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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. Conservation of momentum
Voltage=PE/q (remember Joules/Coulomb= volt)
Momentum is always conserved in the absence of an outside force
Fb= Bperp-to-areaAcos? (Measures density of magnetic field lines that cross through an area)
M= -di/do (=-hi/ho)

2. Formula for resistance of an OBJECT
Atom + electron--> Neutron (the addition of an electron - °?1e - causes a proton to change into a neutron - i.e. PROTON TRANSFORMS)
Angle of incidence=Angle of reflection
C= Q/V = e0 *A/d
R= ?L/A = (resistivity)(length of wire) / (cross sectional Area)

3. If speed is slow/low - index of refraction is...
I=mr²
F= n * vel./ 4L n= 1 - 3 - 5.... (L= length of pipe) (?=4L/n)
Large/high
W= - kq1q2 (1/r2 - 1/r1)

4. Elastic potential energy for a spring formula
PEspring= 1/2 kx² (K is spring constant - X is distance spring compressed)
P=mv (?p=m?v)
Energy of emitted photon = E2-E1 (=Energy level higher- Energy level lower)
Fingers= Magnetic Field - Thumb=Velocity - Palm of hand= Force. RH=Proton - LH= electron.

5. Formula for velocity of waves?
V=f?
Particles in motion can display wave characteristics - and behave as if they had wavelength (?= h/p)
W=qVoltage. (think C* J/C and C's cancel out)
Torque=force perpendicular to radius r = fr Toruqe=Ia = inertia * angular acceleration

6. Formula for magnetic flux?
Fb= Bperp-to-areaAcos? (Measures density of magnetic field lines that cross through an area)
The incident angle at which total internal reflection occurs (use ?r=90°)
P=IV=I²R=V² /R = Fd/t= Force*velocity
KE=1/2mv²

7. Formula for electric potential energy?
F= n * vel/2L n= 1 - 2 - 3... (L= length of pipe) (?=2L/n)
Etotal= E rest + KE= mc² + (Y-1)mc²
PE= 1/2 C (?V)² = 1/2 Q²/C = 1/2 Q?V
Law of inertia. Object in motion stays in motion unless acted upon by an outside force.

8. Voltage formula (for circuit - etc.)
Q=mc?T (where T is temperature)
A=v²/ r
V=IR
PE=mgh

9. Graviational force formula
E0= 8.85 * 10?¹² C²/(Nm²)
F=GM1M2/r²
Large/high
Induced current will flow opposite direction of magnetic flux.

10. Total KE formula
Etotal= E rest + KE= mc² + (Y-1)mc²
Induced current will flow opposite direction of magnetic flux.
PEspring= 1/2 kx² (K is spring constant - X is distance spring compressed)
Vfinal= V0 +at

11. Capacitance constant
6.6310 ?³4 Js
?V2/?V1= N2/N1 (if secondary greater than primary it's a step-up transformer).
E0= 8.85 * 10?¹² C²/(Nm²)
1.67*10?²7kg

12. High frequency wave shave...
Shorter ? - less diffraction - bigger shadow.
F=ILBsin? (?= angle btw. L and B)
E= kq/r² (= f/q)
?p=f?t (where f is AVERAGE force and t is how long force is applied)

13. New/old gas formula?

14. Activity of a radioactive sample formula? (probably don't have to know)
A= A0 e ^ [-?t] (= activity at time t=0 e ^ ( - decay constant * time)
Q=m*L (where L is the latent heat of fusion or vaporization)
1/f= 1/di + 1/do
Neutron --> Proton + electron ( + electron-antineutrino - V with line over it) ( °?1e produced)

15. Apparent weight (weight of submerged object)
Difference between mass of nucleus and sum of it's constituent nucleons (protons/neutrons ...WHY?) energy lost when atom created. (That energy lost is the same energy it takes to break a nucleus into separate protons and neutrons)
Ebinding= ?m * c² (= (?m)c²)
Ni sin?i=nrsin?r
Apparent weight = Fb- weight= (mfg) - (m0g) = (mass of displaced fluid gravity) - (initial mass of object while hanging in air gravity) = (DfVfg)- (DoVog)

16. Electron capture
Atom + electron--> Neutron (the addition of an electron - °?1e - causes a proton to change into a neutron - i.e. PROTON TRANSFORMS)
Angle of incidence=Angle of reflection
Ni sin?i=nrsin?r
N= C/velocity.

17. ONE END CAPPED PIPE FREQUENCY (Frequency/Harmonic series of a pipe closed at one ned)
G= 6.67 * 10?¹¹ Nm²/kg²
PV/nT'= p'V'n'T' (p=pressure - V= VOLUME - T= temperature)
E= kq/r² (= f/q)
F= n * vel./ 4L n= 1 - 3 - 5.... (L= length of pipe) (?=4L/n)

18. Momentum formula?
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)
P=mv (?p=m?v)
F=mv²/ r
PV/nT'= p'V'n'T' (p=pressure - V= VOLUME - T= temperature)

19. Formula for energy levels within any atom?

20. deBrolglie wavelength formula

21. magnitude of charge on electron/proton
Ebinding= ?m * c² (= (?m)c²)
E= kq/r² (= f/q)
Fnet=ma
1.6*10?¹? C

22. energy in a reaction q formula?
Etotal= E rest + KE= mc² + (Y-1)mc²
F=GM1M2/r²
Q= [(mass of A + mass of B) - (mass of C + mass of D)] c² (where A+B-->C+D)
(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)

23. mass of a proton/neutron (there's a slight difference but ignore it - neutron has slightly more mass)
Low
Fnet=ma
1.67*10?²7kg
?= 4L + 1.6d

24. How to find total magnification?

25. Torque formula
PEspring= 1/2 kx² (K is spring constant - X is distance spring compressed)
Torque=force perpendicular to radius r = fr Toruqe=Ia = inertia * angular acceleration
V=IR
W= - kq1q2 (1/r2 - 1/r1)

26. Work performed by charge displacement? (hopefully...won't have to know)
Difference between mass of nucleus and sum of it's constituent nucleons (protons/neutrons ...WHY?) energy lost when atom created. (That energy lost is the same energy it takes to break a nucleus into separate protons and neutrons)
F= n * vel./ 4L n= 1 - 3 - 5.... (L= length of pipe) (?=4L/n)
W= - kq1q2 (1/r2 - 1/r1)
S= 1/2at² + v0t+ d0 (intial distance is often ignored because we decide where we want to start)

27. deBroglie wavelength explanation
Particles in motion can display wave characteristics - and behave as if they had wavelength (?= h/p)
Positive - focus in front of the lens (=real image)
Q=m*L (where L is the latent heat of fusion or vaporization)
Induced current will flow opposite direction of magnetic flux.

28. Kinetic Energy formula
PE=mgh
The volume of the object.
Q=m*L (where L is the latent heat of fusion or vaporization)
KE=1/2mv²

29. Low frequency waves have...
Etotal= E rest + KE= mc² + (Y-1)mc²
Longer ? - larger diffraction - smaller shadow.
Shorter ? - less diffraction - bigger shadow.
P=mv (?p=m?v)

30. Distance formula?
Apparent weight = Fb- weight= (mfg) - (m0g) = (mass of displaced fluid gravity) - (initial mass of object while hanging in air gravity) = (DfVfg)- (DoVog)
?IE= - W (work)
P=mv (?p=m?v)
Distance= velocity * time

31. Electric force formula? (two)
V= 331 m/s + (.6 m/s°C)Temperature
Large/high
G= 6.67 * 10?¹¹ Nm²/kg²
Felec=qE=[kq1q2]/r²

32. Beat frequency
Beat frequency= |F1-F2|
E0= 8.85 * 10?¹² C²/(Nm²)
Threshold frequency=F/h (= work functions/planck's constant)
Q= [(mass of A + mass of B) - (mass of C + mass of D)] c² (where A+B-->C+D)

33. Sign of focus for convex lens?
S= 1/2at² + v0t+ d0 (intial distance is often ignored because we decide where we want to start)
?p=f?t (where f is AVERAGE force and t is how long force is applied)
Negative - focus behind the lens (= virtual image)
Momentum is always conserved in the absence of an outside force

34. Relativistic factor Y formula
Fb= Bperp-to-areaAcos? (Measures density of magnetic field lines that cross through an area)
Y= 1/ v(1-(v/c)²)
Q=m*L (where L is the latent heat of fusion or vaporization)
?p=f?t (where f is AVERAGE force and t is how long force is applied)

35. Newton's third law
Negative - focus behind the lens (= virtual image)
For every action there is an equal and opposite reaction
Vfinal²=V0²+ 2ad
PE= 1/2 C (?V)² = 1/2 Q²/C = 1/2 Q?V

36. Faraday's law
Q=mc?T (where T is temperature)
F=GM1M2/r²
EMFavg. induced= -?Fb/ ?t (= - change in mag flux/change in time)
Fb= mass of displaced fluid * gravity

37. Newton's second law
Fnet=ma
Fb= mass of displaced fluid * gravity
Energy of emitted photon = E2-E1 (=Energy level higher- Energy level lower)
Q=mc?T (where T is temperature)

38. Centripetal force formula
N= C/velocity.
For every action there is an equal and opposite reaction
Eff= 1- Qc/Qh = 1- Tc/Th
F=mv²/ r

39. Relativistic formula for time
A= A0 e ^ [-?t] (= activity at time t=0 e ^ ( - decay constant * time)
?Tstationary= Y (?Tmoving)
Longer ? - larger diffraction - smaller shadow.
Induced current will flow opposite direction of magnetic flux.

40. Potential Energy formula
PE=mgh
A= A0 e ^ [-?t] (= activity at time t=0 e ^ ( - decay constant * time)
PV=nRT (p= pressure - V= volume - n= number of moles - T= temperature in KELVIN - R= .0821)
931MeV=1amu

41. Energy of an emitted photon formula?
Energy of emitted photon = E2-E1 (=Energy level higher- Energy level lower)
Voltage=PE/q (remember Joules/Coulomb= volt)
Longer ? - larger diffraction - smaller shadow.
Fb= Bperp-to-areaAcos? (Measures density of magnetic field lines that cross through an area)

42. Planck's constant in electronvolts* seconds?
Voltage=PE/q (remember Joules/Coulomb= volt)
931MeV=1amu
4.14 10?¹5 eVs
Threshold frequency=F/h (= work functions/planck's constant)

43. Magnetic force formula (for particle)?
F=ILBsin? (?= angle btw. L and B)
Longer ? - larger diffraction - smaller shadow.
Force magnetic= |q|vBsin? (=qVperpendicularB) (?= angle between v and B)
Particles in motion can display wave characteristics - and behave as if they had wavelength (?= h/p)

44. Heat of fusion/vaporization fromula
?V2/?V1= N2/N1 (if secondary greater than primary it's a step-up transformer).
Induced current will flow opposite direction of magnetic flux.
KE= (Y-1)mc² (= (Y-1)E)
Q=m*L (where L is the latent heat of fusion or vaporization)

45. What is the apparent weight of a floating object?
F=mv²/ r
Apparent weight = Fb- weight= (mfg) - (m0g) = (mass of displaced fluid gravity) - (initial mass of object while hanging in air gravity) = (DfVfg)- (DoVog)
Energy it takes to break a nucleus into separate protons and neutrons (same as energy lost to create atom.)
Zero.

46. (Full) Displacement formula
E= kq/r² (= f/q)
Large/high
S= 1/2at² + v0t+ d0 (intial distance is often ignored because we decide where we want to start)
Ni sin?i=nrsin?r

47. Formula for diffraction pattern - Anti-node to Anti-node (A-A)
F=GM1M2/r²
Longer ? - larger diffraction - smaller shadow.
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)
Force magnetic= |q|vBsin? (=qVperpendicularB) (?= angle between v and B)

48. Voltage formula (think units of volts are what?) (NOT in terms of I and R)
Voltage=PE/q (remember Joules/Coulomb= volt)
F=ILBsin? (?= angle btw. L and B)
W=qVoltage. (think C* J/C and C's cancel out)
V= 331 m/s + (.6 m/s°C)Temperature

49. Light intensity is proportional to..
F= (9/5)C+ 32
1.67*10?²7kg
R= ?L/A = (resistivity)(length of wire) / (cross sectional Area)
Intensity a Amplitude/ d²

50. Centripetal acceleration formula
Fb= Bperp-to-areaAcos? (Measures density of magnetic field lines that cross through an area)
A=v²/ r
Large/high
W=qVoltage. (think C* J/C and C's cancel out)