If you have a solid and a liquid at room temperature, what conclusion can you draw about the relative strenghts of their interatomic forces?
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Suppose you accidentally dropped your aluminum sample into a container of liquid nitrogen. If the sample was at room temperature (around 22 degrees Celsius), how much liquid nitrogen do you think would boil away as the aluminum sample cools to -196 degrees Celsius?
Imagine that you could take 1 mole of protons and one mole of electrons in the previous question and separate them by a distance of r=1m. What would be the force of attraction F between the two charges? Compare the magnitude of this force to the sort of ~1000 N forces that you calculated in the first quarter for conventional mechanical systems. Does this really tell you something about the relative strength of electrostatic forces and gravitational forces?
What can you say about the velocity of a moving body than is in dynamic equilibrium? Draw a sketch of such a body using clearly labeled arrows to represent all external forces on the body.ย