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AP Physics Formulas

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Answer 50 questions in 15 minutes.
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1. formula for energy of a spring mass when spring is at maximum displacement
V+IR
KI/r
.5KA^2
Ed=V

2. formula for finding the momentum of a photon
.5mV^2 + .5KA^2
delta x = (Vo)t + .5at^2
h/wavelength
K |q||Q|/r^2

3. second kinematic
V+IR
AV=(A2)(V2)
delta x = (Vo)t + .5at^2
1/2wavelength

4. formula for Carnot efficiency
(I^2)R
(Di)/(Do) or (Hi)/(Ho)
K |q||Q|/r^2
((Th) -(Tl))/(Th)

5. EMF of a battery having internal resistance R
pL/A
(I^2)RT
V+IR
no force (right hand rule)

6. formula for buoyant force
M(Lf)
e=mc^2
roeVg
pL/A

7. formula for finding the stopping potential of a metal for a wavelength if the cutoff frequency is known
K |q||Q|/r^2
(hc/wavelength)=h(Fo) +(Vs)
(I^2)RT
qVB

8. natural frequency of a closed tube of length L
elastic collision
V = (Vo) + at
(I^2)RT
1/4wavelength

9. formula for centripetal acceleration
(V^2)/r
2Pi * sqrt(l/g)
((Qin) -(Qout))/(Qin)
KQ/r

10. energy stored in a capacitor
J= Ft
2nt=mwavelength
nSintheta=nsintheta
.5CV^2 or .5 Q^2/C or .5QV

11. velocity of waves on a string if tension is known
(Wnet)/(Qin)
perfectly inelastic collision
joules/second
sqrt(T/(m/))

12. equation for the first law of thermodynamics
deltaU = deltaQ + deltaW
n(Cv)(deltaT)
(1/Do) + (1/Di) = (1/f)
(Wnet)/(Qin)

13. work energy theorum
qE
net work = delta K
hc/wavelength
(No)(wavelength)=(Nn)(new wavelength)

14. force of friction
Columbs/second
V = (Vo) + at
FV
(Fn)(mu)

15. natural frequency of an open tube of length L
(Fn)(mu)
Joules/Columb
1/2wavelength
deltaU -deltaW

16. formula for power with Voltage and resistance
.5CV^2 or .5 Q^2/C or .5QV
qrB/m
(V^2)/R
KI/r

17. what direction is friction?
.5mV^2 + .5KA^2
roeVg
m(v^2)/qvB
opposite motion

18. formula to find the gauge pressure at the bottom of a pool
qrB/m
(V^2)/r
k|Q|/r^2
roegh

19. type of collision where K is not conserved
J= Ft
(EMF)Rt/10
inelastic collision
VI

20. velocity of a molecule of gas
sqrt(3KT/m)
qE
0
GM*M/(r^2)

21. the units of power other than watts
joules/second
BLv
KQ/r
(Fn)(mu)

22. force a charge in a Bfield
2Pi * sqrt(l/g)
(3/2)nRdeltaT
qVB
(I^2)RT

23. force of frction on an incline
VI
mgCostheta(mu)d
e=mc^2
(Di)/(Do) or (Hi)/(Ho)

24. lens/mirror equation
0
roeVg
opposite motion
(1/Do) + (1/Di) = (1/f)

25. formula for height of the block (at the start of a pendulum string) in terms of theta and L
(I^2)RT
qV
L -LCostheta
roegh

26. units for voltage other than volts
deltaU = deltaQ + deltaW
K |q||Q|/r^2
Joules/Columb
constant volume

27. third kinematic
(Wnet)/(Qin)
(N2)/(N1)
(hc/wavelength)=h(Fo) +(Vs)
V^2=(Vo)^2 +2a*change in x

28. formula for finding the qacceleration due to gravity at the surface of a planet of mass M and diameter d
sqrt(3KT/m)
mgCostheta(mu)d
G M/((d/2)^2)
1/2wavelength

29. formula for impulse involving momentum
V+IR
mV -m(Vo)
(I^2)RT
J= Ft

30. hooke's law force of a spring
BA
(hc/wavelength)=h(Fo) +(Vs)
.5CV^2 or .5 Q^2/C or .5QV
-KA

31. velocity of a charge traveling at a constant veloc ity through crossed E and B fields
.5CV^2 or .5 Q^2/C or .5QV
E/B
k|Q|/r^2
AV=(A2)(V2)

32. formula used to find the heat generated by a resistor after a certain amount of time if the current through the resistor is known
n(Cv)(deltaT)
h/mv
(I^2)RT
pL/A

33. voltage induced in a rod moving through a uniform magnetic field
sqrt(T/(m/))
BLv
(Patm) + (Pgauge)
(I^2)R

34. formula for power with current and resistance
n(Cv)(deltaT)
(I^2)R
1/((1/C)+(1/C)..........)
h/mv

35. formula for period of a pendulum
mV -m(Vo)
(Di)/(Do) or (Hi)/(Ho)
2Pi * sqrt(l/g)
nSintheta=nsintheta

36. heat required to melt a substance
(I^2)RT
M(Lf)
dSintheta=mwavelength
(1/Do) + (1/Di) = (1/f)

37. electric field in a distance r from a charge
M(Lf)
k|Q|/r^2
(I^2)RT
qrB/m

38. type of collision where objects stick togerther
perfectly inelastic collision
d/2
qE
(Wnet)/(Qin)

39. pressure
n(Cv)(deltaT)
Columbs/second
roeVg
F/A

40. energy of a photon if wavelength is known
hc/wavelength
J= Ft
dSintheta=mwavelength
M(Lf)

41. forgotten power equation
FV
roegh
GM*M/(r^2)
net work = delta K

42. formula for critical angle
(N2)/(N1)
inelastic collision
(I^2)R
qE

43. isometric
.5mV^2 + .5KA^2
constant volume
GM*M/(r^2)
deltaU -deltaW

44. formula for impluse involving time
hc/wavelength
(Di)/(Do) or (Hi)/(Ho)
J= Ft
BA

45. first kinematic
F/A
qE
V = (Vo) + at
(Fn)(mu)

46. total capacitance of capacitors in series
-KA
1/((1/C)+(1/C)..........)
V = (Vo) + at
mgCostheta(mu)d

47. adibatic
no heat flow
BA
FV
n(Cv)(deltaT)

48. change in internal energy during a cyclic process
0
(I^2)RT
KI/r
(EMF)Rt/10

49. heat during a cyclic process (net heat)
qVB
2Pi * sqrt(l/g)
deltaU -deltaW
BA

50. formula for efficiency not using work out
V+IR
constant volume
((Qin) -(Qout))/(Qin)
deltaU -deltaW

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AP Physics Formulas

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