Four tiny spheres are fastened to the ends of two rods of negligible mass lying in the xy plane.
figure is illustrated below.
o | o
The Attempt at a Solution
I see I can derive the problem using equations to answer my question.
But here is a statement the textbook made
In part A we are ask "if the system rotates about the y axis" whereas in part B, we are asked "rotate the system about z axis"
In this problem, we will expect all four spheres will be revolving when it is revolve about z axis.
How did the author come up with this statement using W-K theorem?"Based on the work-kinetic energy theorem, that the rotational kinetic energy in part A, is smaller than that in part b, which indicates it would require less work to set system into rotation about the y axis than about z axis"