physics
posted by Jadyn on .
A textbook is 23cm long, 18cm wide and 4cm deep and its mass is 1.8 kg. Find the work required to accelerate it from rest to an angular speed of 2.75 rad/s spinning about the:
length axis
width axis
depth axis

you have to know the moment of inertia of the "plate" about each axis.Here included is a block, with the moment of inertia through the center in each dimension, and then you use the parallel axis theorem to move it to the edge. Not hard, but some math. You have to calculate 1/2 the diagonal distance in each instance (r).
http://en.wikipedia.org/wiki/List_of_moments_of_inertia
http://en.wikipedia.org/wiki/Parallel_axis_theorem