I think you're trying to give the definition of a planet.
The Moon. It is a spherical object in space that reflects sunlight.
To use a spherometer, place it gently on the spherical surface to be measured and adjust the central screw until the two outer legs make contact with the surface. The reading on the scale will give you the curvature or depth of the spherical surface at the point of contact.
Because that's how physics works. If you asked a more specific question, we could probably give a more specific answer, but I'm really tired of trying to guess what these incredibly vague questions mean.
Rainbows are circular in shape, with the top part of the circle often hidden by the horizon. This can give the appearance of a frown shape. The lower part of the rainbow arcs upward due to the refraction and dispersion of sunlight through water droplets in the atmosphere.
The rectangular shape avoids the curvature of light where as the spherical shape will bend it and give an inaccurate reading of absorption.
The round (spherical) shape of a planet comes about through the force of gravity, not through wind, but the rotation does have an effect on its shape. Mass is related to gravity, the more massive an object is the bigger the force of gravity at its surface. If an object is around 700-1000km in diameter (roughly) then it will have enough gravity for it to shape itself into a ball shape, overcoming the internal forces that would otherwise give it an irregular shape. A object (like a moon, dwarf planet or planet) has to be large enough and massive enough to 'pull' itself into a spherical shape. The spin of the object may cause the spherical shape to become squashed, if it is fast enough, as the centripetal forces at the equator will stretch it out somewhat.
the surface tension of water is responsible for spherical shape of a drop.
As with all planets it is an oblate spheroid
The earth's shape (almost spherical) has absolutely no influence on the seasons, which are associated with the inclination of its axis relative to its orbital plane.
This is an outstanding question. On the atomic and molecular scale rotation tends to determine the spherical shape. Molecules do tend to organize in a spherical manner on a large scale as rain drops. However, should the raindrop grow too large as it falls neck instability tends to give it a barbell shape in which it will break into more than one sphere. But besides rotation for planets they tend to "organize" around a center of mass and gravitational forces are at work here. I welcome additional comments on this subject.
s2o32-to give s4o62-
the shape of the earth is not flat. it has a spherical shape. its slightly flattened at the poles to give a nearly spherical shape hence; the earth's shape is better described as a geoid which means the earth's shape
The reason behind the spherical design is due to extremely high pressures in deep-sea levels. A spherical design forces the water to press down on an equally shaped surface with no dents or flat surfaces to give the pressures a "foothold" in crushing the submersible.
Yes, balancing the forces acting on an object involves ensuring that the sum of all forces is zero, which means there is no net force acting on the object. This equilibrium condition results in the object either remaining at rest or moving at a constant velocity.
Too small. (To be even a dwarf planet you must have sufficient mass to give yourself a spherical shape.)
As we all know, apples have a rather spherical shape (give or take a few curves). The fact of the matter is that it has been proven that foods with a more circular shape agree with your digestive system. Yes, that's right, Easter is coming upon, so be guilt free next time you eat an easter egg, due to its' spherical shape. No calories involved. In fact, no matter the food, its' shape will improve your health. I suggest molding all of your foods into a spherical shape, and watch your health improve dramatically.