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The equation for gives is solved.
The table has a density of water.
There is a large amount of water.
In this example, the weight of the water is where the Earth's gravity is.
It's reasonable to ask if the dam can provide a force equal to the weight.
The answer is no.
The force of the dam can be smaller than the weight of the water it holds back.
The world's largest hydroelectric plant was completed in 2008, generating power equivalent to 22 average-sized nuclear power plants.
The concrete dam is 2.3 km across.
This dam has a 660 km long reservoir.
More than one million people were displaced by the creation of the dam.
There are many examples of pressures in fluids.
There is a force applied to an area.
There are many other units for pressure that are used in the same way.
millimeters of mercury (mm Hg) is used in the measurement of blood pressure, while pounds per square inch is used as a measure of tire pressure.
When discussing fluids, pressure is important.
The International Space Station has no atmospheric pressure.
Her air tank has a pressure gauge.
If we find the area acted upon, we can find the force exerted from the definition of pressure.
The area of the end of the cylinder is given.
The tank must be strong.
The force exerted by a pressure is proportional to the area acted upon as well as the pressure itself.
The end of the tank exerts force on its inside surface.
The force is exerted by a static or stationary fluid.
We have already seen that fluids can't exert shearing forces.
The fluid pressure is a quantity.
The forces due to pressure are always in a straight line.
Swimmers and the tire feel the pressure.
The tire's pressure exerts forces on all the surfaces it contacts.
The directions and magnitudes of the forces are given by the arrows.
Shearing forces do not exert static fluids.
The swimmer is under pressure since the water would flow into the space he occupies if he were not there.
The forces on the swimmer are represented by the arrows.
The forces underneath are larger due to greater depth, giving a net upward force that is balanced by the swimmer's weight.
As you change the volume, add or remove heat, change gravity, and more, you can see what happens when you put gas in a box.
The properties of the gas vary in relation to each other, if you measure the temperature and pressure.
If you've ever been on a plane or in a swimming pool, you've experienced the effect of depth on pressure in a fluid.
The weight of air above you exerts air pressure on you at the Earth's surface.
The weight of air above you decreases as you climb up in altitude.
With increasing depth, the pressure on you increases.
The pressure on you is caused by the weight of water above you and the atmosphere above you.
If you notice an air pressure change on an elevator ride that transports you many stories, but you only need to dive a meter below the surface to feel a pressure increase, you're in good shape.
Water is much denser than air.
The weight of the fluid is supported by its bottom.
The pressure on the bottom is determined by the weight of the fluid.
The dimensions of the container are related to the volume of the fluid.
The pressure is the weight of the fluid.
The equation has general validity beyond the special conditions.
The surrounding fluid kept the fluid static even if the container weren't there.
The equation shows the pressure due to the weight of the fluid at any depth below its surface.
This equation holds great depths for liquids, which are nearly incompressible.
One can apply this equation if the density changes are small over the depth considered.
The weight of the fluid is supported by the bottom of the container.
The bottom must support the fluid since the vertical sides can't exert an upward force.
Pressure and force will be considered on the dam retaining water.
The water is 80.0 m deep at the dam, which is 500 m wide.
The pressure at the average depth of 40.0 m is the average due to the weight of the water.
The value has already been found.
The force is small compared to the weight of the water in the dam.
It depends on the average depth of the dam and the width and length of the lake.
The force is dependent on the water's average depth and the dimensions of the dam.
In the diagram, the thickness of the dam increases with depth to balance the increasing force due to the increasing pressure.
The dam must be able to hold onto the water.
The force is small compared to the water behind the dam.
The weight of air above a given height is what causes atmospheric pressure.
The atmospheric pressure at the Earth's surface varies a little due to the large-scale flow of the atmosphere.
The average weight of a column of air above the Earth's surface is equivalent to.
The average density of the atmosphere is 120 km.
Compare this density with the air listed in the table.
We have to be atmospheric pressure, given, and known, and so we can use this to calculate.
The average density of air between the Earth's surface and the top of the Earth's atmosphere is 120 km.
Table 11.1 shows the density of air at sea level.
The density of air is the highest near the Earth's surface and plummets with altitude.
The pressure of the water is equal to 1.00 atm.
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