^ but they are made of different materials, so the density would be different in them - does the density not matter?
Quote:
A hoop (I=MR^2) rolls with constant velocity and without sliding along level ground. Its rotational kinetic energy is:
a. half its translational kinetic energy
b. the same as its translational kinetic energy
c. twice its translational kinetic energy
d. four times its translational kinetic energy
e. one third its translational kinetic energy
This one, I have no clue.
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So I'm getting the idea of either half or twice the translational energy - any ideas?