Posted by Lizzy on .
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?

College Physics 
Lizzy,
I figured it out! I wasn't putting the t at omega=0 in the first equation in properly before converting from radians to revolutions!