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AP Physics Formulas

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Answer 50 questions in 15 minutes.
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1. formula for charge stored in a capciator
roegh
1/((1/C)+(1/C)..........)
Q=CV
constant pressure

2. pressure
2nt=mwavelength
F/A
1/((1/C)+(1/C)..........)
constant pressure

3. formula for finding magnetic flux
BA
Q=CV
((Th) -(Tl))/(Th)
h(Fo)

4. velocity of a charge traveling at a constant veloc ity through crossed E and B fields
F/A
qrB/m
E/B
k|Q|/r^2

5. adibatic
no heat flow
(hc/wavelength)=h(Fo) +(Vs)
(EMF)Rt/10
perfectly inelastic collision

6. the force on a charge moving parallel to a magnetic field
k|Q|/r^2
no force (right hand rule)
MC(deltaT)
(V^2)/R

7. change in internal energy during a cyclic process
0
no temp change
e=mc^2
((Th) -(Tl))/(Th)

8. formula used to find the heat generated by a resistor after a certain amount of time if the current through the resistor is known
(I^2)RT
G M/((d/2)^2)
(3/2)nRdeltaT
M(Lf)

9. focal length of a mirror with radius d
dSintheta=mwavelength
GM*M/(r^2)
d/2
FV

10. force of frction on an incline
mgCostheta(mu)d
qV
m(v^2)/qvB
h/wavelength

11. formula to find the absoluate pressure at the bottom of a pool
(Patm) + (Pgauge)
(hc/wavelength)=h(Fo) +(Vs)
MC(deltaT)
2nt=mwavelength

12. EMF of a battery having internal resistance R
V+IR
M(Lf)
((Th) -(Tl))/(Th)
0

13. formula for height of the block (at the start of a pendulum string) in terms of theta and L
h/mv
(No)(wavelength)=(Nn)(new wavelength)
2nt=mwavelength
L -LCostheta

14. formula for energy of a spring mass when spring is neither at maximum displacement nor at equilibrium
pL/A
.5mV^2 + .5KA^2
(Patm) + (Pgauge)
(1/Do) + (1/Di) = (1/f)

15. heat during a cyclic process (net heat)
m(v^2)/qvB
.5mV^2 + .5KA^2
0
deltaU -deltaW

16. formula for efficiency of a heat engine using work out
J= Ft
(Patm) + (Pgauge)
(Wnet)/(Qin)
rF

17. formula equating energy and mass
e=mc^2
Joules/Columb
(Wnet)/(Qin)
F/A

18. heat required to melt a substance
1/2wavelength
0
M(Lf)
(I^2)R

19. velocity of a molecule of gas
qVB
sqrt(3KT/m)
sqrt(T/(m/))
BA

20. velocity of waves on a string if tension is known
dSintheta=mwavelength
KI/r
((Qin) -(Qout))/(Qin)
sqrt(T/(m/))

21. lens/mirror equation
(1/Do) + (1/Di) = (1/f)
((Qin) -(Qout))/(Qin)
L -LCostheta
no heat flow

22. formula for buoyant force
Q=CV
roeVg
(Di)/(Do) or (Hi)/(Ho)
(hc/wavelength)=h(Fo) +(Vs)

23. formula for impulse involving momentum
(EMF)Rt/10
mV -m(Vo)
((Th) -(Tl))/(Th)
V^2=(Vo)^2 +2a*change in x

24. formula to find the gauge pressure at the bottom of a pool
deltaU = deltaQ + deltaW
roegh
delta x = (Vo)t + .5at^2
((Qin) -(Qout))/(Qin)

25. formula for power with current and resistance
Joules/Columb
(I^2)R
(Fn)(mu)
MC(deltaT)

26. velocity of an electrion as it exitws from the hole
qrB/m
Columbs/second
constant pressure
d/2

27. voltage induced in a rod moving through a uniform magnetic field
(Patm) + (Pgauge)
e=mc^2
(V^2)/r
BLv

28. natural frequency of an open tube of length L
deltaU = deltaQ + deltaW
1/2wavelength
opposite motion
(Fn)(mu)

29. the force on a charge in an electric field
deltaU -deltaW
VI
e=mc^2
qE

30. what direction is friction?
opposite motion
(Di)/(Do) or (Hi)/(Ho)
inelastic collision
MC(deltaT)

31. electric field in a distance r from a charge
Columbs/second
sqrt(T/(m/))
((Th) -(Tl))/(Th)
k|Q|/r^2

32. electric potential a distance r from a charge
h/wavelength
(No)(wavelength)=(Nn)(new wavelength)
KQ/r
(V^2)/R

33. equation for the first law of thermodynamics
qrB/m
n(Cv)(deltaT)
Columbs/second
deltaU = deltaQ + deltaW

34. snells law
deltaU -deltaW
net work = delta K
(N2)/(N1)
nSintheta=nsintheta

35. formula for the wavelength (debroglie wavelength) of a moving particle
Q=CV
(Patm) + (Pgauge)
constant volume
h/mv

36. formula for period of a pendulum
M(Lf)
2Pi * sqrt(l/g)
deltaU -deltaW
(3/2)nRdeltaT

37. formula for power with Voltage and resistance
((Qin) -(Qout))/(Qin)
perfectly inelastic collision
dSintheta=mwavelength
(V^2)/R

38. formula for power with current and voltage
KQ/r
roegh
VI
0

39. formula for torque
rF
e=mc^2
sqrt(T/(m/))
h/wavelength

40. formula for constructive interference in a thin membrane with two phase changes
2nt=mwavelength
joules/second
h/mv
opposite motion

41. energy stored in a capacitor
BA
.5CV^2 or .5 Q^2/C or .5QV
deltaU = deltaQ + deltaW
BLv

42. magnification equation
(Di)/(Do) or (Hi)/(Ho)
.5KA^2
(1/Do) + (1/Di) = (1/f)
GM*M/(r^2)

43. force a charge in a Bfield
(N2)/(N1)
Q=CV
h/mv
qVB

44. work energy theorum
BA
(3/2)nRdeltaT
net work = delta K
.5mV^2 + .5KA^2

45. formula for critical angle
mgCostheta(mu)d
(N2)/(N1)
m(v^2)/qvB
(hc/wavelength)=h(Fo) +(Vs)

46. formula for finding the momentum of a photon
Joules/Columb
h/wavelength
L -LCostheta
K |q||Q|/r^2

47. formula for efficiency not using work out
((Qin) -(Qout))/(Qin)
BA
sqrt(T/(m/))
mV -m(Vo)

48. type of collision where K is not conserved
(3/2)nRdeltaT
Q=CV
constant volume
inelastic collision

49. heat required to change temperature of a substance
frequency never changes for light problems
qV
MC(deltaT)
hc/wavelength

50. formula for finding the work function of a metal if the cutoff frequency is known
(V^2)/r
((Qin) -(Qout))/(Qin)
F/A
h(Fo)

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AP Physics Formulas

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