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In mathematics, a cubic plane curve is a plane algebraic curve C defined by a cubic equation (,,) = applied to homogeneous coordinates (::) for the projective plane; or the inhomogeneous version for the affine space determined by setting z = 1 in such an equation.
[1] The cubic inch and the cubic foot are used as units of volume in the United States, although the common SI units of volume, the liter, milliliter, and cubic meter, are also used, especially in manufacturing and high technology. One cubic inch is exactly 16.387 064 mL. One cubic foot is equal to exactly 1,728 cubic inches (28.32 L), as 12 3 ...
The parameter t can be eliminated easily giving the Cartesian equation 27 a y 2 = ( a − x ) ( 8 a + x ) 2 {\displaystyle 27ay^{2}=(a-x)(8a+x)^{2}} . If the curve is translated horizontally by 8 a and the signs of the variables are changed, the equations of the resulting right-opening curve are
1.51% (1 in 66) – (1 foot (0.3 m) per 1 chain (20 m)) New South Wales Government Railways, Australia, part of Main South line. 1.25% (1 in 80) – Wellington Bank, Somerset , UK 1.25% (1 in 80) – Rudgwick , UK ( West Sussex ) platform before regrading – too steep if a train is not provided with continuous brakes .
The factor–label method is the sequential application of conversion factors expressed as fractions and arranged so that any dimensional unit appearing in both the numerator and denominator of any of the fractions can be cancelled out until only the desired set of dimensional units is obtained.
is the angle between the slope line and the horizontal line, s is the slope distance measured between two points on the slope line, h is the height of the slope. C v = 2 L ∗ s i n 2 + A 2 {\displaystyle C_{v}=2L*sin^{2}+{\frac {A}{2}}}
The Darcy-Weisbach equation was difficult to use because the friction factor was difficult to estimate. [7] In 1906, Hazen and Williams provided an empirical formula that was easy to use. The general form of the equation relates the mean velocity of water in a pipe with the geometric properties of the pipe and the slope of the energy line.
A cubic equation with real coefficients can be solved geometrically using compass, straightedge, and an angle trisector if and only if it has three real roots. [30]: Thm. 1 A cubic equation can be solved by compass-and-straightedge construction (without trisector) if and only if it has a rational root.