- #1
Heat
- 273
- 0
Homework Statement
A string is wrapped several times around the rim of a small hoop with radius 8.00 cm and mass 0.180kg. The free end of the string is held in place and the hoop is released from rest (the figure View Figure ). After the hoop has descended 95.0cm, calculate
the angular speed of the rotating hoop and the speed of its center.
Homework Equations
The Attempt at a Solution
First attempt was like this
I thought that KE is 0 at initial ,and thought that I could get angular speed this way, but that would just give me that angular speed is 0. :O
Then I tried a formula given by the book for a yoyo, which is vcm = sqrt (4/3gh)
that did not result, and then is another formula that vcm = R(omega)
I don't have omega, and don't have vcm. So I can't use it at this instance. :(