Pressur

Question 1

When the two faucets are opened (at the same height), which flow rate of water is greater?
full or half full

Answer 1

The full tank
core principles of water pressure:
- The flow of water out of a tank is caused by differences in water pressure.
- The pressure at any point under the water increases with the height of the water above it.

Question 2

Pressure doesn’t point in any particular direction.

Answer 2

unlike forces…

Question 3

Which direction will water flow through this hose? (voir image)

Answer 3

Water won’t flow through the hose.

Wherever the hose connects to the tank, the water in it has the same pressure as the tank water that’s at the same level. As a result, there is no pressure gradient at the points of connection.
Another perspective is that even though the hose has water inside it, the weight of the water will counteract this difference in pressure so that all the water remains still.
If this weren’t the case, you’d never have a still body of water!

– Pressure changes along a hose in the same way it changes in a tank, so water won’t flow through a hose unless it has an outlet.

Question 4

The pressure depends only on the height of the water level above the end of the hose.

Answer 4

The flow of water out of a tank is caused by differences in water pressures.

The pressure at any point under the water increases with the height of the water above it.

Pressure doesn’t point in any particular direction.

Question 5

Pressure in the barrel doesn’t depend on the weight of the water inside it, only on the height of the water above it.

Answer 5

Blaise Pascal exploited this fact to delight audiences across Europe with the magic of physics. He reasoned that he could generate enough pressure to shatter a barrel using only a few liters of water in a tall and narrow tube.

Question 6

How much mass can the 10 kg mass on the left side support on the right while the water levels are even, if the narrow tank has a radius 1/20 the radius of the wide tank?

Answer 6

4000 kg

• Since the heights are the same, the volume increase depends on the area of the tank.

πr**2

if the radius is 20x larger, then the area us 400x larger