1) Flexible steel wire shaft encased in a stationary tube that fits closely enough to impose a frictional torque of 3 N-

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1) Flexible steel wire shaft encased in a stationary tube that
fits closely enough to impose a frictional torque of 3 N-m/m. the
wire has a diameter of 12 mm and the induced stress must not exceed
145 MN/m^2. What will be the angular rotation of one end with
respect to the other end?
answer. 136.83 deg
2) A steel shaft 1.75 inches in diameter transmits 40 Hp at
1800 rpm. Assuming a modulus of rigidity of 12 x 10^6 psi, find the
torsional deflection of the shaft in degrees per foot length.
answer. 0.0073