solid mechanics

hi

i am having problems solving two solid mechanics problems... can anyone please help??? the problems are:

Question 4:

A 2380 Nm torque is applied to gear D due to input torque from the motor at A, as shown in figure 4. Shafts 1 and 2 are both solid steel, 44 mm in diameter and 600 mm long. Gear B has a diameter of 250 mm and gear C has a diameter of 350 mm. The shear modulus G for steel is 80GN/m^2

Find out:

(a)    the maximum stress in shaft 2

I have a problem in my research that involves a platinum electrode which will form bubbles of hydrogen gas.  Bubbles sticking to the electrode is expected to be a problem, and one method of dealing with this is to induce resonant vibrations in the electrode.  These vibrations can be excited by running an alternating current through the electrode, which produces physical forces through electromagnetic interactions.

Project Description:

Although this is a class in solid mechanics, I chose a project which focuses on fluid dynamics. I did this because I think this project will be very educational with respect to the Finite Element Analysis and mechanics in general.

Please see the attached file for details.