MCAT Physics 3

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Maki6tu
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138798
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MCAT Physics 3
Updated:
2013-06-11 12:55:30
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Physics
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Physics
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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.
  19. Adhesion
    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
    r - radius or distance
  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
    • r - radius
  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

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