Diameter.
It is called the Diameter.
Seems to me that either of the following could settle that issue: Necessary and sufficient: -- The object is in motion AND there exists a point from which the distance to the object is constant. Sufficient but not necessary: -- The component of the object's position that is parallel to some straight line is proportional to the cosine of (time + a constant).
clatrive
Picture the center of a circle. The distance from it to the edge of the circle is the radius. The fixed distance from the center to the edge of any part of the circle is radial movement. So radial movement is the circular distance an object can move from a fixed point.
Centripetal
No, the diameter is the distance across a circle passing through its center. The distance around a circle is called the circumference.
The centripetal acceleration of an object in uniform circular motion is directed towards the center of the circular path and is perpendicular to the object's velocity. It is responsible for changing the direction of the object's velocity, keeping it moving in a circular path.
The direction of the force acting on an object moving radially inward towards the center of a circular path is towards the center of the circle.
When an object moves in a circular path, it accelerates toward the center of the circle due to the centripetal acceleration. This acceleration is necessary to keep the object moving in a curved path rather than in a straight line.
The acceleration of an object in circular motion is directed towards the center of the circle. This centripetal acceleration is responsible for constantly changing the object's direction, while the object's velocity remains tangent to its circular path.
A sphere is a 3D object that is circular in shape. It is perfectly round like a ball, with every point on its surface equidistant from its center.
clatrive