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# Force per unit area - PowerPoint PPT Presentation

Force per unit area. Density Buoyancy Pressure Power. 16 of 30. Mass per unit volume. Density Buoyancy Pressure Power. 20 of 30. Upward force experienced by an object immersed in a fluid. Density Buoyancy Pressure Power. 21 of 30.

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## PowerPoint Slideshow about ' Force per unit area' - bruno

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Presentation Transcript

• Density

• Buoyancy

• Pressure

• Power

16 of 30

• Density

• Buoyancy

• Pressure

• Power

20 of 30

• Density

• Buoyancy

• Pressure

• Power

21 of 30

The buoyant force experienced by an object equals the weight of the fluid it displaces.

• Archimedes’ principle

• Pascal’s principle

• Bernoulli’s Law

• The ideal gas law

19 of 30

Changes in pressure are transmitted throughout a fluid. of the fluid it displaces.

• Archimedes’ principle

• Pascal’s principle

• Bernoulli’s Law

• The ideal gas law

20 of 30

A Pascal is equal to one of the fluid it displaces.

• Gram/cubic centimeter

• Joule/second

• Newton/square meter

• Joule/kilogram/Kelvin

20 of 30

The ______ is equal on each cylinder of a hydraulic lift. of the fluid it displaces.

• Pressure

• Force

• Area

• Displacement

21 of 30

Density equals: of the fluid it displaces.

• m/V

• F/A

• rVg

• aLoDT

21 of 30

The buoyant force equals the ____ of the displaced fluid of the fluid it displaces.

• Density

• Mass

• Volume

• Weight

21 of 30

The average kinetic energy of a particle in random thermal motion describes

• Heat

• Thermal Energy

• Mechanical Energy

• Temperature

21 of 30

1.0 L of gas is initially at a temperature of -73 motion describesoC and a pressure of 80 kPa. If the temperature is raised to 23oC with no change of volume the new pressure will be:

• 27 kPa

• 120 kPa

• 160 kPa

• 180 kPa

18 of 30

If a 24 kg object rests on a surface with an area of 0.08 m motion describes2 it exerts a pressure of:

• 300 Pa

• 3.0 kPa

• 0.0033 Pa

• 55 psi

21 of 30

Which formula could be used to solve a problem about hydraulic lifts?

• P1V1/T1 = P2V2/T2

• DL=aLDT

• P=Po + rhg

• F1/A1=F2/A2

23 of 30

Which formula could be used to determine the pressure exerted by a fluid at a certain depth?

• FB=rVg

• r=m/V

• P=Po+rhg

• P=W/t

22 of 30

When heat is added to a substance at its melting point its temperature increases.

• True

• False

23 of 30

The increase in thermal energy needed to raise one unit of mass by one unit of temperature is called:

• Heat of vaporization

• Specific Heat

• Coefficient of linear thermal expansion

19 of 30

23 of 30 mass by one unit of temperature is called:

The first law of thermodynamics states that:

• The internal energy of a system can be increased by doing work or adding heat.

• The bouyant force equals the weight of fluid displaced.

• The entropy of the universe is always increasing.

23 of 30 mass by one unit of temperature is called:

The relationship between heat energy and temperature change is given by the formula:

• Q=mcDT

• DL=aLoDT

• PV=nRT

• P=W/t

23 of 30 mass by one unit of temperature is called:

When a chocolate bar is cut in half its density is…

• Halved

• Unchanged

• Doubled

23 of 30 mass by one unit of temperature is called:

One kilogram of styrofoam has _____ density than one kilogram of iron

• A smaller

• A greater

• The same

22 of 30 mass by one unit of temperature is called:

If a loaf of bread is compressed, its _____

• Mass decreases

• Volume increases

• Density increases

• None of these

23 of 30 mass by one unit of temperature is called:

A wooden block has a mass of 800 g and a volume of 2 cm3. What is the block’s density?

• 800 g/cm3

• 400 g/cm3

• 1600 g/cm3

• 0.4 g/cm3

• 0.025 cm3/g

22 of 30 mass by one unit of temperature is called:

Water pressure is greatest against the _____

• Top of a submerged object

• Bottom of a submerged object

• Sides of a submerged object

• None of these

23 of 30 mass by one unit of temperature is called:

A completely submerged object always displaces an amount of fluid equal to its own:

• Volume

• Weight

• Density

• Mass

22 of 30 mass by one unit of temperature is called:

One liter of water has a mass of:

• 1 kg

• 1 N

• Both of these

• Neither of these

21 of 30 mass by one unit of temperature is called:

What is the buoyant force acting on a 34,000 N ship that is floating in the ocean?

• Less than 34,000 N

• 34,000 N

• More than 34,000 N

• Depends on the density of the sea water

19 of 30 mass by one unit of temperature is called:

What is the weight of water which is displaced by a floating 34,000 N ship?

• Less than 34,000 N

• 34,000 N

• More than 34,000 N

• Depends on the ship’s shape

• Depends on the density of the seawater

21 of 30 mass by one unit of temperature is called:

An object that is partly or entirely immersed in a liquid is buoyed up by a force that is:

• Equal to its own weight

• Equal to the weight of the fluid it displaces.

• Equal to the density of the fluid it is in.

• Equal to the volume of the fluid it is in.

22 of 30 mass by one unit of temperature is called:

A rock suspended by a weighing scale weighs 5.0 N out of water and 3.0 N when submerged in water. What is the buoyant force acting on the rock?

• 5.0 N

• 3.0 N

• 2.0 N

• 8.0 N

• None of these

21 of 30 mass by one unit of temperature is called:

Compared to an empty ship, the same ship loaded with styrofoam will float:

• Higher in the water

• Lower in the water

• At the same level in the water.

23 of 30 mass by one unit of temperature is called:

A block of styrofoam floats on a lake while a block of lead with equal volume lies submerged at the bottom of the lake. The buoyant force is greatest on the:

• Styrofoam

• Is the same for both

22 of 30 mass by one unit of temperature is called:

A suction cup sticks to a wall. It is ____.

• Pulled to the wall by the vacuum

• Pushed to the wall by the atmosphere

• Both of these

• Neither of these