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The Big 5
1) x = vt = ½ (v
_{0 }
+ v)t
2) x = v
_{0}
t + ½ a t
^{2}
3) x = vt - ½ a t
^{2}
4) v = v
_{0 }
+ at
5) v
^{2}
= v
_{0}
^{2}
+ 2ax
6) v = (2gh)
^{1/2}
Stress
stress = F/A
Strain
strain = ∆L / L
Hooke's Law
∆L = FL/EA
*where E is the modulus of elasticity
Torque
t = rF sinθ
Impluse
J = FT = ∆p
Work
W = Fd cosθ
Power (with respect to work)
P = W/t = Fv
* only if F//v
Density of H
_{2}
O
ρ = 1000 kg/m
^{3}
= 1 g/cm
^{3}
Bernoulli's Equation
P
_{1 }
+ ρ
_{1}
gy
_{1}
+ ½ ρv
_{1}
^{2}
= P
_{2}
+ ρ
_{2}
gy
_{2}
+ ½ ρv
^{2}
Pascal's Law
F
_{1}
/ A
_{1 }
= F
_{2}
/ A
_{2}
Volume Flow Rate and Continuity Equation
Q = AV
A
_{1}
V
_{1 }
= A
_{2}
V
_{2}
Hydrostatic Pressure
P = P
_{0}
+ ρgD = P
_{atm }
+ ρgD (if P at surface is P
_{atm}
)
Fraction Submerged
% submerged = V
_{sub}
/ V
_{object}
= ρ
_{ojbect }
/ ρ
_{fluid}
Current
i = Q/t
Power in AC Circuit
P =
i
_{rms}
V
_{rms }
= i
_{max }
/ √2 * V
_{max}
/ √2
Resistance
R = ρL / A
Potential Energy of Spring
PE = ½ kx
^{2}
Frequency of Pendulums and Springs
Springs
: w = 1/2π √k/m (wackem)
Pendulums
: w = 1/2π √g/l (wiggle)
Harmonic Wavelength of Open Pipe and Closed Pipe
Open
: λ = 2L/n
Closed
: λ = 2L/n
Coulomb's Law
F
_{E}
= k Qq / r
^{2}
Electric Field due to Q
E = k Q/r
^{2}
Electric Force by Field
F
_{E}
= qE
Electric Potential Due to Q
V = kQ/r
Magnetic Force
F
_{M}
= qvB sin θ
Capicitance
C = kε
_{0}
A/D = Q/V
Electric Field Between Plates
V = ED
E = V/D
Potential Energy of Capictors
PE = ½QV = ½CV
^{2}
Capacitors in Parallel
C
_{p}
= C
_{1}
+ C
_{2}
+ ...
Speed of Sound
V = √ B/ρ
Intensity
I = Power / A
Intensity in dB
β = 10 log I/I
_{0}
Doppler Effect
f
_{D}
= f
_{s * }
v ± v
_{D}
/ v -+ v
_{s}
*
approaching means increasing f
_{ }
_{}
index of refraction
n = c/v
Total Internal Refraction
sin θ
_{crit}
= n
_{2}
/ n
_{1}
*where n
_{2 }
<
_{ }
n
_{1}
Joul
Author
walk1010
ID
27400
Card Set
physics
Description
physics
Updated
2010-07-20T05:59:09Z
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