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MCAT Physics JBrosch
Term | Definition |
---|---|
Ohm's Law | V= IR |
Current | I= Q/t (movement of positive charge; created by voltage) |
Power in a circuit = ? | I^2R = IV = (V^2)/R = Work/time |
Work for charges? | - change in V * q |
Voltage? | Change in Potential; creates current |
Potential Voltage? | kq/r |
Work/ Energy? | W = change in KE = NEGATIVE change in PE (Joules) |
Electric Force? | kqQ/(r^2) OR qE (just add extra q to numerator) |
Electric Field? | kq/(r^2) OR F/q (divide force by q to cancel out extra q in numerator) |
Work of Electric Field? | Fd = qEd |
Resistance | rho (L/A) |
Capacitance | permittivity of free space (A/d) |
Potential across the capacitor | U = (q^2)/2C |
Electric field inside conductor | Zero |
Coulomb | 9 x 10^9 (Nm^2)/(C^2) |
2 pi rads | 360 degrees |
1 rad | 57.3 degrees |
An induced current... | OPPOSES the magnetic field |
Centripetal acceleration | (v^2)/r = omega^2*r |
Parallel acceleration (rotational) | alpha * r |
Escape velocity | (2gr)^(1/2) |
Work (rotational) | torque * theta |
Force (rotational) | torque/ r |
Torque | F*r*sin(theta) OR F*"lever arm" |
Inertia | resistance to movement |
momentum | mass*velocity |
change in momentum | impulse = F*(change in time) |
KE | mv^2/2 |
PE (spring); Hooke's Law | kx^2/2 |
Force of spring | -kx |
frequency | 1/T |
T pendulum | 2pi(L/g)^1/2 |
T spring | 2pi(m/k)^1/2 |
Stress | force/ area |
Strain | change in length/ length |
F buoyant | V fluid * density fluid* g |
Doppler | F apparent = original V sound/ (V sound - V source) |