Question

A pendulum completes 2 oscillations in 5sec what is the time period if g= 9.8^2 find the length

Answer 1

Frequency= 2 / 5 Hz

So, Time period reciprocal of it.

T = 5 / 2 s = 2.5 s

T = 2 π √ l / g

By solving this,

l = T² g / 4 π²

l = (2.5)² × 9.8 / 4 × (22 / 7)²

l = 6.25 × 9.8 / 4 × 484 / 49

l = 61.25 / 9.877 × 4