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A Fast Falling Weight Deflectometer (FFWD) is a FWD with pneumatic or electric actuators rather than hydraulic, making the mechanics several times faster. A Heavy Weight Deflectometer (HWD) is a falling weight deflectometer that has higher loads (typically 300 kN to 600 kN), used primarily for testing airport pavements.
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weight of prisoner [2] 1892 drop (ft & inches) Ft.lbs energy developed 1913 drop (feet & inches) Ft.lbs energy developed 105 and under: 8'0" 840-- 110
The limit of this formula, as α goes to 90°, gives the maximum weight of a pendant drop for a liquid with a given surface tension, . m g = π d γ {\displaystyle \,mg=\pi d\gamma } This relationship is the basis of a convenient method of measuring surface tension, commonly used in the petroleum industry.
Folklore, too, topped the chart, making Swift the first woman to have two No. 1 albums in the same year. And four years on, Swifties clearly aren’t bored of classic songs like “Champagne ...
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The stalagmometric method was improved by S. V. Chichkanov and colleagues, [2] who measured the weight of a fixed number of drops rather than counting the drops. This method for determining the surface tension may be more precise than the original method, especially for fluids whose surface is highly active.