Deduce the relation between torque and angular acceleration.

Explanation

The torque produced by the force on the point mass m about the axis can be written as,
`taui=rF sin 90^(@)=rF [ :' sin 90^(@)=1]`
`rau=rma [:' (F=m)]`
`tau=r mr alpha=mr^(2) alpha [ :' (a=r alpha)]`
`tau=(Sigma m_(i)r_(i)^(2))vec(alpha)`
`vec(tau)=Ivec(alpha)`