A lathe is capable of spinning a cylindrical solid aluminium bar of radius 2.4 cm and length 75 cm up to a the required angular speed of 12000 rad s- in just 1.3 s. (PA 2700 kg m, Pwood 700 kg m1 What torque is the fathe capable of exerting? 1- 4 4N'm (2.s.f) ( Submit Answer Incorrect. Tries 3/5 Previous Tries

I'm trying to solve this Statics exercise, but I'm getting the wrong answer in every approach I made. How can I solve it?

I have a 52100 steel hollow shaft, that will be threaded into a 1 inch thick plate of aluminum 7075. The shaft is 960 mm in length, 40 mm OD and 20 mm ID. The threaded end of the shaft is M30X3.5. What would be the recommended torque for the shaft, with the dissimilar metals. I’m expecting a range between 100-280 ft-lbs but can justify it.