An object is rotating with an angular acceleration given by $\alpha = c + d t ^ { 2 }$ , where $\surd$ is in radians/s², t is in seconds, c = -3.0 rad/s², and d = 0.40 rad/s⁴. At t = 2.0 s the angular acceleration of the object is A) -2.2 rad/s². B) -1.4 rad/s². C) 3.8 rad/s². D) 4.6 rad/s².

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Quizplus · Accepted Answer

The angular acceleration at t = 2.0 s is calculated by substituting t into the equation: $\alpha = c + d t^2 = -3.0 + 0.40 \times (2.0)^2 = -3.0 + 1.6 = -1.4$ rad/s².

An Object Is Rotating with an Angular Acceleration Given By \alpha