Question: If all frictional effects are neglected, the expression for the angular acceleration of the simple pendulum is = g/l cos , where g is

If all frictional effects are neglected, the expression for the angular acceleration of the simple pendulum is θ¨ = g/l cos θ, where g is the acceleration of gravity and l is the length of the rod OA. If the pendulum has a clockwise angular velocity θ˙ = 2 rad/s when θ = 0 at t = 0, determine the time t′ at which the pendulum passes the vertical position θ = 90°. The pendulum length is l = 0.6 m. Also plot the time t versus the angle θ.

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