#2
Classical Mechanics
Level
1
The raindrops are spherical due to
gravity of the spherical earth
surface tension
viscosity of the raindrops
atmospheric friction due to air molecules
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1 solution
Now, for a given volume the sphere has the least surface area(You can prove this by concept of maxima/minima. I can provide the proof if you'll want), therefore raindrops acquire spherical shape.
NOTE: The real shape of raindrops are an approximate OVAL due to the effect of gravity. But for very small droplets force of gravity is negligibly small & we can consider their shape as being spherical ideally.