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Calculate the value of the angular acceleration of the motor using the given data: J = .01 kg-m^2, load torque= 790 N-m, motor torque= 169 N-m.

(a) -62100 rad/s^2

(b) -62456 rad/s^2

(c) -34056 rad/s^2

(d) -44780 rad/s^2

The question was asked in an interview for internship.

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Right choice is (a) -62100 rad/s^2

The explanation is: Using the dynamic equation of motor J*(angular acceleration) = Motor torque – Load torque: .01*(angular acceleration) = 169-790=-621, angular acceleration=-62100 rad/s^2.The motor will decelerate and will fail to start.

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