The rotor of a helicopter is gaining angular speed with constant angular acceleration. At t = 0 it is rotating at 1.25 rad/s. From t = 0 to t = 2.00 s, the rotor rotates through 8.00 rad. (a) What is the angular acceleration of the rotor? (b) Through what angle (in radians) does the rotor rotate from t = 0 to t = 4.00 s?

The rotor of a helicopter is gaining angular speed with constant angular acceleration. At t = 0 it is rotating at 1.25 rad/s. From t = 0 to t = 2.00 s, the rotor rotates through 8.00 rad. (a) What is the angular acceleration of the rotor? (b) Through what angle (in radians) does the rotor rotate from t = 0 to t = 4.00 s?

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Question

The rotor of a helicopter is gaining angular speed with constant
angular acceleration. At t = 0 it is rotating at 1.25 rad/s. From
t = 0 to t = 2.00 s, the rotor rotates through 8.00 rad. (a) What is the
angular acceleration of the rotor? (b) Through what angle (in radians)
does the rotor rotate from t = 0 to t = 4.00 s?

Definition Definition Rate of change of angular velocity. Angular acceleration indicates how fast the angular velocity changes over time. It is a vector quantity and has both magnitude and direction. Magnitude is represented by the length of the vector and direction is represented by the right-hand thumb rule. An angular acceleration vector will be always perpendicular to the plane of rotation. Angular acceleration is generally denoted by the Greek letter α and its SI unit is rad/s 2 .

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