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

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

AIPMTAIPMT 1994Oscillations

Solution:

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.