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Physics SAT II
Question | Answer |
---|---|
Amount of heat (Q) | Q=mc∆T |
Amount of heat (Q) during a phase transition | Q=mL |
Heat transfer and thermal expansion | ∆L=αLi∆T |
Velocity (root-mean-square) | √(3RT/M) |
Work (P and V) | W=P∆V (W is + when system does work on surroundings) |
Efficiency of heat engines | e=1-Qc/Qh or e=W/Qh |
Power | P=W/t=F*V |
Linear momentum (p) | p=mv (F=∆p/∆t) |
Impulse (J) | J=F∆t=∆p |
Elastic vs. Inelastic Collisions | Elastic collision = KE is conserved (momentum is always conserved) |
Center of Mass | xcm = (m1x1+m2x2+…+mnxn)/(m1+m2+…+mn) |
Torque | t=rFsinØ |
Angular Momentum (L) | L=rmv |
Kepler's Third Law | (T^2)/(a^3) (t=period and a=length of semimajor axis of orbit) |
Gravitational Force | F=(GMm)/(r^2) |
Gravitational Potential Energy (U) | U = -GMm/r |
Hooke's Law | Spring Force: F=-kx |
Elastic Potential Energy | U=(1/2)kx^2 |
Period of a spring | T=2π*√(m/k) |
Period of a pendulum | T=2π*√(L/g) |
Electric Force | F=kQq/(r^2) |
Electric Field (E) | E=kQ/(r^2)=F/q |
Electric Potential (V) | V=kQ/r |
Electric Potential Energy (U) | ∆U=-W=-qEr |
Capacitance (C) | C=Q/∆V=EoA/d |
Capacitors in parallel vs. in series | Cp=C+c 1/Cs=1/C+1/c |
Dialectrics | Increases the capacitance |
Current (I) | I=∆Q/∆t (Coulmb per second = Ampere) |
Resistance (R) | R=∆V/I (Volt/Ampere=ohm) |
Resistivity | R=ρL/A (L=length of wire and A=cross-sectional area) |
Energy and Power | P=IV=(I^2)R=(V^2)/R |
Magnetic Force | F=qvBsin(theta) where theta is the angle between v and B |
Magnetic Force on a Current-Carrying Wire | F=IlBsin(theta) |
Motional Emf | E=vBl |
Magnetic Flux | Magnetic Flux=BAcos(theta) where B=magnetic field and A=area |
Velocity of a wave | v=(wavelength)(frequency) |
Wave speed on a stretched string | v=√(Tension force/linear mass density) linear mass density=m/L |
Harmonic wavelengths (harmonic number) | wavelength=2L/n (n=harmonic number) |
Fundamental frequency | f=nv/2L |