In this image of Earth and the Moon from the Sim, what does the circle around Earth represent?

The rigid beam is supported by the three suspender bars. bars ab and ef are made of aluminum and bar cd is made of steel. if each bar has a cross-sectional area of 450 mm2, determine the maximum value of p if the allowable stress is (σallow)st = 200 mpa for the steel and ( σallow)al = 150 mpa for the aluminum. est = 200 gpa and eal = 70 gpa.

Atomic nuclei of almost all elements consist of

The frequencies refer to the sample data collected from a population of interest when performing a hypothesis test comparing two or more population proportions.