fluid statics

Define the pressure p

• p=perpendicular force/surface

• p=surface/perpendicular force

• p=perpendicular force*surface

• p=mg

define density d

• d=volume/mass

• d=mass/volume

• d=mass/g

• d=mass*volume

how to calculate the volume

• volume=density/mass

• volume=density/volume

• volume=mass/density

• volume=density*g

define weight force

• weight force=mass*gravity acceleration

• weight force=density*volume*pressure

• weight force=density*g

• weight force=mass

Pascal's Law states that

• any pressure applied to the surface of a fluid is transmitted uniformly throughout the fluid in all directions

• any pressure applied to the volume of a fluid is transmitted uniformly throughout the fluid in all directions

• any pressure applied to the surface of a fluid is transmitted not uniformly throughout the fluid in all directions

• any pressure applied to the surface of a fluid is transmitted uniformly throughout the fluid in any directions

A cube of wood with a density of 0.780 g/cm³ is 10.0 cm on each side. When the cube is placed in water, what buoyant force acts on the wood? ( density of water = 1.0 g/cm³)

• 7.65 x 10³ N

• 5.00 N

• 7.65 N

• 6.40 N

Tags

NGSS.MS-PS3-4

A water bed that is 1.5 m wide and 2.5 m long weighs 1055 N. Assuming the entire lower surface of the bed is in contact with the floor, what is the pressure the bed exerts on the floor?

• 250 Pa

• 260 Pa

• 270 Pa

• 280 Pa

A force of 30.0 N is exerted on a small piston of the hydraulic system. The cross-sectional area of the small piston is 0.05 m² and that of the large piston is 0.10 m². The weight of the object that the large piston can lift is ____.

• 60 N

• 40 N

• 100 N

• 150 N

Tags

NGSS.HS-PS2-1

A dam is constructed with wider and thicker base. Why is it wider and thicker at the base than at the top?

• Much water is at the base than at the top.

• Water is heavier at the base than at the top.

• Liquid pressure is greater at the base than at the top.

• It is easier to construct a structure with wider base & narrow top.

Tags

NGSS.HS-ETS1-3

NGSS.HS-PS2-4

A constant pressure of 2 N/m² acts on a given surface. This means ________

• a force of 2 N acts on every 1 m² of the surface.

• a force of 2 N acts on every 1 m of the surface.

• a force of 2 N acts on the whole surface.

• the area of the whole surface is 2 m².