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SAT Subject Test: Physics Formulas

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

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. Apparent weight (weight of submerged object)
Apparent weight = Fb- weight= (mfg) - (m0g) = (mass of displaced fluid gravity) - (initial mass of object while hanging in air gravity) = (DfVfg)- (DoVog)
Y= 1/ v(1-(v/c)²)
R= ?L/A = (resistivity)(length of wire) / (cross sectional Area)
The volume of the object.

2. Binding energy formula
Voltage=PE/q (remember Joules/Coulomb= volt)
Ebinding= ?m * c² (= (?m)c²)
Law of inertia. Object in motion stays in motion unless acted upon by an outside force.
Longer ? - larger diffraction - smaller shadow.

3. Beat frequency
For every action there is an equal and opposite reaction
Positive - focus in front of the lens (=real image)
Beat frequency= |F1-F2|
V= 331 m/s + (.6 m/s°C)Temperature

4. Graviational force formula
P=IV=I²R=V² /R = Fd/t= Force*velocity
F=GM1M2/r²
Positive - focus in front of the lens (=real image)
Apparent weight = Fb- weight= (mfg) - (m0g) = (mass of displaced fluid gravity) - (initial mass of object while hanging in air gravity) = (DfVfg)- (DoVog)

5. Ideal gas law
F=mv²/ r
Positive - focus in front of the lens (=real image)
PV=nRT (p= pressure - V= volume - n= number of moles - T= temperature in KELVIN - R= .0821)
Zero.

6. Voltage formula (for circuit - etc.)
E=hf (= Planck's constant*frequency)
Q= [(mass of A + mass of B) - (mass of C + mass of D)] c² (where A+B-->C+D)
V=IR
PEspring= 1/2 kx² (K is spring constant - X is distance spring compressed)

7. Index of refraction formula
N= C/velocity.
Law of inertia. Object in motion stays in motion unless acted upon by an outside force.
W=(Force parallel)(distance)= Pressure ? V (change in volume)= qvoltage
Momentum is always conserved in the absence of an outside force

8. Elastic potential energy for a spring formula
PEspring= 1/2 kx² (K is spring constant - X is distance spring compressed)
Fingers= Magnetic Field - Thumb=Velocity - Palm of hand= Force. RH=Proton - LH= electron.
Negative - focus behind the lens (= virtual image)
?= 4L + 1.6d

9. How to find total magnification?

10. Formula for electric potential energy?
Vfinal²=V0²+ 2ad
EMFavg. induced= -?Fb/ ?t (= - change in mag flux/change in time)
PE= 1/2 C (?V)² = 1/2 Q²/C = 1/2 Q?V
Felec=qE=[kq1q2]/r²

11. Formula for how velocity changes in air? (probably don't have to know)
Fb= mass of displaced fluid * gravity
V= 331 m/s + (.6 m/s°C)Temperature
Intensity a Amplitude/ d²
For every action there is an equal and opposite reaction

12. mass of a proton/neutron (there's a slight difference but ignore it - neutron has slightly more mass)
E0= 8.85 * 10?¹² C²/(Nm²)
1/f= 1/di + 1/do
Ebinding= ?m * c² (= (?m)c²)
1.67*10?²7kg

13. Newton's second law
Minimum frequency that needs to illuminate a metal surface for photoELECTRONS to be emitted
Fnet=ma
Fingers= Magnetic Field - Thumb=Velocity - Palm of hand= Force. RH=Proton - LH= electron.
Low

14. Conversion factor from atomic mass units to MeV?
Minimal energy that needs to be imparted to an electron on metal surface in order to liberate it.
W=qVoltage. (think C* J/C and C's cancel out)
931MeV=1amu
Q=m*L (where L is the latent heat of fusion or vaporization)

15. Heat formula
W=qVoltage. (think C* J/C and C's cancel out)
1.6*10?¹? C
Q=mc?T (where T is temperature)
?Tstationary= Y (?Tmoving)

16. Formula for energy of a photon?

17. deBroglie wavelength explanation
?=h/p (where p= MOMENTUM=m?v - and h is planck's constant)
Particles in motion can display wave characteristics - and behave as if they had wavelength (?= h/p)
Beat frequency= |F1-F2|
F=mv²/ r

18. Relativistic formula for velocity
K= 9 * 10? Nm²/C²
Intensity a Amplitude/ d²
Vstationary obj.= [u+v] / [1 + uv/c²] (where u is velocity of large object - and v is velocity of "thrown" object relative to large object)
Law of inertia. Object in motion stays in motion unless acted upon by an outside force.

19. Formula for electric field?
En= [Z²/n² * -13.6ev ] (Z is number of protons in atom's nucleus - n is energy level number)
E= kq/r² (= f/q)
V=IR
A= A0 e ^ [-?t] (= activity at time t=0 e ^ ( - decay constant * time)

20. ß? decay?
Proton--> Neutron + positron (+ electron-neutrino - v) (° +1 e is produced)
E= kq/r² (= f/q)
?IE= - W (work)
PV/nT'= p'V'n'T' (p=pressure - V= VOLUME - T= temperature)

21. Sign of focus for concave lens?
931MeV=1amu
?Tstationary= Y (?Tmoving)
V= 331 m/s + (.6 m/s°C)Temperature
Positive - focus in front of the lens (=real image)

22. Formula for diffraction pattern - Anti-node to Anti-node (A-A)
C= Q/V = e0 *A/d
N?/ d= x/L (where x =distance between c and the anti-node - L =distance from screen to source - n=number anti-node - and d = distance between the slits)
Fnet=ma
Force magnetic= |q|vBsin? (=qVperpendicularB) (?= angle between v and B)

23. Relativistic formula for length
E= kq/r² (= f/q)
S= 1/2at² + v0t+ d0 (intial distance is often ignored because we decide where we want to start)
?Tstationary= Y (?Tmoving)
Length stationary=Length moving/Y

24. Relativistic formula for (kinetic) energy
Atom + electron--> Neutron (the addition of an electron - °?1e - causes a proton to change into a neutron - i.e. PROTON TRANSFORMS)
Fingers= Magnetic Field - Thumb=Velocity - Palm of hand= Force. RH=Proton - LH= electron.
Distance= velocity * time
KE= (Y-1)mc² (= (Y-1)E)

25. Work (only in terms of charge and voltage) formula

26. Newton's third law
PEspring= 1/2 kx² (K is spring constant - X is distance spring compressed)
PE= 1/2 C (?V)² = 1/2 Q²/C = 1/2 Q?V
F=ILBsin? (?= angle btw. L and B)
For every action there is an equal and opposite reaction

27. Moment of Inertia (a.k.a. rotational mass)
Negative - focus behind the lens (= virtual image)
I=mr²
En= [Z²/n² * -13.6ev ] (Z is number of protons in atom's nucleus - n is energy level number)
?Tstationary= Y (?Tmoving)

28. OPEN PIPE FREQUENCY (Frequency/Harmonic series of a pipe opened at both ends)
F= n * vel/2L n= 1 - 2 - 3... (L= length of pipe) (?=2L/n)
For every action there is an equal and opposite reaction
Ebinding= ?m * c² (= (?m)c²)
S= 1/2at² + v0t+ d0 (intial distance is often ignored because we decide where we want to start)

29. Law of refraction
Longer ? - larger diffraction - smaller shadow.
Ni sin?i=nrsin?r
The volume of the object.
M= -di/do (=-hi/ho)

30. Conservation of momentum
Minimal energy that needs to be imparted to an electron on metal surface in order to liberate it.
Momentum is always conserved in the absence of an outside force
(n-1/2)?/ d= x/L (where x =distance between c and the anti-node - L =distance from screen to source - n=number anti-node - and d = distance between the slits)
PEspring= 1/2 kx² (K is spring constant - X is distance spring compressed)

31. Efficiency of an engine formula
Product of each lens's magnification
?V2/?V1= N2/N1 (if secondary greater than primary it's a step-up transformer).
Eff= 1- Qc/Qh = 1- Tc/Th
For every action there is an equal and opposite reaction

32. Binding energy explanation
Low
Energy it takes to break a nucleus into separate protons and neutrons (same as energy lost to create atom.)
E= V/d
Q= [(mass of A + mass of B) - (mass of C + mass of D)] c² (where A+B-->C+D)

33. deBrolglie wavelength formula

34. Formula for energy levels within any atom?

35. Voltage formula (think units of volts are what?) (NOT in terms of I and R)
Voltage=PE/q (remember Joules/Coulomb= volt)
A=v²/ r
Zero.
E= kq/r² (= f/q)

36. If you drop an object into water the volume displaced equals...
F= (9/5)C+ 32
The volume of the object.
En= [Z²/n² * -13.6ev ] (Z is number of protons in atom's nucleus - n is energy level number)
C= 3*108 m/s

37. Internal energy....equals?
F=GM1M2/r²
Fnet=ma
?IE= - W (work)
931MeV=1amu

38. Formula for magnetic flux?
Fb= Bperp-to-areaAcos? (Measures density of magnetic field lines that cross through an area)
Q= [(mass of A + mass of B) - (mass of C + mass of D)] c² (where A+B-->C+D)
E=hf (= Planck's constant*frequency)
E= kq/r² (= f/q)

39. Heat of fusion/vaporization fromula
PV/nT'= p'V'n'T' (p=pressure - V= VOLUME - T= temperature)
Y= 1/ v(1-(v/c)²)
Fb= Bperp-to-areaAcos? (Measures density of magnetic field lines that cross through an area)
Q=m*L (where L is the latent heat of fusion or vaporization)

40. Magnetic force formula (for wire)?
Force magnetic= |q|vBsin? (=qVperpendicularB) (?= angle between v and B)
F=ILBsin? (?= angle btw. L and B)
R= ?L/A = (resistivity)(length of wire) / (cross sectional Area)
V=IR

41. Formula for diffraction pattern - Anti-node to node (A-N)
6.6310 ?³4 Js
Longer ? - larger diffraction - smaller shadow.
Apparent weight = Fb- weight= (mfg) - (m0g) = (mass of displaced fluid gravity) - (initial mass of object while hanging in air gravity) = (DfVfg)- (DoVog)
(n-1/2)?/ d= x/L (where x =distance between c and the anti-node - L =distance from screen to source - n=number anti-node - and d = distance between the slits)

42. Newton's first law (Law of...)
PV=nRT (p= pressure - V= volume - n= number of moles - T= temperature in KELVIN - R= .0821)
M= -di/do (=-hi/ho)
Law of inertia. Object in motion stays in motion unless acted upon by an outside force.
F=mv²/ r

43. Work performed by charge displacement? (hopefully...won't have to know)
KE= (Y-1)mc² (= (Y-1)E)
Induced current will flow opposite direction of magnetic flux.
W= - kq1q2 (1/r2 - 1/r1)
R= ?L/A = (resistivity)(length of wire) / (cross sectional Area)

44. Thin lens equation
Voltage=PE/q (remember Joules/Coulomb= volt)
?Tstationary= Y (?Tmoving)
E= V/d
1/f= 1/di + 1/do

45. Law of reflection
F= (9/5)C+ 32
Force magnetic= |q|vBsin? (=qVperpendicularB) (?= angle between v and B)
E=hf (= Planck's constant*frequency)
Angle of incidence=Angle of reflection

46. Momentum formula?
Large/high
1/f= 1/di + 1/do
Neutron --> Proton + electron ( + electron-antineutrino - V with line over it) ( °?1e produced)
P=mv (?p=m?v)

47. Total KE formula
Etotal= E rest + KE= mc² + (Y-1)mc²
Proton--> Neutron + positron (+ electron-neutrino - v) (° +1 e is produced)
Ebinding= ?m * c² (= (?m)c²)
E= V/d

48. New/old gas formula?

49. Electron capture
Zero.
Atom + electron--> Neutron (the addition of an electron - °?1e - causes a proton to change into a neutron - i.e. PROTON TRANSFORMS)
?p=f?t (where f is AVERAGE force and t is how long force is applied)
Particles in motion can display wave characteristics - and behave as if they had wavelength (?= h/p)

50. K constant for electric field formula?
A=v²/ r
Y= 1/ v(1-(v/c)²)
K= 9 * 10? Nm²/C²
PE= 1/2 C (?V)² = 1/2 Q²/C = 1/2 Q?V