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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 |