Question

The time taken by a pendulum to complete 20 vibrations in 85 secomd

Answer 1

Answer:

T = 4.25 sec

Explanation:

frequency of pendulum(f) = no. of vibrations/time period

f = 20 / 85

f = 0.235 oscillation/ sec

so,

Time period (T) = 1 / f

( T ) = 1/ 0.235

(T) = 4.255 sec