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  2. Hydraulic jumps in rectangular channels - Wikipedia

    en.wikipedia.org/wiki/Hydraulic_Jumps_in...

    Increasing the incoming flow rate (from q = 10 ft 2 /s to 30 ft 2 /s in Figure 7) will result in an increase in the supercritical approach depth and a decrease in the subcritical depth post-jump. This can be seen in Figure 6 by the decrease in depth from y 1,q=30 to y 1,q=10 and the increase in depth between y 2,q=30 and y 2,q=10 .

  3. List of unusual units of measurement - Wikipedia

    en.wikipedia.org/wiki/List_of_unusual_units_of...

    In most US cities, a city block is between 1 ⁄ 16 and 1 ⁄ 8 mi (100 and 200 m). In Manhattan, the measurement "block" usually refers to a north–south block, which is 1 ⁄ 20 mi (80 m). Sometimes people living in places (like Manhattan) with a regularly spaced street grid will speak of long blocks and short blocks.

  4. Poly(methyl methacrylate) - Wikipedia

    en.wikipedia.org/wiki/Poly(methyl_methacrylate)

    A disadvantage of this bone cement is that it heats up to 82.5 °C (180.5 °F) while setting that may cause thermal necrosis of neighboring tissue. A careful balance of initiators and monomers is needed to reduce the rate of polymerization, and thus the heat generated.

  5. Spar buoy - Wikipedia

    en.wikipedia.org/wiki/Spar_buoy

    A diagram of an anchored spar buoy. A spar buoy is a tall, thin buoy that floats upright in the water and is characterized by a small water plane area and a large mass. . Because they tend to be stable ocean platforms, spar buoys are popular for making oceanographic measu

  6. Glossary of construction cost estimating - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_construction...

    Example: selected rate = 0.104, reference rate = 0.125, productivity factor = 0.125/0.104 = 1.20. A productivity factor is often used to adjust a set of standard or normal (norm) production or man-hour rates to a set of rates for a specific project, location, or set of working conditions (see Labor Productivity Factor). [ 15 ]

  7. Horsepower - Wikipedia

    en.wikipedia.org/wiki/Horsepower

    Citing measurements made at the 1926 Iowa State Fair, they reported that the peak power over a few seconds has been measured to be as high as 14.88 hp (11.10 kW) [12] and also observed that for sustained activity, a work rate of about 1 hp (0.75 kW) per horse is consistent with agricultural advice from both the 19th and 20th centuries and also ...

  8. Mid-ocean ridge - Wikipedia

    en.wikipedia.org/wiki/Mid-ocean_ridge

    Mid-ocean ridge cross-section (cut-away view) A mid-ocean ridge (MOR) is a seafloor mountain system formed by plate tectonics.It typically has a depth of about 2,600 meters (8,500 ft) and rises about 2,000 meters (6,600 ft) above the deepest portion of an ocean basin.

  9. History of United States postage rates - Wikipedia

    en.wikipedia.org/wiki/History_of_United_States...

    There were double and triple rates as a letter's size increased. Ship fees were also added (i.e., mail to Hawaii). The ship fee, including the ship rate on letters for delivery at the port of entry, were on a per letter basis, rather than weight. The United States issued its first postage stamps in 1847.