Question

A string is wound round the rim of a mounted flywheel of mass `20 kg` and radius `20 cm`. A steady pull of `25 N` is applied on the cord. Neglecting friction and mass of the string, the angular acceleration of the wheel in `rad//s^(2)` is
A. `50`
B. `25`
C. `12.5`
D. `6.25`

Answer 1

`tau=Ialphaimplies25xx0.2=(1)/(2)xx20xx(0.2)^(2)alpha`
`alpha==12.5 rad//s^(2)`