- #1
mathlete
- 151
- 0
Here is the question (it's part of a lab):
"From your lectures in mechanics you should be able to derive:
[tex]\alpha = \frac{mgr}{I+mr^2}[/tex]
This equation ignores the effect of the pulleys and the mass of the connecting string"
The lab was basically setting up a mass on a string over a pulley, connected to a rotation horizontal disc which would oscillate back and forth (if this information is needed).
Don't know where to start - I thought maybe conservation of energy, PEi + KEi = PEf + KEf, but I can't get anywhere.
"From your lectures in mechanics you should be able to derive:
[tex]\alpha = \frac{mgr}{I+mr^2}[/tex]
This equation ignores the effect of the pulleys and the mass of the connecting string"
The lab was basically setting up a mass on a string over a pulley, connected to a rotation horizontal disc which would oscillate back and forth (if this information is needed).
Don't know where to start - I thought maybe conservation of energy, PEi + KEi = PEf + KEf, but I can't get anywhere.