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Beaumont St. Louis and San Francisco Railroad Water Tank (1875, restored 2012), Beaumont, Kansas, US. Although the use of elevated water storage tanks has existed since ancient times in various forms, the modern use of water towers for pressurized public water systems developed during the mid-19th century, as steam-pumping became more common, and better pipes that could handle higher pressures ...
The number π (/ p aɪ / ⓘ; spelled out as "pi") is a mathematical constant, approximately equal to 3.14159, that is the ratio of a circle's circumference to its diameter.It appears in many formulae across mathematics and physics, and some of these formulae are commonly used for defining π, to avoid relying on the definition of the length of a curve.
The time to reach the finishing line is longer for objects with a greater moment of inertia. ( OGV version ) The moment of inertia about an axis of a body is calculated by summing m r 2 {\displaystyle mr^{2}} for every particle in the body, where r {\displaystyle r} is the perpendicular distance to the specified axis.
the relationship between square feet and square inches is 1 square foot = 144 square inches, where 144 = 12 2 = 12 × 12. Similarly: 1 square yard = 9 square feet; 1 square mile = 3,097,600 square yards = 27,878,400 square feet; In addition, conversion factors include: 1 square inch = 6.4516 square centimetres; 1 square foot = 0.092 903 04 ...
Let X be the quadric cone of dimension 2, defined by the equation xy = z 2 in affine 3-space over a field. Then the line D in X defined by x = z = 0 is not principal on X near the origin. Note that D can be defined as a set by one equation on X , namely x = 0; but the function x on X vanishes to order 2 along D , and so we only find that 2 D is ...
Exerting 4 times the force over a fixed distance produces 4 times as much work. At twice the speed, the work (resulting in displacement over a fixed distance) is done twice as fast. Since power is the rate of doing work, 4 times the work done in half the time requires 8 times the power.
Robotics: self-navigating, autonomous robots using GPS sensors, [137] which calculate latitude, longitude, time, speed, and heading. Sport: used in football and rugby for the control and analysis of the training load. [138] Surveying: surveyors use absolute locations to make maps and determine property boundaries.
Also ship's magazine. The ammunition storage area aboard a warship. magnetic bearing An absolute bearing using magnetic north. magnetic north The direction towards the North Magnetic Pole. Varies slowly over time. maiden voyage The first voyage of a ship in its intended role, i.e. excluding trial trips. Maierform bow A V-shaped bow introduced in the late 1920s which allowed a ship to maintain ...