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A cube of ice is suspended in vacuum inside a hall under gravity-free conditions. As the ice melts, the resulting water
- keeps its original cubical shape
- loses its cubical shape
- drops to the floor of the hall
- rises toward the ceiling
Correct answer: loses its cubical shape
Solution
In a gravity-free environment there is no weight, so the molten water is shaped only by surface tension, which tends to minimize surface area. The cube collapses into a spherical droplet, so it changes its cubical shape; it neither falls nor flies.
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