The thermal contact conductance at the interface of two 1-cm-thick copper plates is measured to be 18,000 w/m2 · c. determine the thickness of the copper plate whose thermal resistance is equal to the thermal resistance of the interface between the plates.

your answer would be fusion

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.

the rearrangement of particles in a physical change. hope this