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AP Physics Formulas

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Answer 50 questions in 15 minutes.
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This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. formula for the wavelength (debroglie wavelength) of a moving particle
delta x = (Vo)t + .5at^2
h/wavelength
(Patm) + (Pgauge)
h/mv

2. the electric force between two objects of charge Q
G M/((d/2)^2)
roegh
K |q||Q|/r^2
qV

3. magnification equation
(I^2)RT
elastic collision
pL/A
(Di)/(Do) or (Hi)/(Ho)

4. what direction is friction?
GM*M/(r^2)
(EMF)Rt/10
frequency never changes for light problems
opposite motion

5. isometric
rF
(V^2)/R
constant volume
n(Cv)(deltaT)

6. force of friction
AV=(A2)(V2)
dSintheta=mwavelength
(Fn)(mu)
no heat flow

7. formula for efficiency of a heat engine using work out
M(Lf)
(Wnet)/(Qin)
L -LCostheta
sqrt(3KT/m)

8. formula for finding the magnetic field a distance r from a current carrying wire
h/wavelength
hc/wavelength
h(Fo)
KI/r

9. formula for finding the qacceleration due to gravity at the surface of a planet of mass M and diameter d
GM*M/(r^2)
qE
G M/((d/2)^2)
(3/2)nRdeltaT

10. formula for height of the block (at the start of a pendulum string) in terms of theta and L
(EMF)Rt/10
L -LCostheta
sqrt(T/(m/))
hc/wavelength

11. second kinematic
1/((1/C)+(1/C)..........)
(1/Do) + (1/Di) = (1/f)
sqrt(3KT/m)
delta x = (Vo)t + .5at^2

12. isothermal
no temp change
h(Fo)
(Patm) + (Pgauge)
rF

13. formula for finding the momentum of a photon
h/wavelength
1/((1/C)+(1/C)..........)
((Qin) -(Qout))/(Qin)
1/2wavelength

14. lens/mirror equation
qE
qV
(1/Do) + (1/Di) = (1/f)
KQ/r

15. formula equating energy and mass
no force (right hand rule)
E/B
e=mc^2
V+IR

16. force of frction on an incline
mgCostheta(mu)d
GM*M/(r^2)
d/2
G M/((d/2)^2)

17. formula for efficiency not using work out
k|Q|/r^2
hc/wavelength
constant volume
((Qin) -(Qout))/(Qin)

18. isobaric
L -LCostheta
m(v^2)/qvB
opposite motion
constant pressure

19. focal length of a mirror with radius d
1/2wavelength
G M/((d/2)^2)
d/2
F/A

20. formula for centripetal acceleration
(EMF)Rt/10
((Th) -(Tl))/(Th)
J= Ft
(V^2)/r

21. change in internal energy during a cyclic process
-KA
(3/2)nRdeltaT
qVB
0

22. heat required to melt a substance
M(Lf)
2Pi * sqrt(l/g)
k|Q|/r^2
rF

23. pressure
(V^2)/r
roegh
F/A
BA

24. energy stored in a capacitor
.5CV^2 or .5 Q^2/C or .5QV
hc/wavelength
(N2)/(N1)
K |q||Q|/r^2

25. adibatic
((Th) -(Tl))/(Th)
m(v^2)/qvB
h/wavelength
no heat flow

26. energy of a photon if wavelength is known
d/2
Columbs/second
V+IR
hc/wavelength

27. force of gravity between two objects of mass m
GM*M/(r^2)
-KA
G M/((d/2)^2)
Q=CV

28. type of collision where K is conserved
(Fn)(mu)
Ed=V
(3/2)nRdeltaT
elastic collision

29. formula for finding the work function of a metal if the cutoff frequency is known
(Di)/(Do) or (Hi)/(Ho)
0
h(Fo)
(V^2)/r

30. forgotten power equation
VI
FV
((Qin) -(Qout))/(Qin)
d/2

31. formula for charge stored in a capciator
opposite motion
Q=CV
1/2wavelength
(Di)/(Do) or (Hi)/(Ho)

32. electric field in a distance r from a charge
1/4wavelength
((Th) -(Tl))/(Th)
k|Q|/r^2
-KA

33. total capacitance of capacitors in series
no force (right hand rule)
K |q||Q|/r^2
Q=CV
1/((1/C)+(1/C)..........)

34. type of collision where objects stick togerther
1/4wavelength
perfectly inelastic collision
(I^2)RT
joules/second

35. the units of power other than watts
frequency never changes for light problems
(N2)/(N1)
2Pi * sqrt(l/g)
joules/second

36. the force on a charge moving parallel to a magnetic field
E/B
VI
.5CV^2 or .5 Q^2/C or .5QV
no force (right hand rule)

37. formula to find the gauge pressure at the bottom of a pool
constant volume
net work = delta K
roegh
(Fn)(mu)

38. heat during a cyclic process (net heat)
opposite motion
joules/second
inelastic collision
deltaU -deltaW

39. formula for impulse involving momentum
sqrt(3KT/m)
constant pressure
mV -m(Vo)
L -LCostheta

40. formula for energy of a spring mass when spring is at maximum displacement
1/((1/C)+(1/C)..........)
sqrt(T/(m/))
((Th) -(Tl))/(Th)
.5KA^2

41. natural frequency of a closed tube of length L
Joules/Columb
1/4wavelength
V+IR
qVB

42. formula for power with current and resistance
(I^2)R
.5CV^2 or .5 Q^2/C or .5QV
sqrt(T/(m/))
roeVg

43. formula for power with current and voltage
((Th) -(Tl))/(Th)
opposite motion
VI
m(v^2)/qvB

44. force a charge in a Bfield
qVB
(EMF)Rt/10
KI/r
.5KA^2

45. formula for torque
(I^2)R
-KA
rF
net work = delta K

46. units for voltage other than volts
(Wnet)/(Qin)
Joules/Columb
opposite motion
GM*M/(r^2)

47. the force on a charge in an electric field
(3/2)nRdeltaT
Q=CV
J= Ft
qE

48. velocity of waves on a string if tension is known
qrB/m
sqrt(T/(m/))
e=mc^2
-KA

49. third kinematic
0
V^2=(Vo)^2 +2a*change in x
(I^2)R
d/2

50. new wavelength of light as it enters a new substance
G M/((d/2)^2)
(No)(wavelength)=(Nn)(new wavelength)
0
(V^2)/r

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AP Physics Formulas

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