Question

The kinetic energy of a particle executing SHM is 16J. When it is in its mean position. If the amplitude of oscillation is 25cm and the mass of the particle is 5.12 kg, the time period of its oscillation in second is
A. `pi//5 s`
B. `2pi s`
C. `20 pi s`
D. `5pi s`

Answer 1

Correct Answer - A
`(1)/(2)momega^(2)A^(2)=16`
`therefore omega^(2)=(16xx2)/(5.12xx25xx25xx10^(-4))`
`therefore omega=(4)/(sqrt(2.56)xx25xx10^(-2))=(4)/(1.6xx25xx10^(-3))`
`therefore omega=(10^(3))/(10)=10^(2) therefore omega=10`
`T=(2pi)/(omega)=(2pi)/(10)=(pi)/(5)`