A period on the periodic table is a horizontal row. The atoms in this row show a trend in their width, and in the amount of work needed to make them an ion, among the fe â¦ w other similarities.
The x-axis and y-axis Remembered! The x-axis and y-axis are two lines that create the coordinate plane. The x-axis is a horizontal line and the y-axis is a vertical line. I'm sure you've heard that a million times, but it might hard for you to remember which one is which. Here is a little trick to help you remember...
The mid-plane of the laminate lies in the XY-plane so that half its thickness is above the plane and half is below. Hence, the XY-plane is a plane of symmetry and II xz yz 0 o Bodies of revolution have two planes of symmetry. For the configuration shown, the XZ and YZ planes are planes of symmetry. Hence, all products of inertia are zero about the X, Y, and Z axes. o Products of inertia are found either by measurement or calculation. Calculations are based on direct integration or on the â body build-up â technique.