- #1
lc99
- 161
- 3
Homework Statement
Hoop and disk with uniform mass distribution have the same radius but the total masses are not known. They both roll down ramp without slipping, reaching the bottom in the same time. What can you deduce about the relative masses?
1) disk is heavier, twice the mass of loop
2) the hoop is heavier, twice the mass of disk.
3) hoopi is heavier, twice the mass of disk
4) disk is lighter, 3/4 mass of hoop
5) hoop and disk have same mass
Homework Equations
The Attempt at a Solution
I'm thinking that the answer is 2) because hoop = MR^2 while disk is 1/2MR^2
But, i don't think this is that easy because they both roll without slipping, and they reach the bottom at the same time. If this is the case, mass does not really matter for they time they reach the bottom of the ramp? I'm kinda stuck ;/