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At t=0 the current to a dc electric motor is reversed, resulting in an angular displacement...

At t=0 the current to a dc electric motor is reversed, resulting in an angular displacement of the motor shaft given by ?(t)=( 247 rad/s )t?( 19.7 rad/s2 )t^2?( 1.54 rad/s3 )t^3.

A) 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?

B) How fast was the motor shaft rotating at

t=0, when the current was reversed?

C) Calculate the average angular velocity for the time period from

t=0 to 4.2 seconds

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