I say "silly" because I'm actually baffled that I can't figure this out. I'm just forgetting the basics and am stumped at how to correctly approach this. Let's say I want an AC motor that is connected to a shaft which is, in turn, connected to a metal plate. I know the weight of the shaft and the plate, as well as the diameter of the plate. How would I use that information to find out the torque required by the motor to turn the plate at the rated RPM without binding or slowing down? And then, let's say I place objects of known weight on top of this plate, that will obviously add weight on the plate, but will not necessarily move WITH the plate. How could this be added into the equation? Thank you for the help.