Question

At t=0 the current to a dc electric motor is reversed, resulting in an angular displacement of the motor shaft given by θ(t)=( 244 rad/s )t−( 19.5 rad/s2 )t2−( 1.60 rad/s3 )t3. Part A At what time is the angular velocity of the motor shaft zero? tt = nothing s Request Answer Part B Calculate the angular acceleration at the instant that the motor shaft has zero angular velocity. αα = nothing rad/s2 Request Answer Part C 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? NN = nothing rev Request Answer Part D How fast was the motor shaft rotating at t=0, when the current was reversed? ωω = nothing rad/s Request Answer Part E Calculate the average angular velocity for the time period from t=0 to the time calculated in part A. ωavω a v = nothing rad/s Request Answer Provide Feedback

Answer 1