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 distance b of the foci and the constant sum s determine the shape of the t-ellipse like the usual ellipse. 1 F 2. There is only one row in the case s=b=6 with the foci at the ends. Explanation: For the left angular point there is the equation s=2x+b or s-b=2x or s-b is an even number.