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AP Physics B: Formulas

Instructions:

Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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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. vrms (2 equations)
v3kT/m [mass per molecule] - v3RT/M [molar mass]
1/2QV=U
Efficiency of an Ideal Engine
n1sin?1=n2sin90

2. A1V1 = A2V2
KE=1/2mv²
Power from Force
Continuity
Adiabatic and isothermal processes ec= TH-TL/

3. Centripetal force
n1sin?1=n2sin?2
f=mv²/r
Flux (in webers)=Bcos?A
?P=rho(g)?h

4. Simple harmonic motion - pendulum
T=2pvl/g
KE=1/2mv²
Average Molecular Kinetic Energy
Pressure from Depth

5. Power (circuts)
Constructive: 2t=m? - Destructive: 2t=m?+1/2?
T=2pvl/g
Work
P=IV

6. v = v0 + at
Kinematic with Velocity - Acceleration - and Time
billiard balls - no sticking total energy is conserved
Power from Energy
C=KepA/d

7. Capacitors in series
Kinematic with Velocity - Acceleration - and Time
V=added - Q=constant - C= 1/C
Constructive: 2t=m?+1/2? - Destructive: 2t=m?
E=-N Change in flux/?t=Blv (v=velocity of the wire)

8. Average kinetic energy
Average Molecular Kinetic Energy
I=?q/?t
V=constant - I=added - R=1/r added
Kavg=(3/2)kbT

9. On a banked curve in circular motion - Fn in the y is
Sum of all currents (I) entering=sum of all currents (I) leaving
Fny=FnCos?
Centripetal Acceleration
P=IV

10. Parallel Circuits
V=constant - I=added - R=1/r added
?U=Q + W - heat added= heat + work
Spring Potential Energy
Force of Spring

11. Power - simple formula (mechanics)
P=W/T=FD/T=FV
Centripetal Acceleration
V=constant - Q=added - C=added
L=n/2?

12. Centripetal acceleration
Kinematic with Displacement - Velocity - Acceleration - and Time
a=v²/r
W is positive when work is done on the system - compression - W is negative when work is done by the system - expansion
T=2pvm/k

13. Couloms law (force between two charged objects)
T=2pr/v
F=kQ1Q2/r² BREAK INTO VECTORS
R=rho L/A A=cross sectional area
1ev=1.6E-19J

14. Engines (2 equations)
Flux (in webers)=Bcos?A
Fnet=rhofluid vfluid g -rho object vobject g where the volumes are usually equal
QH=QL +W and e=W/QH
billiard balls - no sticking total energy is conserved

15. Velocity of sound in a strong
Sum of all currents (I) entering=sum of all currents (I) leaving
V=vFt/(m/l)
?U=W - no heat added system (Q=0)
V=IR

16. Period for circular motion
Fgy=FgSin?
Fnet=rhofluid vfluid g -rho object vobject g where the volumes are usually equal
px and py are conserved
T=2pr/v

17. Vsound
SG=rho object/10³
Efficiency of a Heat Engine
W is positive when work is done on the system - compression - W is negative when work is done by the system - expansion
V=(331 +.6T) T=temp in Celsius

18. Voltage across a battery terminal
Vab=Rated voltage-IR (r=internal resistance)
A1V1=A2V2
Power from Energy
P1atm + 1/2rhoV1² + rhogh= P2atm + 1/2rhoV2² + rhogh

19. Series Circuits
on a solenoid wrap finger around direction of current - thumb will point in north pole direction
V=added - I=constant - R= added
P=mv (Kg m/s) or (N s)
Fx=mv²/r=FnSin?

20. Voltage-charges formula (2)
P1atm + 1/2rhoV1² + rhogh= P2atm + 1/2rhoV2² + rhogh
V=W/Q=KQ/r NO VECTORS
sum of voltages must be zero
Efficiency of a Heat Engine

21. v² = v0² + 2a(x-x0)
PV=nRT - PV=N (# of molecules)kb (bozons constant)T
sum of voltages must be zero
Kinematic with Velocity - Acceleration - and Displacement
q=K?AT/L

22. v = v(3RT)/M = v(3KT)/µ
V=vFt/(m/l)
Average Speed of each Molecule
P=mv (Kg m/s) or (N s)
Ug= Gm1m2/r

23. heat flow through a window or door
Q=CV
Power from Force
n1sin?1=n2sin90
q=K?AT/L

24. Isovolumetric/isochoric
Force of Gravity
?v=0 - w=0 area under the curve is zero
?U=W - no heat added system (Q=0)
F=ma

25. snells law
J=?vm=F?t
n1sin?1=n2sin?2
V=Ed
Power from Force

26. e = abs(W/Q)
1ev=1.6E-19J
General Pressure
Pressure is constant ?P=0 w=-P?V
Efficiency of a Heat Engine

27. Magnitude of gravitational forces between objects
T=2pvl/g
F=Gm1m2/r²
Adiabatic and isothermal processes ec= TH-TL/
V=IR

28. K = (3/2)kT
Fy=FnCos?-Fg
Average Molecular Kinetic Energy
V=W/Q=KQ/r NO VECTORS
v3kT/m [mass per molecule] - v3RT/M [molar mass]

29. Capacitance
Adiabatic and isothermal processes ec= TH-TL/
General Pressure
Kinematic with Velocity - Acceleration - and Displacement
Q=CV

30. Isothermal process
Kinematic with Velocity - Acceleration - and Displacement
Temperature is constant - ?U=0 - -Q=W
q=K?AT/L
in series - measures current - low resistance

31. Force on a charged particle in a magnetic field
F=Gm1m2/r²
Fb=mf g= rhof Vf g
F=Bvsin?q
a=v²/r

32. Dialectrics insulating sheet between plates
Ideal Gas Law
sum of voltages must be zero
Efficiency of an Ideal Engine
C=KepA/d

33. Ideal gas laws
PV=nRT - PV=N (# of molecules)kb (bozons constant)T
Archimedes Principle/Bouyancy
E=F/q (point charge)=KQ1/r² BREAK INTO VECTORS
sum of voltages must be zero

34. U(spring) = ½kx²
?v=0 - w=0 area under the curve is zero
F=Bvsin?q
Spring Potential Energy
General Pressure

35. Banked curve - sum of the forces in the x
General Pressure
PE=1/2kx²
Fy=FnCos?-Fg
Fx=mv²/r=FnSin?

36. 1st right hand rule
Average Molecular Kinetic Energy
Sum of all currents (I) entering=sum of all currents (I) leaving
shows magnetic field created by a current. Thumb in direction of the current - fingers show direction of field
?L=(coefficient of linear expansion)aLinitial?T

37. Electron volts
Fnet=rhofluid vfluid g -rho object vobject g where the volumes are usually equal
1ev=1.6E-19J
Kinetic Energy
F=kx

38. Kinetic energy
px and py are conserved
273K and 1.013E5 pa
L=n/4? has to be odd numbers
KE=1/2mv²

39. 3rd right hand rule
Pressure from Depth
?L=(coefficient of linear expansion)aLinitial?T
thumb in direction of proton - fingers in direction of magnetic field and palm will show you force
QH=QL +W and e=W/QH

40. 2nd right hand rule
F=BIL
General Pressure
Vf=Vi+ at - Vf²=Vi² +2ad - d=1/2 a t² +vit
on a solenoid wrap finger around direction of current - thumb will point in north pole direction

41. Net force/apparent weight in forces
Average Molecular Kinetic Energy
Fnet=Fb-Fg
Thermal Conductivity
W is positive when work is done on the system - compression - W is negative when work is done by the system - expansion

42. T = 1/f
Q=CV
Fnet=rhofluid vfluid g -rho object vobject g where the volumes are usually equal
Period in General
px and py are conserved

43. Standard pressure and temperature and pressure
Efficiency of a Heat Engine
Centripetal Acceleration
273K and 1.013E5 pa
P1atm + 1/2rhoV1² + rhogh= P2atm + 1/2rhoV2² + rhogh

44. Impulse
PE=1/2kx²
J=?vm=F?t
Vab=Rated voltage-IR (r=internal resistance)
Adiabatic and isothermal processes ec= TH-TL/

45. Positive torque
Fb=mf g= rhof Vf g
counterclockwise
Ug= Gm1m2/r
Force of Gravity

46. x = x0 + v0t + ½at²
Kavg=(3/2)kbT
1/2QV=U
Kinematic with Displacement - Velocity - Acceleration - and Time
T=2pvl/g

47. Isobaric process
I=?q/?t
Period in General
Pressure is constant ?P=0 w=-P?V
V=(331 +.6T) T=temp in Celsius

48. P(avg) = W/?t
Power from Energy
General Pressure
?U=W - no heat added system (Q=0)
V=added - I=constant - R= added

49. a(centripetal) = v²/r
Kinetic Energy
Centripetal Acceleration
?P=rho(g)?h
sum of voltages must be zero

50. Natural frequency open tube/not in a tub
L=n/2?
V=IR
Force of Gravity
Average Speed of each Molecule