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1.
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MRI machines use
magnetic fields from powerful electromagnets to create images of the inside of a person’s body
(see diagram below).
Magnetic Resonance Imaging (MRI) | | | (Multi-Select
Question) How are the electromagnets in a MRI machine similar to all other
electromagnets, and how could a doctor increase a MRI machines’ magnetic field
(Select two
choices).
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2.
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Free-body diagrams show the magnitude and direction of all forces acting on an
object. Multi-Select QuestionSelect
the answer choices below that describe the motion of the object represented in the Free Body
Diagram above (Select 2 choices).
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3.
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Non-contact forces can
be either attractive or repulsive.
Picture 01 | Picture 02 | Picture 03 | Picture 04 | | | | | | | | | A student was asked to demonstrate that
fields exist between objects exerting forces on each other even though the objects are not in
contact. The results of this demonstration are shown above. (Multi-Select Question) Select two pictures that show repulsion, and determine which kind of
non-contact force these pictures are displaying. (Select two choices).
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4.
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Examine the sine pattern diagram shown below. (Multi-Select Question) Select
three choices that correctly match the letters shown in the diagram above?
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5.
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Stnd 04: 2nd Law of MotionOn Earth an astronaut weighs 980 Newtons
(about 220 pounds) and has a mass of 100 kilograms. On the Moon, the same astronaut weighs 162.2
Newtons (about 37 pounds). (Multi-Select Question) What is the mass of this astronaut on the
Moon, and what is the acceleration acting on the astronaut’s body when she is standing on the
Earth? (select 2 choices)
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6.
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To play high pitch notes on a guitar, a musician must decrease the length of the
strings by pressing down on the strings with his or her fingers as they are being plucked or
strummed. Now imagine that a guitar string is cut into
four pieces of different lengths as shown below. Each piece is stretched between two supports
to the same tightness. If each piece was plucked in the middle with the exact same amount of
force, which of the pieces would have the highest number of wave oscillations during one
second?
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7.
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A man is pushing a wheelbarrow full of dirt as he works on a project in his back
yard. Compared to the magnitude of the force exerted on the wheelbarrow by
the man, the magnitude of the force exerted on the man by the wheelbarrow is...?
a. | somewhat smaller | c. | the same | b. | zero | d. | larger |
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8.
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Both dogs in the picture below have the same mass, and they both are exerting
the same amount of force on the rope toy, What is most likely to happen
when the rope toy breaks in the middle as a result of the forces the dogs are exerting?
a. | As the two dogs are the same mass, neither dog will be thrown
backwards. | b. | One dog will be thrown backwards while the other dog will be able to move
forwards. | c. | The breaking of the rope toy will create unbalanced forces that only affect one of
the dogs, causing one dog to be thrown backwards. | d. | The dogs will be thrown backwards, in opposite
directions from each other, the same distance. |
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9.
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A car traveling to the West begins to slow down as it approaches a traffic
light.
Which statement concerning the motion of the car is
correct?
a. | The acceleration of the car is negative, but the velocity is
positive. | b. | The car’s acceleration is positive. but the velocity is
negative | c. | The car’s acceleration is positive. The cars velocity is also
positive. | d. | The car’s acceleration is negative. The car’s velocity is also
negative. |
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10.
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An air traffic controller monitoring radar signals determines that an aircraft
is flying at the wrong altitude. She communicates with the airplane’s pilot via radio to alert
them about this. Which two
kinds of waves was the air traffic controller using, and what kind of waves are they?
a. | Microwaves and Radio waves. Both of these are electromagnetic
waves. | b. | Microwaves and Visible Light waves. Both of these are electromagnetic
waves. | c. | Radar waves and Radio. Radar is mechanical. Radio waves are
electromagnetic. | d. | Microwaves and Gamma Rays. Microwaves and gamma waves are
mechanical. |
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11.
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SEP: Use mathematics and computational thinking (compute wavelength) The speed of a wave is 26 m/s,
and the frequency of this 12 Hz. What is the wavelength? (round to the nearest
hundredth)
a. | wavelength is 2.17 m. | c. | wavelength is 1.94 Hz | b. | wavelength is .461
m. | d. | wavelength is 312
m. |
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12.
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Two students decided to use their knowledge about
non-contact forces to build a hoverboard park. They embedded thousands of bar magnets into the
surface of the floor with the north poles facing up.
Hoverboard Skatepark | t | | What would the
polarity of the bottom of the hoverboard have to be in order to overcome the non-contact force of
gravity (to levitate the board), and what kind of non-contact force would this
demonstrate?
a. | ---Hoverboards would not have any polarity since they
are made of aluminum. ---This would demonstrate nuclear
forces. | b. | ---Instead of magnets, they could simply mount wheels on
the board. ---This would demonstrate electrostatic
force. | c. | ---The bottom of the hoverboard would have to be a north
pole. ---This would demonstrate
magnetism. | d. | ---The bottom of
the hoverboard would have to be a south pole. ---This would
demonstrate gravity. |
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13.
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The first satellite was launched into orbit in 1957. Today there are over 2000
satellites in orbit. .
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Question Part One: Which non-contact force
keeps these satellites from being flung out into space as they orbit planet Earth? Part Two:
Is this non-contact force attractive of repulsive?
a. | Part One: Magnetism is the non-contact forces
that keeps satellites in orbit. Part Two: Magnetism is a repulsive (pushing) force.
| b. | Part One: Electrostatic forces keeps satellites
in orbit around our planet.. Part Two: These forces are always attractive (pulling force).
| c. | Part One: Gravity is the non-contact forces that
keeps satellites in orbit. Part Two: Gravity is an attractive (pulling) force.
| d. | Part One: Gravity is the non-contact forces that
keeps satellites in orbit. Part Two: Gravity is a repulsive (pushing) force.
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14.
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A small car and big truck are driving down a two-lane highway on a rainy day.
The car is in the left lane, and the truck is in the right lane. Both vehicles are traveling North at
the same speed (70 MPH). Both drivers see a traffic jam up ahead, and they both slam on theirs brakes
with all of their might at the same moment. The car comes to a halt after traveling 30 feet. The
truck, however, does not halt until 120 feet. Why does it take the truck longer to come to a
complete stop even though both vehicles were moving at the same speed?
a. | Because vector quantities and scalar quantities are not the same
thing | b. | Because both cars were maintaining the same constant velocity. | c. | The mass of the car
is much greater than the mass of the truck. | d. | The mass of the truck is much greater than the
mass of the car. |
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15.
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Fiber optic cables have greatly improved communication systems by increasing the
bandwidth for data/images to be transmitted. Which kinds of waves
are used with fiber optic cables, and how fast can waves propagate through these cables?
a. | They use visible light waves that move at the speed of light. | b. | Fiber optic cables
use infrared waves at the speed of light. | c. | They use a combination of radio waves and sound
waves at the speed of sound. | d. | They use ultraviolet waves that move at the
speed of light. |
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16.
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Examine the two models of electromagnets shown
below.
A group of students constructed a model of an electromagnet which
was able to lift two paper clips (see Model W above).
1) Ask Questions: How does electricity moving through the wire
convert the nail into a temporary magnet? | 2) Define Problems: Model W can only lift two paper
clips. What change would enbable it to lift more paper clips? | |
a. | 1) Electrical current forms a magnetic field which
realigns the atoms in the nail. 2) One solution is to add more
coils to the iron core (see Model X above). | b. | 1) The
electrostatic force is reflected through the wire causing diffusion of energy. 2) One solution to this problem is to move the batteries further away from the
nail. | c. | 1) A non-contact force (nuclear strong force) forms a
magnetic field in the nail. 2) To solve this problem, they
could use a plastic or glass core (see Model X). | d. | 1) A non-contact force (gravitational attraction) realigns the atoms in the
nail. 2) One solution to this problem is to add more batteries
to the model. |
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17.
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In 1969 astronauts first traveled to the Moon in the Saturn-5/Apollo spacecraft.
Lunar Module | Saturn V-Apollo
Spacecraft | Command Module | | | | | | |
This rocket ship blasted off from the launch pad
in Florida and was propelled with ever increasing speed upwards through the Earth’s atmosphere
flying towards the Moon. Which one of the following graphs best represent the motion of
this rocket ship after it blasted off from the launch pad?
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18.
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The acceleration due to gravity on Earth is 9.8 m,/s2. The force
acting on an object on Earth is 22 Newtons. What is the mass of this object on
Earth?
a. | The mass is .445 kilograms | b. | The object’s mass is 215.6
kilograms | c. | Mass of the object is 2.24 kilograms | d. | Mass of the object is 2.6
kilograms |
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19.
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Design Task-Using 50 centimeters of copper
wire, a bar magnet, and an amperage gauge, construct a device that will induce electrical current
(build an electrical generator).
Which one of these models successfully
accomplished the design task, and what is wrong about the other three models?
a. | Model Beta is an electrical generator. The other models merely show
magnets. | b. | Model Alpha is demonstrating magnetic attraction. All other models display
repulsion. | c. | Model Delta is inducing electricity. The other models merely show magnetic
fields. | d. | Model Beta is an electromagnet. All other models merely show magnetic
fields. |
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20.
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The magnitude of the force that a baseball bat exerts on a ball is 50
Newtons The magnitude of the force that the ball
exerts on the bat is...?
a. | 10 N | b. | 50 N | c. | 250 N | d. | 5.0 N |
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21.
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Newton’s 2nd Law of Motion states that force is equal to mass times
acceleration. If the force acting on the object stays the same but the mass increases, what is
most likely to happen to the acceleration of the object?
a. | Acceleration will decrease | b. | Velocity will change but the speed and
direction will remain constant. | c. | Acceleration will increase | d. | Acceleration will
stay the same |
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22.
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A ray of light shines through a transparent window. Next it shines through a
transparent glass cup containing water and a straw in it. You notice that the straw in the water
appears to be misshaped. The light shining through the glass next impacts a mirror on the far side of
the room. Diagram 01 | Diagram 02 | Diagram 03 | Diagram 04 | | | | | | | | | Two-Part Question Part One: Place the diagrams
in the correct sequence to match the provided narrative above. Part Two: Identify the type
of wave: Mechanical or Electromagnetic?
a. | Part One: Diagram 01, Diagram 02, Diagram 03 Part Two: Visible light is an
electromagnetic wave | b. | Part One: Diagram 03, Diagram 04, Diagram
02 Part Two: Visible light is an electromagnetic wave | c. | Part One: Diagram
02, Diagram 04, Diagram 03 Part Two: Visible light is a mechanical wave | d. | Part One: Third
Diagram, 1st Diagram, Second Diagram Part Two: Visible light is a form of solar
radiation |
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23.
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Examine the apparatus shown in the illustration
containing two circular magnets. Notice that magnet A is levitating above magnet B due to a
non-contact force.
Illustration
A |
t | | Which of the
following statements correctly describes what is happening in this diagram?
a. | The polarity of the top of magnet B is the opposite
polarity of the bottom of magnet A. This is showing wave refraction (waves
bending). | b. | The bottom of magnet A is a north pole, and the bottom
of magnet B is also a north pole. This is showing magnetic attraction (opposites
attract). | c. | The top of magnet B is positively charged, and the
bottom of magnet A is also positively charged. This is showing electrostatic repulsion (opposites
attract). | d. | The polarity at the top of magnet B is the same as the
polarity at the bottom of magnet A. This is showing magnetic repulsion (like
repels). |
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24.
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You are using a telescope to look up into the night sky, and you observe a
blinking light from a satellite in orbit around the Earth. What logical
conclusion can you make about the properties of light from this observation?
a. | Light can travel through a vacuum. It can also travel through a
gas. | b. | Light travels at 186, 000 miles per second. It can travel through some
mediums. | c. | Light cannot travel through vacuums, but it can travel through solids, liquids, and
gases | d. | Light can travel through a vacuum. It can also travel through any
medium. |
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25.
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The diagram below shows a 5.00 kg block at rest on a horizontal, frictionless
table. Gravity is acting on this block, and the acceleration of gravity on Earth is 9.807
m/s 2. Which of the following diagrams
best represents the force exerted on the block by the table?
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26.
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A team of four students were asked to create a
model of an electrical generator. Each team member created one model displaying electromagnetic
phenomenon (see pictures below). Select the
model shown below that is demonstrating electricity being induced.
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27.
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A basketball player shoots a free-throw. The motion of the basketball is shown
below. Describe the motion of the basketball after
it leaves the player’s hands, and explain how this is an example of acceleration.
a. | The ball travels in a horizontal line to the basket with increasing speed. This is
acceleration because of the change in velocity. | b. | The ball travels in a curved trajectory in two
directions with decreasing speed. This is acceleration because of the change in direction.
| c. | The ball travels in curved trajectory in a single direction with decreasing speed.
This is acceleration because of the change in velocity. | d. | The ball moves
downwards and then upwards in an arc. This is acceleration because of the change in force pulling the
ball downwards. |
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28.
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If you press down on a piano key, let's say middle C, it generates a sound
wave. Now, imagine that you press it down much harder so that it still plays the same tone but more
loudly. How would pressing the key down harder
change the sound wave produced?
a. | The sound wave's amplitude would be larger. | b. | The sound
wave's wavelength would increase. | c. | The sound wave's energy would
decrease. | d. | The sound wave's frequency would increase. |
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