Question

What is the period of a simple pendulum 80 cm long (a) on earth (b) when it is in a freely falling elevator?

Answer 1

Answer:

Explanation:

Given

length of Pendulum $L=80\ cm$

Time period of simple pendulum is given by

$T=2\pi \sqrt{\frac{L}{g}}$

where L=length of pendulum

g=acceleration due to gravity

For $L=80\ cm$

$T=2\pi \sqrt{\frac{0.8}{9.8}}$

$T=2\pi \times 0.6058$

$T=3.80\ s$

(b)In a freely falling elevator

effective gravity will be $g_{eff}=g-g=0$

Therefore time period will become infinite