Posted by **Lizzy** on Tuesday, October 30, 2012 at 1:24pm.

At t=0 the current to a dc electric motor is reversed, resulting in an angular displacement of the motor shaft given by

theta(t)= 258t - 20.4t^2 - 1.47t^3

How many revolutions does the motor shaft turn through between the time when the current is reversed and the instant when the angular velocity is zero?

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