(kg / km) = D ^ 2 * 0.7854 * g * n * K1 * K2 * C / what does 2 after diameter power mean

(kg / km) = D ^ 2 * 0.7854 * g * n * K1 * K2 * C / what does 2 after diameter power mean

The following 2 is the square of D, or the second power of D, or DXD

It is known that f (x) = 3f (x) when x > 3
It is known that when x > 3, f (3x) = 3f (x) f (3 ^ n + 2) = kn, which is the nth power of 3 + 2

If x > 3, f (x) = 3f (x)
Is f (3 ^ n + 2) = kn the nth power of 3 + 2 or the (n + 2) power of 3?

If points a (2, K1), B (3, K2), C (4, K3) are on the parabola y = - (x + 1) - 5, then
Compare the size of K1 K2 K3

Is it y = - (x + 1) ^ 2-5?
The opening is downward, and the axis of symmetry x = - 1
So when x = - 1, y has a maximum
The farther a point is away from the symmetry, the smaller the function value is
So the abscissa of ABC is 2, 3, 4, which is far away from x = - 1
So K1 > K2 > K3

Why is the relationship between the line y = K1X + B1 and y = k2x + B2? When K1 times K2 = - 1, the two lines are perpendicular to each other

This is a theorem. To put it simply, the coefficients K1 and K2 represent the tangent of a straight line. When the included angle is a right angle, the tangent is exactly the negative reciprocal (the quadrant determines the positive and negative)