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NDQ_016177
the relationship between the temperature and volume of gas is known as amontons law.
null
a. true, b. false
b
T_3948
image
textbook_images/behavior_of_gases_22547.png
FIGURE 4.14 As the temperature of a gas increases, its volume also increases.
0.337419
NDQ_016177
the relationship between the temperature and volume of gas is known as amontons law.
null
a. true, b. false
b
T_4470
image
textbook_images/gases_22861.png
FIGURE 1.2
0.308342
NDQ_016177
the relationship between the temperature and volume of gas is known as amontons law.
null
a. true, b. false
b
DQ_011492
image
abc_question_images/states_of_matter_19256.png
states_of_matter_19256.png
0.303527
NDQ_016177
the relationship between the temperature and volume of gas is known as amontons law.
null
a. true, b. false
b
DQ_011501
image
question_images/states_of_matter_7614.png
states_of_matter_7614.png
0.301524
NDQ_016177
the relationship between the temperature and volume of gas is known as amontons law.
null
a. true, b. false
b
T_3947
image
textbook_images/behavior_of_gases_22545.png
FIGURE 4.12 As the volume of a gas increases, its pressure decreases.
0.29547
NDQ_016177
the relationship between the temperature and volume of gas is known as amontons law.
null
a. true, b. false
b
T_4633
image
textbook_images/modern_periodic_table_22960.png
FIGURE 1.2
0.292982
NDQ_016177
the relationship between the temperature and volume of gas is known as amontons law.
null
a. true, b. false
b
T_3945
image
textbook_images/behavior_of_gases_22544.png
FIGURE 4.11 Earths atmosphere exerts pressure. This pressure is greatest at sea level. Can you explain why?
0.292609
NDQ_016177
the relationship between the temperature and volume of gas is known as amontons law.
null
a. true, b. false
b
T_3949
image
textbook_images/behavior_of_gases_22548.png
FIGURE 4.15 As the temperature of a gas increases, its pressure increases as well.
0.2917
NDQ_016177
the relationship between the temperature and volume of gas is known as amontons law.
null
a. true, b. false
b
T_0205
image
textbook_images/the_atmosphere_20135.png
FIGURE 15.3 This graph identifies the most common gases in air.
0.284979
NDQ_016177
the relationship between the temperature and volume of gas is known as amontons law.
null
a. true, b. false
b
T_4279
image
textbook_images/convection_22749.png
FIGURE 1.1
0.284145
NDQ_016177
the relationship between the temperature and volume of gas is known as amontons law.
null
a. true, b. false
b
T_3946
text
null
For a given amount of gas, scientists have discovered that the pressure, volume, and temperature of a gas are related in certain ways. Because these relationships always hold in nature, they are called laws. The laws are named for the scientists that discovered them.
0.787584
NDQ_016177
the relationship between the temperature and volume of gas is known as amontons law.
null
a. true, b. false
b
T_4715
text
null
Compare and contrast the basic properties of matter, such as mass and volume.
0.68879
NDQ_016177
the relationship between the temperature and volume of gas is known as amontons law.
null
a. true, b. false
b
T_3691
text
null
No doubt you already have a good idea of what temperature is. You might define it as how hot or cold something feels. In physics, temperature is defined as the average kinetic energy of the particles in an object. When particles move more quickly, temperature is higher and an object feels warmer. When particles move more slowly, temperature is lower and an object feels cooler.
0.684245
NDQ_016177
the relationship between the temperature and volume of gas is known as amontons law.
null
a. true, b. false
b
T_3939
text
null
Water vapor is an example of a gas. A gas is matter that has neither a fixed volume nor a fixed shape. Instead, a gas takes both the volume and the shape of its container. It spreads out to take up all available space. You can see an example in Figure 4.6.
0.673034
NDQ_016177
the relationship between the temperature and volume of gas is known as amontons law.
null
a. true, b. false
b
T_0205
text
null
We usually cant sense the air around us unless it is moving. But air has the same basic properties as other matter. For example, air has mass, volume and, of course, density.
0.66607
NDQ_016177
the relationship between the temperature and volume of gas is known as amontons law.
null
a. true, b. false
b
T_3941
text
null
Why do different states of matter have different properties? Its because of differences in energy at the level of atoms and molecules, the tiny particles that make up matter.
0.662246
NDQ_016177
the relationship between the temperature and volume of gas is known as amontons law.
null
a. true, b. false
b
T_3970
text
null
The number of protons per atom is always the same for a given element. However, the number of neutrons may vary, and the number of electrons can change.
0.660405
NDQ_016177
the relationship between the temperature and volume of gas is known as amontons law.
null
a. true, b. false
b
T_4823
text
null
Newtons third law of motion is just one of many scientific laws. A scientific law is a statement describing what always happens under certain conditions. Other examples of laws in physical science include: Newtons first law of motion Newtons second law of motion Newtons law of universal gravitation Law of conservation of mass Law of conservation of energy Law of conservation of momentum
0.657823
NDQ_016177
the relationship between the temperature and volume of gas is known as amontons law.
null
a. true, b. false
b
T_0966
text
null
Why is such a small amount of carbon dioxide in the atmosphere even important? Carbon dioxide is a greenhouse gas. Greenhouse gases trap heat energy that would otherwise radiate out into space, which warms Earth. These gases were discussed in the chapter Atmospheric Processes.
0.657405
NDQ_016177
the relationship between the temperature and volume of gas is known as amontons law.
null
a. true, b. false
b
T_0959
text
null
The short term cycling of carbon begins with carbon dioxide (CO2 ) in the atmosphere.
0.65671
NDQ_016179
which of the following units could be used to measure the pressure of a gas?
null
a. pounds per inch, b. Newtons per square meter, c. kilograms per square meter, d. none of the above
b
DQ_011501
image
question_images/states_of_matter_7614.png
states_of_matter_7614.png
0.31002
NDQ_016179
which of the following units could be used to measure the pressure of a gas?
null
a. pounds per inch, b. Newtons per square meter, c. kilograms per square meter, d. none of the above
b
T_0287
image
textbook_images/weather_forecasting_20178.png
FIGURE 16.23 The greater the air pressure outside the tube, the higher the mercury rises inside the tube. Mercury can rise in the tube because theres no air pressing down on it.
0.290083
NDQ_016179
which of the following units could be used to measure the pressure of a gas?
null
a. pounds per inch, b. Newtons per square meter, c. kilograms per square meter, d. none of the above
b
T_4183
image
textbook_images/buoyancy_22689.png
FIGURE 1.1
0.288395
NDQ_016179
which of the following units could be used to measure the pressure of a gas?
null
a. pounds per inch, b. Newtons per square meter, c. kilograms per square meter, d. none of the above
b
T_3624
image
textbook_images/buoyancy_of_fluids_22302.png
FIGURE 15.12 Fluid pressure exerts force on all sides of this object, but the force is greater at the bottom of the object where the fluid is deeper.
0.285338
NDQ_016179
which of the following units could be used to measure the pressure of a gas?
null
a. pounds per inch, b. Newtons per square meter, c. kilograms per square meter, d. none of the above
b
T_3947
image
textbook_images/behavior_of_gases_22545.png
FIGURE 4.12 As the volume of a gas increases, its pressure decreases.
0.283369
NDQ_016179
which of the following units could be used to measure the pressure of a gas?
null
a. pounds per inch, b. Newtons per square meter, c. kilograms per square meter, d. none of the above
b
DQ_011534
image
question_images/states_of_matter_9255.png
states_of_matter_9255.png
0.283045
NDQ_016179
which of the following units could be used to measure the pressure of a gas?
null
a. pounds per inch, b. Newtons per square meter, c. kilograms per square meter, d. none of the above
b
DQ_011497
image
question_images/states_of_matter_7613.png
states_of_matter_7613.png
0.282348
NDQ_016179
which of the following units could be used to measure the pressure of a gas?
null
a. pounds per inch, b. Newtons per square meter, c. kilograms per square meter, d. none of the above
b
DQ_010918
image
question_images/simple_machines_7559.png
simple_machines_7559.png
0.279771
NDQ_016179
which of the following units could be used to measure the pressure of a gas?
null
a. pounds per inch, b. Newtons per square meter, c. kilograms per square meter, d. none of the above
b
T_3945
image
textbook_images/behavior_of_gases_22544.png
FIGURE 4.11 Earths atmosphere exerts pressure. This pressure is greatest at sea level. Can you explain why?
0.276022
NDQ_016179
which of the following units could be used to measure the pressure of a gas?
null
a. pounds per inch, b. Newtons per square meter, c. kilograms per square meter, d. none of the above
b
DQ_011479
image
abc_question_images/states_of_matter_17613.png
states_of_matter_17613.png
0.275802
NDQ_016179
which of the following units could be used to measure the pressure of a gas?
null
a. pounds per inch, b. Newtons per square meter, c. kilograms per square meter, d. none of the above
b
T_3946
text
null
For a given amount of gas, scientists have discovered that the pressure, volume, and temperature of a gas are related in certain ways. Because these relationships always hold in nature, they are called laws. The laws are named for the scientists that discovered them.
0.732189
NDQ_016179
which of the following units could be used to measure the pressure of a gas?
null
a. pounds per inch, b. Newtons per square meter, c. kilograms per square meter, d. none of the above
b
T_3941
text
null
Why do different states of matter have different properties? Its because of differences in energy at the level of atoms and molecules, the tiny particles that make up matter.
0.687892
NDQ_016179
which of the following units could be used to measure the pressure of a gas?
null
a. pounds per inch, b. Newtons per square meter, c. kilograms per square meter, d. none of the above
b
T_3918
text
null
Some properties of matter can be measured or observed only when matter undergoes a change to become an entirely different substance. These properties are called chemical properties. They include flammability and reactivity.
0.684533
NDQ_016179
which of the following units could be used to measure the pressure of a gas?
null
a. pounds per inch, b. Newtons per square meter, c. kilograms per square meter, d. none of the above
b
T_4715
text
null
Compare and contrast the basic properties of matter, such as mass and volume.
0.682894
NDQ_016179
which of the following units could be used to measure the pressure of a gas?
null
a. pounds per inch, b. Newtons per square meter, c. kilograms per square meter, d. none of the above
b
T_0205
text
null
We usually cant sense the air around us unless it is moving. But air has the same basic properties as other matter. For example, air has mass, volume and, of course, density.
0.6683
NDQ_016179
which of the following units could be used to measure the pressure of a gas?
null
a. pounds per inch, b. Newtons per square meter, c. kilograms per square meter, d. none of the above
b
T_4421
text
null
1. What is the traditional definition of gravity? 2. Identify factors that influence the strength of gravity between two objects.
0.658502
NDQ_016179
which of the following units could be used to measure the pressure of a gas?
null
a. pounds per inch, b. Newtons per square meter, c. kilograms per square meter, d. none of the above
b
T_4239
text
null
How fast a chemical reaction occurs is called the reaction rate. Several factors affect the rate of a given chemical reaction. They include the: temperature of reactants. concentration of reactants. surface area of reactants. presence of a catalyst.
0.655463
NDQ_016179
which of the following units could be used to measure the pressure of a gas?
null
a. pounds per inch, b. Newtons per square meter, c. kilograms per square meter, d. none of the above
b
T_3960
text
null
Solids that change to gases generally first pass through the liquid state. However, sometimes solids change directly to gases and skip the liquid state. The reverse can also occur. Sometimes gases change directly to solids.
0.653864
NDQ_016179
which of the following units could be used to measure the pressure of a gas?
null
a. pounds per inch, b. Newtons per square meter, c. kilograms per square meter, d. none of the above
b
T_3939
text
null
Water vapor is an example of a gas. A gas is matter that has neither a fixed volume nor a fixed shape. Instead, a gas takes both the volume and the shape of its container. It spreads out to take up all available space. You can see an example in Figure 4.6.
0.647777
NDQ_016179
which of the following units could be used to measure the pressure of a gas?
null
a. pounds per inch, b. Newtons per square meter, c. kilograms per square meter, d. none of the above
b
T_2237
text
null
All known matter can be divided into a little more than 100 different substances called elements.
0.647769
NDQ_016180
particles of a gas have movement only when they are heated.
null
a. true, b. false
b
T_4470
image
textbook_images/gases_22861.png
FIGURE 1.2
0.32613
NDQ_016180
particles of a gas have movement only when they are heated.
null
a. true, b. false
b
DQ_011501
image
question_images/states_of_matter_7614.png
states_of_matter_7614.png
0.31339
NDQ_016180
particles of a gas have movement only when they are heated.
null
a. true, b. false
b
DQ_010978
image
question_images/convection_of_air_8045.png
convection_of_air_8045.png
0.301692
NDQ_016180
particles of a gas have movement only when they are heated.
null
a. true, b. false
b
T_3944
image
textbook_images/solids_liquids_gases_and_plasmas_22541.png
FIGURE 4.8 Kinetic energy is needed to overcome the force of attraction between particles of the same substance.
0.294593
NDQ_016180
particles of a gas have movement only when they are heated.
null
a. true, b. false
b
DQ_002681
image
question_images/radioactive_decay_7516.png
radioactive_decay_7516.png
0.290474
NDQ_016180
particles of a gas have movement only when they are heated.
null
a. true, b. false
b
T_3945
image
textbook_images/behavior_of_gases_22544.png
FIGURE 4.11 Earths atmosphere exerts pressure. This pressure is greatest at sea level. Can you explain why?
0.285795
NDQ_016180
particles of a gas have movement only when they are heated.
null
a. true, b. false
b
DQ_011545
image
question_images/states_of_matter_9258.png
states_of_matter_9258.png
0.283546
NDQ_016180
particles of a gas have movement only when they are heated.
null
a. true, b. false
b
DQ_002744
image
question_images/radioactive_decay_8182.png
radioactive_decay_8182.png
0.283512
NDQ_016180
particles of a gas have movement only when they are heated.
null
a. true, b. false
b
DQ_011671
image
question_images/state_change_7608.png
state_change_7608.png
0.280614
NDQ_016180
particles of a gas have movement only when they are heated.
null
a. true, b. false
b
T_4633
image
textbook_images/modern_periodic_table_22960.png
FIGURE 1.2
0.27896
NDQ_016180
particles of a gas have movement only when they are heated.
null
a. true, b. false
b
T_0216
text
null
Energy travels through space or material. Heat energy is transferred in three ways: radiation, conduction, and convection.
0.766714
NDQ_016180
particles of a gas have movement only when they are heated.
null
a. true, b. false
b
T_0700
text
null
Energy is the ability to do work. Fuel stores energy and can be released to do work. Heat is given off when fuel is burned.
0.744606
NDQ_016180
particles of a gas have movement only when they are heated.
null
a. true, b. false
b
T_3941
text
null
Why do different states of matter have different properties? Its because of differences in energy at the level of atoms and molecules, the tiny particles that make up matter.
0.744253
NDQ_016180
particles of a gas have movement only when they are heated.
null
a. true, b. false
b
T_4715
text
null
Compare and contrast the basic properties of matter, such as mass and volume.
0.744007
NDQ_016180
particles of a gas have movement only when they are heated.
null
a. true, b. false
b
T_3801
text
null
Although all electromagnetic waves travel at the same speed, they may differ in their wavelength and frequency.
0.740043
NDQ_016180
particles of a gas have movement only when they are heated.
null
a. true, b. false
b
T_0721
text
null
Natural gas is mostly methane.
0.729857
NDQ_016180
particles of a gas have movement only when they are heated.
null
a. true, b. false
b
T_3918
text
null
Some properties of matter can be measured or observed only when matter undergoes a change to become an entirely different substance. These properties are called chemical properties. They include flammability and reactivity.
0.727452
NDQ_016180
particles of a gas have movement only when they are heated.
null
a. true, b. false
b
T_3946
text
null
For a given amount of gas, scientists have discovered that the pressure, volume, and temperature of a gas are related in certain ways. Because these relationships always hold in nature, they are called laws. The laws are named for the scientists that discovered them.
0.724101
NDQ_016180
particles of a gas have movement only when they are heated.
null
a. true, b. false
b
T_3943
text
null
The particles that make up matter are also constantly moving. They have kinetic energy. The theory that all matter consists of constantly moving particles is called the kinetic theory of matter. You can learn more about it at the URL below.
0.722049
NDQ_016180
particles of a gas have movement only when they are heated.
null
a. true, b. false
b
T_0460
text
null
Most pollutants enter the air when fossil fuels burn. Some are released when forests burn. Others evaporate into the air.
0.721508
NDQ_016181
amontons developed his law in the
null
a. 1500s., b. 1600s., c. 1700s., d. 1800s.
b
T_4292
image
textbook_images/daltons_atomic_theory_22758.png
FIGURE 1.1
0.257974
NDQ_016181
amontons developed his law in the
null
a. 1500s., b. 1600s., c. 1700s., d. 1800s.
b
T_4912
image
textbook_images/technology_and_science_23109.png
FIGURE 1.3
0.254582
NDQ_016181
amontons developed his law in the
null
a. 1500s., b. 1600s., c. 1700s., d. 1800s.
b
T_5014
image
textbook_images/work_23180.png
FIGURE 1.1
0.250732
NDQ_016181
amontons developed his law in the
null
a. 1500s., b. 1600s., c. 1700s., d. 1800s.
b
T_3850
image
textbook_images/electric_charge_22466.png
FIGURE 23.5 Atoms are electrically neutral, but if they lose or gain electrons they become charged particles called ions.
0.248341
NDQ_016181
amontons developed his law in the
null
a. 1500s., b. 1600s., c. 1700s., d. 1800s.
b
T_4392
image
textbook_images/electron_cloud_atomic_model_22809.png
FIGURE 1.3
0.246443
NDQ_016181
amontons developed his law in the
null
a. 1500s., b. 1600s., c. 1700s., d. 1800s.
b
T_4929
image
textbook_images/transfer_of_electric_charge_23124.png
FIGURE 1.1
0.246093
NDQ_016181
amontons developed his law in the
null
a. 1500s., b. 1600s., c. 1700s., d. 1800s.
b
T_4318
image
textbook_images/discovery_of_electromagnetism_22770.png
FIGURE 1.1
0.239095
NDQ_016181
amontons developed his law in the
null
a. 1500s., b. 1600s., c. 1700s., d. 1800s.
b
T_3897
image
textbook_images/electricity_and_magnetism_22500.png
FIGURE 25.1 Hans Christian Oersted was the scientist who discovered electromag- netism.
0.239095
NDQ_016181
amontons developed his law in the
null
a. 1500s., b. 1600s., c. 1700s., d. 1800s.
b
T_3996
image
textbook_images/modern_atomic_theory_22574.png
FIGURE 5.17 This sketch represents the electron cloud model for helium. What does the electron cloud represent?
0.234645
NDQ_016181
amontons developed his law in the
null
a. 1500s., b. 1600s., c. 1700s., d. 1800s.
b
T_3595
image
textbook_images/gravity_22276.png
FIGURE 13.23 In this diagram, "v" represents the forward velocity of the moon, and "a" represents the acceleration due to gravity. The line encircling Earth shows the moons actual orbit, which results from the combination of "v" and "a."
0.231802
NDQ_016181
amontons developed his law in the
null
a. 1500s., b. 1600s., c. 1700s., d. 1800s.
b
T_4823
text
null
Newtons third law of motion is just one of many scientific laws. A scientific law is a statement describing what always happens under certain conditions. Other examples of laws in physical science include: Newtons first law of motion Newtons second law of motion Newtons law of universal gravitation Law of conservation of mass Law of conservation of energy Law of conservation of momentum
0.603337
NDQ_016181
amontons developed his law in the
null
a. 1500s., b. 1600s., c. 1700s., d. 1800s.
b
T_0698
text
null
Energy changes form when something happens. But the total amount of energy always stays the same. The Law of Conservation of Energy says that energy cannot be created or destroyed. Scientists observed that energy could change from one form to another. They also observed that the overall amount of energy did not change.
0.520316
NDQ_016181
amontons developed his law in the
null
a. 1500s., b. 1600s., c. 1700s., d. 1800s.
b
T_3801
text
null
Although all electromagnetic waves travel at the same speed, they may differ in their wavelength and frequency.
0.51707
NDQ_016181
amontons developed his law in the
null
a. 1500s., b. 1600s., c. 1700s., d. 1800s.
b
T_4885
text
null
How fast or slow something moves is its speed. Speed determines how far something travels in a given amount of time. The SI unit for speed is meters per second (m/s). Speed may be constant, but often it varies from moment to moment.
0.515745
NDQ_016181
amontons developed his law in the
null
a. 1500s., b. 1600s., c. 1700s., d. 1800s.
b
T_2576
text
null
Sequencing the human genome has increased our knowledge of genetic disorders. Genetic disorders are diseases caused by mutations. Many genetic disorders are caused by mutations in a single gene. Others are caused by abnormal numbers of chromosomes.
0.505434
NDQ_016181
amontons developed his law in the
null
a. 1500s., b. 1600s., c. 1700s., d. 1800s.
b
T_4999
text
null
Wave speed is the distance a wave travels in a given amount of time, such as the number of meters it travels per second. Wave speed (and speed in general) can be represented by the equation: Speed = Distance Time
0.50427
NDQ_016181
amontons developed his law in the
null
a. 1500s., b. 1600s., c. 1700s., d. 1800s.
b
T_0726
text
null
Nuclear energy is produced by splitting the nucleus of an atom. This releases a huge amount of energy.
0.497145
NDQ_016181
amontons developed his law in the
null
a. 1500s., b. 1600s., c. 1700s., d. 1800s.
b
T_3871
text
null
We use electricity for many purposes. Devices such as lights, stoves, and stereos all use electricity and convert it to energy in other forms. However, devices may vary in how quickly they change electricity to other forms of energy.
0.49484
NDQ_016181
amontons developed his law in the
null
a. 1500s., b. 1600s., c. 1700s., d. 1800s.
b
T_4715
text
null
Compare and contrast the basic properties of matter, such as mass and volume.
0.494671
NDQ_016181
amontons developed his law in the
null
a. 1500s., b. 1600s., c. 1700s., d. 1800s.
b
T_4893
text
null
A given kind of matter has the same chemical makeup and the same chemical properties regardless of its state. Thats because state of matter is a physical property. As a result, when matter changes state, it doesnt become a different kind of substance. For example, water is still water whether it exists as ice, liquid water, or water vapor.
0.493975
NDQ_016252
the spoiler on a racecar causes air pressure to push the car forward.
null
a. true, b. false
b
T_3905
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textbook_images/generating_and_using_electricity_22508.png
FIGURE 25.9 This simple setup shows how electromagnetic induction occurs.
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textbook_images/microwaves_22951.png
FIGURE 1.3
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textbook_images/electromagnetic_induction_22800.png
FIGURE 1.1
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textbook_images/pressure_of_fluids_22300.png
FIGURE 15.10 How does Bernoullis law explain each of these examples?
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textbook_images/compound_machine_22737.png
FIGURE 1.1
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textbook_images/properties_of_electromagnetic_waves_22425.png
FIGURE 21.4 Light slows down when it enters water from the air. This causes the wave to refract, or bend.
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textbook_images/early_space_exploration_20346.png
FIGURE 23.12 A rocket pushes in one direction so that it moves in the opposite direction.
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abc_question_images/earth_eclipses_11627.png
earth_eclipses_11627.png
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textbook_images/petroleum_power_21021.png
FIGURE 1.1
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question_images/parts_chordate_body_7157.png
parts_chordate_body_7157.png
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Most cars have at least four cylinders connected to the crankshaft. Their pistons move up and down in sequence, one after the other. A powerful car may have eight pistons, and some race cars may have even more. The more cylinders a car engine has, the more powerful its engine can be.
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In a car, the piston in the engine is connected by the piston rod to the crankshaft. The crankshaft rotates when the piston moves up and down. The crankshaft, in turn, is connected to the driveshaft. When the crankshaft rotates, so does the driveshaft. The rotating driveshaft turns the wheels of the car.
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Poor air quality started to become a serious problem after the Industrial Revolution. The machines in factories burned coal. This released a lot of pollutants into the air. After 1900, motor vehicles became common. Cars and trucks burn gasoline, which adds greatly to air pollution.
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Although all electromagnetic waves travel at the same speed, they may differ in their wavelength and frequency.
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The speed of sound is the distance that sound waves travel in a given amount of time. Youll often see the speed of sound given as 343 meters per second. But thats just the speed of sound under a certain set of conditions, specifically, through dry air at 20 C. The speed of sound may be very different through other matter or at other temperatures.
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Distance is the length of the route between two points. The distance of a race, for example, is the length of the track between the starting and finishing lines. In a 100-meter sprint, that distance is 100 meters.
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Friction is the force that opposes motion between any surfaces that are in contact. There are four types of friction: static, sliding, rolling, and fluid friction. Static, sliding, and rolling friction occur between solid surfaces. Fluid friction occurs in liquids and gases. All four types of friction are described below.
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How fast or slow something moves is its speed. Speed determines how far something travels in a given amount of time. The SI unit for speed is meters per second (m/s). Speed may be constant, but often it varies from moment to moment.
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We usually cant sense the air around us unless it is moving. But air has the same basic properties as other matter. For example, air has mass, volume and, of course, density.
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The short term cycling of carbon begins with carbon dioxide (CO2 ) in the atmosphere.
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