A 200 -VDC shunt motor with an armature resistance of $0.1 \Omega$ and a field resistance of $100 \Omega$ draws a line current of 5 A when running with no load at $955 \mathrm{r} / \mathrm{min}$. Determine the motor speed, the motor efficiency, the total losses (i.e., rotational and $I^2 R$ losses), and the load torque $T_{\mathrm{sh}}$ that will result when the motor draws 40 A from the line. Assume rotational power losses are proportional to the square of shaft speed.