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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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