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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 |
Created by:
dkutasov
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