Ice floats in water at 0°c. why is this an example of physical equilibrium?

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This is the best answer i could possibly think of i hope it helps you out!

As the water cools freezes into ice, it becomes less dense. On the other hand, most substances are most dense in their solid state than in their liquid state. For an object to be able to float, it has to displace a weight of fluid equal to its own weight. The heavier water displaces the lighter ice, so ice floats to the top.

d) the number of neutrons plus the number of protons

in physics zero. in muscle fatigue could be high