Second Law of Motion

_{The net external force on an object is equal to the time derivative of its linear momentum}

Second Law of Planetary Motion

_{During equal intervals of time, a line connecting the Sun and a planet in orbit therearound sweeps out equal areas}

Second Law of Inheritance

_{Separate genes for separate traits are passed independent of one another from one generation to the next}

Second Law of Thermodynamics

_{The entropy of an insolated system never decreases}

Second Law of Electrolysis

_{For a given quantity of D.C. current, the mass of an elemental material altered at an electrode is directly proportional to the element's equivalent weight}

Second Law of Indices

_{The value of a given base raised to one power divided by that same base raised to a second power is the equal base raised to the difference of the two powers}

Second Law of Black Hole Mechanics

_{For perturbations of stationary black holes, dE = κ/(8π)*dA + ΩdJ + ϕdQ where E is the energy, κ is the surface gravity, A is the event horizon, Ω is the angular velocity, J is the angular momentum, ϕ is the electrostatic potential, and Q is the electrical charge}

Second Law of Circuits

_{The directed sum of the electric potential differences around any closed network is zero}

[answer]'s Second Law

_{The internal energy of an ideal gas depends only on its temperature and not on its pressure nor its volume}

[answer]'s Second Law

_{An economic agent will allocate his or her expenditures such that the ratio of the marginal utility of each good or service to its price is equal to that ratio for every other good or service}

Second Law of Robotics

_{A robot must obey the orders given to it by a human, except in cases when such orders would conflict with the First Law of Robotics}

Second Law of Probability

_{The probability of independent chance events occurring together is the product of the probabilities of the separate events}

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