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MCAT Self Study > Fluids > Flashcards

Flashcards in Fluids Deck (19)
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1
Q

What is the formula for density?

A

Density = mass / volume

Units: kg/ m^3

2
Q

What is specific gravity?

A

Specific gravity is the density in relation to the density of water.

Px/ PH2O

3
Q

What is the formula for pressure?

A

Pressure is equal to the force / area.

N/ m^2 are the units.

4
Q

What is the density of water?

A

1000kg/m^3, 1g/ml.

5
Q

What is the formula for pressure of an object caused by a fluid, or the gauge pressure.

A

Pressure = depth(gravity)(density of fluid)

the force felt is due to the weight of the fluid above the object.

6
Q

How do you calculate the total pressure of an object under water?

A

Patm + Pfluid.

Patm + gph.

7
Q

How do you calculate buoyant force?

A

Force = density of the fluid ( Volume displaced) ( gravity)

8
Q

How can you calculate the volume of an object?

A

Submerge it in water. The amount of fluid displaced will be equal to the volume of the object.

9
Q

Why does an object float?

A

It is less dense then the fluid and therefore will float.

10
Q

How do you calculate % submerged?

A

density object/ density fluid FOR SUBMERGED.

11
Q

How do you calculate S.g for sunken objects?

A

Weight/ Buoyant Force.

Buoyant force is weight- apparent force.

12
Q

Describe surface tension of water

A

Surface tension pulls together the water molecules at the surface of the fluid.

13
Q

What is Poiseille’s Principle?

A

Q = pi(r)^4 [P1-P2]/ 8nL

If you change the radius then it is ^4 the change.

14
Q

What is the formula for fluid continuity?

A

AV= AV.

15
Q

What is Bernolui’s equation?

A

P + pdh + .5mp^2= constant

Increase velocity, decreases pressure

16
Q

Buoyant force is always equal to:

A

weight of the fluid displaced.

17
Q

Relate density and acceleration.

A

The smaller the density, the faster the object will accelerate to the top.

18
Q

Which formula states how fluid flows through a small hole?

A

v = sqroot 2gh

19
Q

What is the ratio of work done by pistons?

A

1 because it’s same force and distance.