Final answer:
A full rotation or revolution is 360 degrees or 2π radians, while a half rotation is 180 degrees. The relationship between radians and degrees is that 1 radian equals approximately 57.3 degrees.
Step-by-step explanation:
A full rotation or revolution is 360 degrees, whereas a half rotation is 180 degrees. In terms of radians, which are a dimensionless unit defined as the ratio of two distances (radius and arc length), one revolution is equal to 2π radians. The circumference of a circle, which is the arc length for one complete revolution, is calculated using the formula 2πr, where 'r' represents the radius of the circle. Therefore, when we convert between radians and degrees, we use the fact that 1 radian is approximately 57.3 degrees.
Angular velocity is a concept that describes the rate of change of an angle and is particularly useful in physics. When discussing the rotation of celestial bodies, such as planets, 'R' might stand for retrograde rotation, which is rotation in the opposite direction to most other objects in the solar system.