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  2. Reorder point - Wikipedia

    en.wikipedia.org/wiki/Reorder_point

    Reorder level = Average daily usage rate × Lead time in days = 50 units per day × 7 days = 350 units. When the inventory level reaches 350 units an order should be placed for material. By the time the inventory level reaches zero towards the end of the seventh day from placing the order materials will reach and there is no cause for concern.

  3. Reach (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Reach_(mathematics)

    Shapes that have reach infinity include a single point, a straight line, a full square, and; any convex set. The graph of ƒ(x) = |x| has reach zero.

  4. Kardashev scale - Wikipedia

    en.wikipedia.org/wiki/Kardashev_scale

    Projection of the Kardashev scale to 2040 based on data from the International Energy Agency World Energy Outlook. Kardashev presented for the first time a classification of civilizations according to the level of the rate of their energy consumption, or ability to harness power, in an article entitled Transmission of Information by Extraterrestrial Civilizations, published in 1964 first in ...

  5. Absolute zero - Wikipedia

    en.wikipedia.org/wiki/Absolute_zero

    Absolute zero is the lowest limit of the thermodynamic temperature scale; a state at which the enthalpy and entropy of a cooled ideal gas reach their minimum value. The fundamental particles of nature have minimum vibrational motion, retaining only quantum mechanical, zero-point energy -induced particle motion.

  6. Terminal velocity - Wikipedia

    en.wikipedia.org/wiki/Terminal_velocity

    When the buoyancy effects are taken into account, an object falling through a fluid under its own weight can reach a terminal velocity (settling velocity) if the net force acting on the object becomes zero. When the terminal velocity is reached the weight of the object is exactly balanced by the upward buoyancy force and drag force. That is

  7. Reach (geography) - Wikipedia

    en.wikipedia.org/wiki/Reach_(geography)

    A reach may be an expanse, or widening, of a stream or river channel. This commonly occurs after the river or stream is dammed. A reach is similar to an arm, though an arm may bend and thus have multiple reaches. The term "reach" can also refer to a level stretch, as between river rapids or locks in a canal.

  8. Steady state - Wikipedia

    en.wikipedia.org/wiki/Steady_state

    One of the simplest examples of such a system is the case of a bathtub with the tap open but without the bottom plug: [dubious – discuss] after a certain time the water flows in and out at the same rate, so the water level (the state variable being Volume) stabilizes and the system is at steady state. Of course the Volume stabilizing inside ...

  9. Vertical datum - Wikipedia

    en.wikipedia.org/wiki/Vertical_datum

    Vertical datums in Europe. In geodesy, surveying, hydrography and navigation, vertical datum or altimetric datum is a reference coordinate surface used for vertical positions, such as the elevations of Earth-bound features (terrain, bathymetry, water level, and built structures) and altitudes of satellite orbits and in aviation.