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The Angular velocity is defined as the angle swept by the radius per unit time.
Earth's true angular velocity, ÏEarth, is equal to 15.04108°/mean solar hour (360°/23 hours 56 minutes 4 seconds)
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The acceleration towards the center of the circle is known as centripetal acceleration.
An object traveling in a circular path may have a constant speed, but it is not traveling in a straight line. The velocity and direction are changing as velocity is a vector. A change in velocity means the object is accelerating.
Centripetal force provides the centripetal acceleration.