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 Foucault gyrocompass is a one-axis astatic gyroscope whose axis is movable in the horizontal plane. Because of the gyroscopic moment generated by the earthâs rotation, its axis tends to coincide with the plane of the meridian.hen the axis AB of the rotor is not in the plane of the meridian (when it is deflected to the east or west), it will deviate from the plane of the horizon because of the earthâs rotation, since the rotor, in accordance with the properties of a free gyroscope, tends to maintain its orientation relative to the stars.