19. What is the total lineal distance, in feet, along the curb shown? Round off

The diameter of the shaft is 80.5 mm.

Explanation:

Torsion equation is applied for the diameter of the solid shaft.

Step1

Given:

Power of the shaft is 100 kw.

Revolution per minute is 160 RPM.

Allowable shear stress is 70 Mpa.

Maximum torque is 20% more than the mean torque.  

Step2

Mean torque is calculated as follows:

T=5968.31 N-m

Step3

Maximum torque is calculated as follows:

T_{max}=7161.97 N-m

Step4

Apply torsional equation for diameter of shaft as follows:

d=0.0805 m

or,

d=80.5 mm

Thus, the diameter of the shaft is 80.5 mm.