physics

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Author:
walk1010
ID:
27400
Filename:
physics
Updated:
2010-07-20 01:59:09
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physics
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physics
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  1. The Big 5
    • 1) x = vt = ½ (v0 + v)t
    • 2) x = v0t + ½ a t2
    • 3) x = vt - ½ a t2
    • 4) v = v0 + at
    • 5) v2 = v02 + 2ax
    • 6) v = (2gh)1/2
  2. Stress
    stress = F/A
  3. Strain
    strain = ∆L / L
  4. Hooke's Law
    • ∆L = FL/EA
    • *where E is the modulus of elasticity
  5. Torque
    t = rF sinθ
  6. Impluse
    J = FT = ∆p
  7. Work
    W = Fd cosθ
  8. Power (with respect to work)
    • P = W/t = Fv
    • * only if F//v
  9. Density of H2O
    ρ = 1000 kg/m3 = 1 g/cm3
  10. Bernoulli's Equation
    P1 + ρ1gy1 + ½ ρv12= P2 + ρ2gy2 + ½ ρv2
  11. Pascal's Law
    F1 / A1 = F2 / A2
  12. Volume Flow Rate and Continuity Equation
    • Q = AV
    • A1V1 = A2V2
  13. Hydrostatic Pressure
    P = P0 + ρgD = Patm + ρgD (if P at surface is Patm)
  14. Fraction Submerged
    • % submerged = Vsub / Vobject = ρojbect / ρfluid
  15. Current
    i = Q/t
  16. Power in AC Circuit
    P = irmsVrms = imax / √2 * Vmax / √2
  17. Resistance
    R = ρL / A
  18. Potential Energy of Spring
    PE = ½ kx2
  19. Frequency of Pendulums and Springs
    • Springs: w = 1/2π √k/m (wackem)
    • Pendulums: w = 1/2π √g/l (wiggle)
  20. Harmonic Wavelength of Open Pipe and Closed Pipe
    • Open: λ = 2L/n
    • Closed: λ = 2L/n
  21. Coulomb's Law
    FE = k Qq / r2
  22. Electric Field due to Q
    E = k Q/r2
  23. Electric Force by Field
    FE = qE
  24. Electric Potential Due to Q
    V = kQ/r
  25. Magnetic Force
    FM = qvB sin θ
  26. Capicitance
    C = kε0A/D = Q/V
  27. Electric Field Between Plates
    • V = ED
    • E = V/D
  28. Potential Energy of Capictors
    PE = ½QV = ½CV2
  29. Capacitors in Parallel
    Cp = C1 + C2 + ...
  30. Speed of Sound
    V = √ B/ρ
  31. Intensity
    I = Power / A
  32. Intensity in dB
    β = 10 log I/I0
  33. Doppler Effect
    • fD = fs * v ± vD / v -+ vs
    • *approaching means increasing f
  34. index of refraction
    n = c/v
  35. Total Internal Refraction
    • sin θcrit = n2 / n1
    • *where n2 < n1
  36. Joul

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