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AP Physics Formulas

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Answer 50 questions in 15 minutes.
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1. formula for constructive interference in a diffraction grating
roegh
delta x = (Vo)t + .5at^2
dSintheta=mwavelength
d/2

2. total capacitance of capacitors in series
VI
1/((1/C)+(1/C)..........)
Q=CV
qE

3. pressure
KQ/r
(Wnet)/(Qin)
perfectly inelastic collision
F/A

4. formula used to find the heat generated by a resistor after a certain amount of time if the current through the resistor is known
1/4wavelength
qVB
F/A
(I^2)RT

5. formula for power with current and voltage
constant pressure
VI
k|Q|/r^2
Columbs/second

6. formula for impulse involving momentum
(N2)/(N1)
mV -m(Vo)
V+IR
1/((1/C)+(1/C)..........)

7. formula for efficiency not using work out
2Pi * sqrt(l/g)
0
((Qin) -(Qout))/(Qin)
BA

8. natural frequency of an open tube of length L
1/2wavelength
constant pressure
rF
inelastic collision

9. isometric
k|Q|/r^2
constant volume
E/B
.5KA^2

10. the units of power other than watts
.5KA^2
joules/second
(EMF)Rt/10
-KA

11. velocity of a charge traveling at a constant veloc ity through crossed E and B fields
(V^2)/R
L -LCostheta
E/B
KQ/r

12. heat during an isometric process
K |q||Q|/r^2
MC(deltaT)
n(Cv)(deltaT)
d/2

13. formula for Carnot efficiency
dSintheta=mwavelength
((Th) -(Tl))/(Th)
inelastic collision
pL/A

14. resistance of a wire
J= Ft
pL/A
e=mc^2
Columbs/second

15. velocity of waves on a string if tension is known
(N2)/(N1)
e=mc^2
no force (right hand rule)
sqrt(T/(m/))

16. equation of continuity
AV=(A2)(V2)
BA
sqrt(T/(m/))
2nt=mwavelength

17. formula for buoyant force
roeVg
hc/wavelength
deltaU -deltaW
KI/r

18. isobaric
FV
constant pressure
sqrt(T/(m/))
qE

19. new frequency of light as it enters a new substance
d/2
frequency never changes for light problems
V+IR
deltaU = deltaQ + deltaW

20. formula for period of a pendulum
2Pi * sqrt(l/g)
Joules/Columb
((Th) -(Tl))/(Th)
(I^2)R

21. formula for height of the block (at the start of a pendulum string) in terms of theta and L
KQ/r
L -LCostheta
(Wnet)/(Qin)
frequency never changes for light problems

22. heat during a cyclic process (net heat)
deltaU -deltaW
V^2=(Vo)^2 +2a*change in x
roeVg
net work = delta K

23. equation for the first law of thermodynamics
V^2=(Vo)^2 +2a*change in x
deltaU = deltaQ + deltaW
.5KA^2
1/((1/C)+(1/C)..........)

24. formula equating energy and mass
e=mc^2
dSintheta=mwavelength
V+IR
pL/A

25. hooke's law force of a spring
Joules/Columb
E/B
V^2=(Vo)^2 +2a*change in x
-KA

26. force a charge in a Bfield
qVB
BLv
dSintheta=mwavelength
V = (Vo) + at

27. velocity of an electrion as it exitws from the hole
Columbs/second
(EMF)Rt/10
qrB/m
(V^2)/R

28. EMF of a battery having internal resistance R
0
V+IR
((Th) -(Tl))/(Th)
roegh

29. type of collision where K is conserved
Joules/Columb
deltaU = deltaQ + deltaW
1/2wavelength
elastic collision

30. lens/mirror equation
(hc/wavelength)=h(Fo) +(Vs)
1/2wavelength
m(v^2)/qvB
(1/Do) + (1/Di) = (1/f)

31. formula for change in internal energy in a cosnstat volume PV process
frequency never changes for light problems
V+IR
(3/2)nRdeltaT
Q=CV

32. new wavelength of light as it enters a new substance
deltaU = deltaQ + deltaW
(No)(wavelength)=(Nn)(new wavelength)
1/4wavelength
(hc/wavelength)=h(Fo) +(Vs)

33. formula for impluse involving time
E/B
2nt=mwavelength
perfectly inelastic collision
J= Ft

34. formula for finding the momentum of a photon
h/mv
h/wavelength
h(Fo)
qV

35. the force on a charge moving parallel to a magnetic field
deltaU -deltaW
Ed=V
(EMF)Rt/10
no force (right hand rule)

36. formula for finding the qacceleration due to gravity at the surface of a planet of mass M and diameter d
pL/A
dSintheta=mwavelength
roegh
G M/((d/2)^2)

37. units for voltage other than volts
V^2=(Vo)^2 +2a*change in x
Joules/Columb
sqrt(T/(m/))
(Di)/(Do) or (Hi)/(Ho)

38. formula for the wavelength (debroglie wavelength) of a moving particle
MC(deltaT)
k|Q|/r^2
h/mv
frequency never changes for light problems

39. formula for energy of a spring mass when spring is at maximum displacement
(N2)/(N1)
2nt=mwavelength
.5KA^2
inelastic collision

40. second kinematic
opposite motion
delta x = (Vo)t + .5at^2
Columbs/second
1/2wavelength

41. force of gravity between two objects of mass m
(1/Do) + (1/Di) = (1/f)
KI/r
GM*M/(r^2)
(I^2)RT

42. what direction is friction?
nSintheta=nsintheta
G M/((d/2)^2)
opposite motion
(1/Do) + (1/Di) = (1/f)

43. natural frequency of a closed tube of length L
.5CV^2 or .5 Q^2/C or .5QV
G M/((d/2)^2)
1/4wavelength
MC(deltaT)

44. heat required to melt a substance
net work = delta K
2Pi * sqrt(l/g)
M(Lf)
(I^2)R

45. formula for power with current and resistance
G M/((d/2)^2)
1/2wavelength
(Di)/(Do) or (Hi)/(Ho)
(I^2)R

46. formula for constructive interference in a thin membrane with two phase changes
2nt=mwavelength
J= Ft
0
.5KA^2

47. voltage induced in a rod moving through a uniform magnetic field
1/((1/C)+(1/C)..........)
BLv
inelastic collision
qV

48. the electric force between two objects of charge Q
J= Ft
K |q||Q|/r^2
M(Lf)
inelastic collision

49. electric potential a distance r from a charge
K |q||Q|/r^2
mgCostheta(mu)d
e=mc^2
KQ/r

50. third kinematic
V^2=(Vo)^2 +2a*change in x
qV
(Di)/(Do) or (Hi)/(Ho)
2Pi * sqrt(l/g)

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AP Physics Formulas

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