Concrete is the most common artificial composite material of all and typically consists of loose stones (aggregate) held with a matrix of cement. Concrete is a very robust material, much more robust than cement, and will not compress or shatter even under quite a large compressive force.
2) Y-axis contains absolute brightness Why do astronomers use the H-R Diagram? Astronomers use H-R Diagrams to classify stars and to understand how stars change over time.
The sum of its focal radii has 2 a and its equation is. The major axis is on the x-axis. If the foci on the ellipse are on the y-axis, then the focal points are (0, Â± c), and the formula is. The major axis is on the y-axis. The x-intercepts are (Â± b, 0) and the y-intercepts are (0, Â± a).he major axis of the ellipse is the chord that passes through its foci and has its endpoints on the ellipse. The minor axis of the ellipse is the chord that contains the center of the ellipse, has its endpoints on the ellipse and is perpendicular to the major axis. An ellipse has a quadratic equation in two variables.