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  2. Two-second rule - Wikipedia

    en.wikipedia.org/wiki/Two-second_rule

    The three second rule is a time for the defensive driver to judge the minimum safe trailing distance to help avoid collisions under ideal driving conditions. The red car's driver picks a tree to judge a two-second safety buffer. The two-second rule is a rule of thumb by which a driver may maintain a safe trailing distance at any speed.

  3. Helicopter height–velocity diagram - Wikipedia

    en.wikipedia.org/wiki/Helicopter_height...

    The FAA states "The height–velocity diagram or H/V curve is a graph charting the safe/unsafe flight profiles relevant to a specific helicopter. As operation outside the safe area of the chart can be fatal in the event of a power or transmission failure it is sometimes referred to as the dead man's curve ."

  4. Mean free time - Wikipedia

    en.wikipedia.org/wiki/Mean_free_time

    The mean free time for a molecule in a fluid is the average time between collisions. The mean free path of the molecule is the product of the average speed and the mean free time. [1] These concepts are used in the kinetic theory of gases to compute transport coefficients such as the viscosity. [2] In a gas the mean free path may be much larger ...

  5. Comoving and proper distances - Wikipedia

    en.wikipedia.org/wiki/Comoving_and_proper_distances

    The x-axis is distance, in billions of light years; the y-axis is time, in billions of years since the Big Bang. This is the same model as in the earlier figure, with dark energy and an event horizon. Cosmological time is identical to locally measured time for an observer at a fixed comoving spatial position, that is, in the local comoving ...

  6. First Time Budgeting? Avoid Making These 6 Mistakes - AOL

    www.aol.com/first-time-budgeting-avoid-making...

    You're never too old, or too young, to start and follow a budget. Amy Maliga, financial educator at Take Charge America, said following a budget is the cornerstone of effective money management. A...

  7. Assured clear distance ahead - Wikipedia

    en.wikipedia.org/wiki/Assured_Clear_Distance_Ahead

    The time to traverse your stopping distance at travel speed should not be confused with the braking time to come to a full stop, which is a number nearly twice this value ( t= ⁠ v / μ g ⁠ +t ptr). As one is continually slowing down while braking, it will naturally take longer to get to the stopping limit.

  8. Zero crossing - Wikipedia

    en.wikipedia.org/wiki/Zero_crossing

    A zero-crossing in a line graph of a waveform representing voltage over time. A zero-crossing is a point where the sign of a mathematical function changes (e.g. from positive to negative), represented by an intercept of the axis (zero value) in the graph of the function.

  9. Self-avoiding walk - Wikipedia

    en.wikipedia.org/wiki/Self-avoiding_walk

    Self-avoiding walks have also been studied in the context of network theory. [7] In this context, it is customary to treat the SAW as a dynamical process, such that in every time-step a walker randomly hops between neighboring nodes of the network.