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# Physics SAT II

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