Studied by 0 peopleWhen a burner injects a flame into the mouth of a hot air balloon, what happens?
heat increases the temperature of the air inside and it expands
In terms of liquids, viscosity increases as _______ decreases.
temperature
Rate the following fluids in order from lowest viscosity to highest viscosity:
Ketchup>milk>cold air>hot air
Which statement about temperature and gasses is true?
As the temperature of a gas increases, its viscosity increases as well
As a liquid is cooled
its flow rate will decrease.
Engineers who design large pipes to carry raw bitumen (thick and heavy tar) to upgraders must consider the properties of fluids. Which choice is least likely to affect the flow of bitumen?
Thickness of the pipe metal
How could you measure the flow rate of various liquids?
Pour them down an incline
Which word best sums up the nature of viscosity?
Resistance
A technician wants to transport nitrogen gas through a series of small pipes in an experiment. He wants to maximize the flow rate of the nitrogen through the small pipes, so he should
cool the gas down as much as possible.
Which fluid at room temperature would have the most interaction between its particles?
Air
A grape floats in corn syrup. This means that
the density of the grape is less than the density of the corn syrup.
Which will not increase the buoyancy of a metal boat?
how longer and narrower the boat is
Which statement about density is false?
Ice sinks in water because it is colder and therefore it is denser
250 mL of an unknown sample weighs 200 g. What is its density?
0.8 g/mL
What is the unit for measuring the density of a solid?
g/cm cubed
if the density of an unknown sample is 1.2 g/cm³, how much mass would a 10 cm³ sample contain?
12 grams
The Bermuda triangle has fascinated people for decades. One explanation for the disappearances of ships in that area has focused on the presence of vast fields of methane hydrates on the continental shelves. Laboratory experiments carried out in Australia have proven that bubbles of this gas can decrease the density of seawater. This means missing ships may have
sank
Which of the following can be expressed using the unit of force?
Pressure and buoyancy
Which statement about pressure is false?
Pressure is for fluids what density is for solids
What is a reason why air exerts less pressure as you go up in altitude?
There are fewer layers of air above you
What eventually happens to all weather balloons as they rise through the atmosphere?
They become taught and burst
What causes the pressure of a compressed gas in an aerosol can?
Gas particles colliding against the inside walls
The humpback anglerfish lives at a depth of 2000 m down. Researchers would like to bring one to the surface to study it but most attempts to do have failed. Why do you think that is?
"explode"
Temperature affects pressure. What is not an example of this phenomenon?
A man uses a pressure washer to clean his patio
What is not a unit of pressure?
Meters per second squared
Which of the following would be most compressible?
A beach ball filled with air
A meteorologist on television states that a low-pressure weather system is in your area. This means that air surrounding this system is
rushing toward it, creating wind.
At 0°C the viscosity of hydrogen gas is 8.4 x 10-6 Pa•s. (Pa•s is called a Pascal second, the standard unit of viscosity.) What would happen to the viscosity of hydrogen gas if it were cooled to -25 °C
viscosity would decrease
There are three ways in which you can describe viscosity. Which descriptive phrase is least appropriate for describing viscosity?
kinetic energy
Motor oil must work under temperature extremes. If motor oil is too thick the moving parts of the engine have to work harder against the increased oil friction. If the motor oil is too thin, its lubricating quality is reduced. Multi-grade motor oils contain additives that make them more effective over a wide range of temperatures. What do these additives do?
They reduce how much oil viscosity changes with temperature.
Which statement about the behaviour of gases is true?
A sample of a cooled gas weighs more than a sample of the same gas at a higher temperature.
What is an acceptable unit of density?
grams/millilitre
What does the blue arrow represent in this diagram of an object floating in a fluid?
buoyant force
If continued heating of the air eventually makes the balloon rise in the air, what must be true?
The heating decreases the density of the air in the balloon, which in increases the buoyant force on the balloon.
Viscosity
the resistance of a fluid to flow.
friction.
a force that works to slow down motion as a result of surfaces rubbing against each other.
flow rate
a measure of the speed at which a fluid flows from one point to another.
Density
it describes how closely packed together the particles are in a substance.
Archimedes
His principle states that the buoyant force on an object is equal to the weight of the fluid displaced by the object.
Buoyancy
is the tendency of an object in a fluid to rise or sink due to density differences with its surroundings.
buoyant force
is the upward force exerted by a fluid
Plimsoll line
shows how heavily a ship can be safely loaded in different water conditions
Pressure
is the amount of force applied to a given area.
Compression
is a decrease in volume caused by a force.
Compressibility
is the property of being able to be compressed.
Incompressible.
they cannot be compressed easily
Note
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