AIEEE 2012 Solved Paper

If a simple pendulum has significant amplitude (up to a factor of

1

e

of original ) only in the period between t=0s to t=τs, then τ may be called the average life of the pendulum When the spherical bob of the pendulum suffers a retardation (due to viscous drag) proportional to its velocity with b as the constant of proportionality, the average life time of the pendulum is (assuming damping is small) in seconds :