When are objects in thermal equilibrium? * When they're the same size.
When they're touching.
When they're the same temperature.
When both objects' temperatures have changed by the same amount.

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.

In the 1980's, congress authorized the u. s. department of energy to build the wipp facility in the chicuahuan desert in new mexico. what is the purpose of wipp?

This is for my 8th grade science class, i really don’t understand. can someone me? , lol.