In the first case, frequency of oscillation,
`n=(1)/(2pi)sqrt((MB)/(I))`
In the second case, frequency of oscillation,
`n^(1)=(1)/(2pi)sqrt((MB)/(2I))rArr(n^(1))/(n)=(1)/(sqrt2)rArr(T^(1))/(T)+sqrt2`
`(or) T^(1)=sqrt2T (or) 40T^(1)=sqrt2xx40T`
`(or) t^(1)=sqrt2t=sqrt2"minute"=1.414 "minute"`