305 Minimum Diameter of Steel Shaft With Allowable Angle of Twist

Problem 305
What is the minimum diameter of a solid steel shaft that will not twist through more than 3° in a 6-m length when subjected to a torque of 12 kN·m? What maximum shearing stress is developed? Use G = 83 GPa.
 

Solution 305

 

Comments

Why is it "1000³"?