1.

Springs of spring constant K,3K,9K,27K,….243K are connected in series. A mass M is attached to the last spring and the system is allowed to make oscillation. The time period will beA. `2pisqrt((M)/(K))`B. `2pisqrt((3M)/(2K))`C. `(4pi)/(9)sqrt((91M)/(3K))`D. `2pisqrt((4M)/(3K))`

Answer» C
`(1)/(K_(0))=(1)/(K)+(1)/(3K)+(1)/(9K)+.......+(1)/(243K)`
`:. K_(0)=(243K)/(364)`
`T=2pisqrt((m364)/(243K))=(4pi)/(9)sqrt((91M)/(3K))`


Discussion

No Comment Found

Related InterviewSolutions