicular force applied times the lever arm d. All of the above e. None of the above

d. All of the above

19. A negative acceleration implies ____ a. The object is moving backwards b. The final velocity is smaller than the initial velocity c. The object is slowing down d. Both b and c

d. Both b and c

116. Which circuit above has the greater equivalent resistance and what is it? a. Circuit Y has 18 Ω b. Circuit X has 144 Ω c. Circuit Y has 4 Ω d. Circuit X has 12 Ω

d. Circuit X has 12 Ω

88. The change in a frequency of a wave due to the motion of the wave source or wave receiver a. decibel b. Harmonic waves c. Law of reflection d. Doppler effect

d. Doppler effect

135. Two waves with slightly different frequencies overlap creating a beat. How would you go about calculating the frequency of the beat? a. Newton's 3rd law states that the frequency of the largest wave will be adopted b. The frequency cannot be calculated c. Add the frequencies of the two ways together d. Find the difference between the two waves

d. Find the difference between the two waves

74. Angular speed can be described as a. Circular speed b. F= mv2 / r c. Gravitational circumference d. None of the above

d. None of the above

97. Which of the following is not true a. Radio waves have a lower frequency than x-rays b. Microwaves have longer wavelengths than gamma rays. c. Infrared rays have lower energy than ultraviolet rays d. None of the above

d. None of the above

15. In a distance-time graph the slope of the line represents a. acceleration b. the distance traveled c. displacement d. The average speed

d. The average speed

5. Average speed is a. The difference of distance between the starting point and the final point b. The change of distance over time c. The rate at which velocity changes d. The change of total distance in a given amount of time

d. The change of total distance in a given amount of time

65. You hit a wall with a stick. The equal but opposite reaction is a. The wall pushes against you b. The stick pushes against you c. You push against the stick d. The wall pushes against the stick

d. The wall pushes against the stick

92. A wave can be described as a. a disturbance that carries sound b. a disturbance that carries light and sound c. a pulse of matter d. a disturbance that carries energy

d. a disturbance that carries energy

41. Which of the following is true about impulse a. it is the product of the impact time and the impact force b. equals the difference of momentum c. it equals the recoil force d. both a and b

d. both a and b

86. When identical parts of a wave overlap a. amplitude b. frequency c. polarization d. constructive interference

d. constructive interference

112. The voltage of a circuit is the product of its current and resistance a. ampere b. coulomb's law c. point charges d. ohm's law

d. ohm's law

50. If the velocity of an object is decreased by half, its kinetic energy a. quadruples b. is halved c. stays the same d. reduces by three fourths e. doubles

d. reduces by three fourths

115. An electrical device that changes voltage. It can either be increased or decreased a. motors b. generator c. magnetic fields d. transformers

d. transformers

84. The distance over which a wave's shape repeats a. amplitude b. period c. frequency d. wavelength

d. wavelength

24. In a velocity-time graph what does a positive slope represents a. Object is moving at a constant speed b. Constant positive acceleration c. Object is stopped d. Constant positive velocity e. None of the above

e. None of the above

31. In a displacement-time graph the area under the line indicates a. displacement b. velocity c. acceleration d. time e. None of the above

e. None of the above

33. In an acceleration-time graph what does the slope represent? a. displacement b. velocity c. acceleration d. time e. None of the above

e. None of the above

42. How is impact force and impact time related? a. Indirectly proportional b. Directly proportional c. They are opposite to each other d. None of the above

a. Indirectly proportional

25. How would a distance-time graph look like for an object that is accelerating? a. The slope of the line would be zero b. The line would be curved c. The slope of the line would be greater than zero d. Impossible to determine

b. The line would be curved

108. The difference in charge between two points a. induction b. static electricity c. electrical potential d. Electrical current

c. electrical potential

61. A rubbing force that acts against motion between two touching surfaces is called a. Rubbing force b. Inertia c. momentum d. friction

d. friction

95. Where do rarefactions occur? a. When light is bent as it transitions between mediums b. In transverse waves c. When light is reflected d. in longitudinal waves

d. in longitudinal waves

113. Converts electrical energy into mechanical energy a. generator b. magnetic fields c. transformers d. motors

d. motors

Three blocks of masses 1.0, 2.0, and 4.0 kilograms are connected by massless strings, one of which passes over a frictionless pulley of negligible mass, as shown above. What is the tension of the string connected to the 1kg block?

11N

Masses m1 = 4.00 kg and m2 = 9.00 kg are connected by a light string that passes over a frictionless pulley. Mass 1 is held at rest on the floor and m2 rests on a fixed incline of angle 40 degrees. The masses are released from rest, and m2 slides 1.00 m down the incline in 5 seconds. Determine the tension in the string

49.4N

79. The maximum tension that a 0.80 m string can tolerate is 15 N. A 0.35-kg ball attached to this string is being whirled in a vertical circle. What is the maximum speed the ball can have at the top of the circle?

6.490

117. The equivalent resistance in Diagram A above is. a. 11 Ω b. 300 Ω c. 17 Ω d. 20 Ω

a. 11 Ω

9. What is the distance traveled of a deer that moves 5 miles north-west, then 6 miles east, then 4 miles south? a. 15 miles b. It will return to its initial location c. 3 miles d. 4 miles

a. 15 miles

34. You did 550 J of work lifting a 220 N backpack. How high did you lift the backpack? a. 2.5 m b. 25 m c. 550 m d. 0.4 m

a. 2.5 m

37. A motor does 2,000 joules of work in 90 seconds. What is the power of the motor? a. 22 W b. 0.45 W c. 1.8 x105 W d. 150 W

a. 22 W

47. A 0.5 kg baseball is dropped from rest and hits the ground at a speed of 10m/s. Calculate the gravitational potential energy of the baseball before it was dropped a. 25 J b. 6.25 J c. 5.1 J d. None of the above

a. 25 J

52. If a bullet that weight 0.025kg and has a kinetic energy of 1,800 J immediately after being fired how fast is the bullet traveling? a. 379 m/s b. 144,000 m/s c. 441 m/s d. 2025 m/s

a. 379 m/s

100. What is the energy of a photon of green light with a frequency 6.4 x 1014Hz? a. 4.24 x 10^-19 b. 4.6 x 10^-7 c. 2.13 x 10^6 d. 1.04 x 10^-48

a. 4.24 x 10-19

45. A 2.5 kg falls from a 30 meter high building, what is the potential energy of the brick? a. 735 N b. 24.5 N c. 12 N d. 118 N

a. 735 N

7. Which of the following describes a change in velocity? a. A car traveling at a constant speed in a circular path b. A car traveling at a constant speed going uphill c. An asteroid traveling at 1,200 miles per hour d. None of the above

a. A car traveling at a constant speed in a circular path

1. A scalar quantity refers to which of the following: a. A quantity that has a magnitude, but not a direction associated with it. b. A quantity that has a magnitude, and a direction associated with it c. A quantity that has a no magnitude, and no direction associated with it d. A system of objects that are not moving relative to one another

a. A quantity that has a magnitude, but not a direction associated with it

55. Circular motion can be described as a. An object rotating upon its axis b. An object moving around the circumference of a circle c. An circular object in motion d. A spherical object with a constant velocity

a. An object rotating upon its axis

49. An object's gravitational energy depends on a. Mass, acceleration and altitude b. Mass, velocity, volume c. Magical properties d. Molecules, temperature, height

a. Mass, acceleration and altitude

120.The mathematical relationship between current, voltage, and resistance is known as: a. Ohm's law. b. Kirchoff's law. c. Farday's law. d. Murphy's law.

a. Ohm's law.

98. Which of the following waves is the most different from others? a. Sound waves b. X-rays waves c. Gamma ray waves d. Ultraviolet waves

a. Sound waves

4. Displacement can be described as a. The difference of distance between the starting point and the final point b. The change of distance over time c. The rate at which velocity changes d. The change of total distance in a given amount of time

a. The difference of distance between the starting point and the final point

26. How would a speed-time graph look like for an object that is moving at a constant speed? a. The slope of the line would be zero b. The line would be curved c. The slope of the line would be greater than zero d. Impossible to determine

a. The slope of the line would be zero

22 . If the acceleration is in the opposite direction as the velocity then a. The speed decreases and the acceleration is negative b. The speed increases and the acceleration is negative c. The speed increases and the acceleration is positive d. The speed decreases and the acceleration is positive

a. The speed decreases and the acceleration is negative

59. In order to be ______ forces, their effects must cancel each other out and not cause a change in an object's motion a. balanced b. strong c. weak d. normal

a. balanced

16. If a car travels around a gentle curve on an interstate at 50km/h the velocity_____ a. changes b. does not change c. is equal to zero d. impossible to determine

a. changes

90. The spreading of a wave as it moves through an opening or around an object a. diffraction b. reflection c. refraction d. polarization

a. diffraction

129. An object following a straight line path at a constant speed has? a. has zero acceleration b. has a net force acting on it in the direction it is going c. has no forces acting on it d. must be moving in the absence of air resistance

a. has zero acceleration

72. The tendency of an object to resist change in its motion is called a. inertia b. magnetism c. static d. gravity

a. inertia

110. Object that possess tightly bound electrons and block current a. insulator b. semiconductors c. induction d. conductors

a. insulator

85. When waves arrive at the same place at the same time is called a. interference b. amplitude c. image d. polarization

a. interference

121. Converts electrical energy into mechanical energy a. motors b. magnetic fields c. generator d. transformers

a. motors

60. An object at rest will continue to be at rest until a net force acts on it describes a. newton's first law b. newton's second law c. newton's third law d. law of forces

a. newton's first law

64. Weight is defined as a. the product of the object's mass and acceleration due to gravity b. The amount of space an object occupies c. The amount of matter an object has d. The size of an object

a. the product of the object's mass and acceleration due to gravity

92. When an object allows some light to pass through and some light is absorbed, the object is a. translucent b. transparent c. opaque d. luminous

a. translucent

13. A rock is dropped from rest from the roof of a building 100m high. What is the velocity just before it hits the ground? a. 1960 m/s b. -44.3 m/s c. 9.8 m/s d. Impossible to determine

b. -44.3 m/s

105. What is the wavelength of a microwave that has a frequency of 6.79 x 109 Hz? a. 1.02 x 1043 m b. 0.044 m c. 4.5 x10-24 m d. 22.63 m

b. 0.044 m

134. A mass oscillates on a spring with an amplitude of 0.6m. What is its displacement when 60% of its energy is potential? a. 0.51m b. 0.46m c. 0.49m d. 0.56m

b. 0.46m

14. How long does it take a car from rest to cross 45 m of road after the light turns green if the acceleration of the car is a constant 25m/s2 ? a. 3.6 s b. 1.8 s c. 0.55 s d. 562.5 s

b. 1.8 s

123. The moon's gravity is 1/6 of the earth's gravity. The weight of a ball on earth would be _____ it's weight on the moon. a. 1/36 times b. 1/6 times c. Equal to d. 6 times

b. 1/6 times

132. A student tunes her guitar by striking a 110-Hz A-note on a tuning fork, and simultaneously playing the 5th string on her guitar. Listening closely, she hears the amplitude of the combined sound oscillating twice per second. Which of the following is most likely the current frequency of the 5th string on her guitar? a. 114 Hz b. 108 Hz c. 440 Hz d. 220 Hz

b. 108 Hz

10. A truck is moving up a steep hill at 30m/s when suddenly the engine stalls. The driver hits the breaks but they don't work!! The truck starts to accelerate at -3m/s2. How far does the truck move before it starts sliding back down the hill? a. 300m b. 150m c. 30m d. none of the above

b. 150m

27. A pitched ball is hit by a batter at a 35° angle and just clears the outfield fence, 100 m away. If the fence is at the same height as the pitch, find the velocity of the ball when it left the bat. Ignore air resistance. a. 122 m/s at 35 degrees b. 32 m/s at 35 degrees c. 57 m/s at 35 degrees d. Not enough information

b. 32 m/s at 35 degrees

2. A vector quantity refers to which of the following: a. A quantity that has a magnitude, but not a direction associated with it. b. A quantity that has a magnitude, and a direction associated with it c. A quantity that has a no magnitude, and no direction associated with it d. A system of objects that are not moving relative to one another

b. A quantity that has a magnitude, and a direction associated with it

46. An object in free fall experience what type of energy changes? a. All of the initial static energy transforms to mechanical energy b. All of the initial potential energy converts to kinetic energy c. All of the initial atomic energy becomes kinetic energy d. Not enough information to determine answer

b. All of the initial potential energy converts to kinetic energy

131. What part of a wave determines the energy of the wave? a. Frequency b. Amplitude c. Wavelength d. The medium it travels along

b. Amplitude

54. Which of the following conditions apply to newton's first law? a. As long as there is acceleration there is a force b. As long as the forces are balanced there is no acceleration c. In order for a force to be present you must overcome friction d. Friction is equal to the normal force times the coefficient of friction

b. As long as the forces are balanced there is no acceleration

76. Which of the following is a fictitious force a. Frictional force b. Centrifugal force c. Gravitational force d. None of the above

b. Centrifugal force

96. Which of the following is true about electromagnetic waves? a. Is made of magnetic particles b. Does not require a medium c. They require particles and molecules to move the waves d. Both a and c

b. Does not require a medium

51. What kind of energy is represented by an archer stretching a bow string? a. Kinetic b. Elastic potential c. Gravitational potential d. Static

b. Elastic potential

125. A 0.5kg cart released from rest at the top of a smooth inclined plane has gravitational potential energy of 6J relative to the base of the incline. When the cart has rolled halfway down the incline, the cart's potential energy will be: a. Equal to 6J b. Equal to 3J c. Less than 3J d. Greater than 6J

b. Equal to 3J

69. Static friction can be defined as a. Friction that acts during circular motion b. Friction that keeps an object at rest and prevents it from moving c. Friction that acts during motion d. Friction that acts against an electrical current

b. Friction that keeps an object at rest and prevents it from moving

6. The major difference between speed and velocity is a. Speed is the ratio of the distance an object moves to the amount of time it moves b. Velocity includes direction c. Speed is instantaneous d. Velocity is always a positive integer

b. Velocity includes direction

75. Which represents newton's second law a. v = d / t b. a = F / m c. F = (mv2 / r) d. F = 0

b. a = F / m

122. A satellite that is a spinning cylinder has initial rotational inertia I0 and angular velocity 0. Solar panels unfold from the satellite and are extended outward. The satellite then has rotational inertia If = aI0 and angular velocity f = b0, where a and b are constants. Which of the following is true about the constants a and b? a. a < 1 and b < 1 b. a > 1 and b < 1 c. a > 1 and b = 1 d. a = 1 and b = 1

b. a > 1 and b < 1

What are standing waves and what are their parts? a. A wave that stands ; nodes ( positions on standing waves with largest amplitudes) , antinodes ( stationary points) b. a wave that appears to stay in one place ; nodes (stationary points ), antinodes ( positions on standing waves with largest amplitudes) c. a wave that stands ; nodes and antinodes d. a wave that appears to stay in one place

b. a wave that appears to stay in one place ; nodes (stationary points ), antinodes ( positions on standing waves with largest amplitudes)

18. A steady change in velocity can be described as a. constant speed b. constant acceleration c. A change in direction d. Increased acceleration

b. constant acceleration

67. If a net force acts at an angle to the direction an object is moving, the object will follow a (n) ___________ path a. straight b. curved c. straight upward d. straight downward

b. curved

87. When opposite parts of a wave overlap a. superposition b. destructive interference c. amplitude d. frequency

b. destructive interference

63. In order to know how a force will affect an object, you must know the a. normalcy (normal Force) b. direction c. weight d. gravity

b. direction

11. A length of a path between two points is a description of a. displacement b. distance c. speed d. direction

b. distance

102. If the frequency of an object increases from 100 Hz to 200 Hz, its wavelength _______. a. Doubles b. halves c. is quartered d. stays the same

b. halves

44. The energy of motion is called a. static b. kinetic c. potential d. thermal

b. kinetic

58. A _____ force is the total force felt by an object a. Sum b. net c. Strong d. Balanced (equilibrium)

b. net

93. Compared to the speed of light, sound travels a. faster b. slower c. about the same d. exactly the same

b. slower

106. A buildup of non-moving electrical charge is a. induction b. static electricity c. Electrical current d. electrical potential difference

b. static electricity

91. When an object allows all light to pass through, the object is a. translucent b. transparent c. opaque d. luminous

b. transparent

61. Tangential velocity can be described as e. v = d/t a. v ½ at2 b. v = 2πr / T c. v = √ (m/r)

b. v = 2πr / T

32. In an acceleration-time graph the area under the line indicates a. displacement b. velocity c. acceleration d. time e. None of the above

b. velocity

8. What is the displacement of a deer that travels 5 miles north-west, then 6 miles east, then 4 miles south? a. 15 miles south b. It will return to its initial location c. 3 miles east d. 4 miles south

c. 3 miles east

71. As a 10,000 kg roller-coaster car starts down a slope its speed is 5m/s but 5 second later its speed is 30m/s. what is its force? a. 50 N b. 300,000 N c. 50,000 N d. 500 N

c. 50,000 N

48. A 2 kg football is thrown at 25 meters per second. What is the kinetic energy of the football? a. 312.5 J b. 490 J c. 625 J d. 50 J

c. 625 J

130. A 1-m-long pipe is closed at one end. The speed of sound in the pipe is 300 m/s. Which of the following frequencies will resonate in the pipe? a. 75 Hz & 245 Hz b. 75 Hz & 150 Hz c. 75 Hz & 225 Hz d. 75 Hz & 300 Hz

c. 75 Hz & 225 Hz