No, that's where I'm stuck...I am on the right track though with my assuming I need the moment of inertia?
I could guess that I calculate the "I" for each of the smaller objects then take the average?
What I have so far is
w = 50rpm = (50x2pi)/60 = 5.23 rad/s
w = wo+at
a=(5.23-0)/5 = 1.046rad/s^2
T=mr^2a
T=68x.05x1.046 0.17782Nm
But now I'm thinking I need to be using T=Iga (Moment of Inertia x acceleration) but I can't work out how to calculate the moment of inertia...i've only ever done...
Referring to the attached diagram, how do I determine the torque required to uniformly accelerate the object about the vertical axis XX from rest to 50 rpm in 5 seconds?