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Encyclopedia > Constant Angular Velocity

Constant Angular Velocity (CAV) refers to how information is written to or read from a rotating data disk. A typical example can be seen in one of the differences between an LP record and a compact audio disc (CD). With an LP, the disc always spins at the same angular rate (CAV), so the surface of the record groove passes the needle at slower linear rate as the needle moves toward the center of the disc. Whereas, with a CD, the motor speed decreases as the read head moves away from the center to keep the disc moving past the read head at a constant linear velocity (CLV).


  Results from FactBites:
 
Angular velocity - Wikipedia, the free encyclopedia (1002 words)
Angular velocity is the vector physical quantity that represents the rotation of a spinning body.
The magnitude of the angular velocity is the angular speed (or angular frequency) and is denoted by ω.
With constant angular acceleration, the angular velocity conforms to the rotational equations of motion, equivalent to the standard linear equations of motion under constant linear acceleration.
Rotational Quantities (394 words)
Angular velocity is the rate of change of angular displacement and angular acceleration is the rate of change of angular velocity.
The rotation equations represent a complete set of equations for constant angular acceleration rotations, but in certain types of problems, intermediate results must be calculated before proceeding to the final calculation.
In the example calculation, the time, initial angular velocity, and displacement were considered given (primary) unless they were being calculated (e.g., in calculating a).
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