# MCAT Physics 3

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1. Atmospheric Pressure
Force per unit area exerted upon a surface by the weight of the air above that surface in the atmosphere.
2. Fluid Pressure
Force exerted by a fluid on a point equal to the density of the fluid times the depth.
3. Gauge Pressure
The pressure difference between a system and the surrounding atmosphere.
4. 1 atm equivalents
• 760 torr
• 760 mmHg
• 101 kPa
• 101,000 Pa
• 14.7 psi
5. General Pressure formula
P = F/A

Pressure = Force / Area
6. Fluid Pressure formula
P = gh

• (rho) = fluid density
• g = gravity
• h = height of fluid
7. Specific Gravity formula
SG = Dsubstance/DH2O

D = density
8. Density of water
• 1000 kg/m3
• 1.0 g/cm3
9. Volume measurements of water
1cm3 = 1mL
10. Mass of water
1L = 1kg

1mL = 1gram
11. For objects floating in fluid, the fraction submerged =
The ratio of the density of the object to the density of the liquid.
12. Archimede's Principle
The buoyant force is exactly equal to the weight of the displaced fluid.
13. Buoyancy formula
Fbuoyant = vg

• = fluid density
• v = volume of displaced fluid
• g = gravity
14. Apparent Weight
The apparent weight of a submerged object is the actual weight minus the buoyant force.

The apparent weight gives us 1) the buoyant force and 2) the weight of that volume of fluid.
15. Flow Rate formula
• Q = AV
• Q = flow
• A = cross-sectional area of tube (m2)
• V = velocity of the fluid (m/s)

Application (cardiac output = stroke volume x heart rate)
16. Bernoulli's Equation
K = P + gh + 1/2 v2

• P = random kinetic energy of the fluid molecules
• gh = the gravitational potential energy of the fluid
• 1/2v2 = the energy due to moving fluid molecules
• K = a constant
17. Velocity of H2O exiting a spigot formula
v = √(2gh)
18. Surface Tension
The intensity of intermolecular forces per unit length at the surface of a liquid.
An attraction between unlike particles.
20. Cohesion
An attraction between particles of the same kind.
21. Charge magnitude of an electron
e- = 1.6 E-19 C
22. Current flows...
From positive (+) to negative (–)
23. Electrons flow...
From negative (–) to positive (+)
24. What is current?
The flow of eletrons from areas of higher density (where they strongly repel each other) to areas of lower density (where there is less repulsion).
25. Electric Field
Field = an invisible influence that can exert a force on a mass or charge.
26. Point Charge Field
Equates to "real" gravity or gravity in space.
27. Constant Electric Field
Equate to "assumed" gravity or gravity near earth.
28. Electric field equivalent to "g" gravity
E - Strength of electric field
29. Electric field equivalent to "G" gravity constant
K - constant
30. Electric field equivalent to "h" height
31. Electric field equivalent to "m" inertial component
q - charge
32. Strength of an e-field formula
E = V/d

• E - strength of an electric field
• V - voltage
• d - distance
33. Voltage for point charge e-field formula
V = Kq/r

• V - voltage
• K - constant
34. Voltage formula
V = PE/q

Voltage is equal to potential energy over charge
35. Resistance formula
R = pL/A

• p - resistivity
• L - length
• A - cross-sectional area
36. Potential Energy of a capacitor formula
PE = 1/2 CV2

C - capacitance

V - voltage

C = Q/V

Q - charge
37. Dielectric characteristics
• Insulator
• Polarizable
• Resistor
• Makes more charge build up on the plates
38. Variables that affect capacitance
• Plate area (directly related)
• Plate thickness (no effect)
• Distance between plates (inversely related)
• Strength of dielectric (directly related)
39. Capacitor charge vs. time graph
40. Conceptual ideas of a battery
• Positive terminal has highest electric potential.
• Electrons build up on negative terminal and move to positive.
41. Conceptual ideas of a resistor
• There is always a voltage drop across any resistor.
• Current through a resistor is inversely related to resistance. 2x resistance = 1/2 current.
42. Solving circuits
• Must be simplified, eg. no more than one of each component.
• 1. Resistors in series: add directly
• 2. Resistors in parallel: add the inverses and take the inverse
• 3. Capacitors in series: add the inverses and take the inverse
• 4. Capacitors in parallel: add directly
• 5. Batteries in series: add directly
• 6. Batteries in parallel: total voltage = the highest voltage of any one of the batteries in parallel
43. Ohm's Law
V = IR

• V - voltage
• I - current
• R - resistance
44. Electric power formula
P = IV

P - power
45. AC vs. DC
• Alternating current is created by a generator and can be represented by a sine wave.
• Direct current is created by a battery.
46. Fmagnet on a charged particle formula
F = qvBsin

• F - force
 Author: Maki6tu ID: 138798 Card Set: MCAT Physics 3 Updated: 2013-06-11 16:55:30 Tags: Physics Folders: Description: Physics Show Answers: