What element do most of the polyatomic ions have in the formula?

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.

Science and technology are interdependent. advances in one lead to advances in the other. give an example of this phenomenon.

Gordon is going for a run through the park, but it is cold outside. the low outside temperature could affect his personal safety.