Question

A seconds pendulum is mounted in a rocket. Its period of oscillation will decrease when rocket is

• A. moving down with uniform acceleration
• B. moving around the earth in geostationary orbit
• C. moving up with uniform velocity
• D. moving up with uniform acceleration

Answer 1

Answer: (D)

moving up with uniform acceleration

Answer 2

Period of oscillation,
$T=2\pi \sqrt{ \frac{ l}{ g}}$
Therefore T will decrease when acceleration (g) increases and g will increase when the rocket moves up with a uniform acceleration.

So, the correct option is (D): moving up with uniform acceleration.