A child swinging on a swing in sitting position, stands up, then the time period of the swing will (a) increase (b) decrease (c) remains same (d) increases of the child is long and decreases if the child is short

Answer: (b). The swing acts like a pendulum whose length is up to the centre of mass of the child. On standing up, the centre of mass rises, so the effective length decreases. T ∝ √(l), so T decreases. So the answer is (b) decrease.

A child swinging on a swing in sitting position, stands up, then the… | JEE Main 2002 (AIEEE)

Q83JEE Main 2002 · AIEEEEasy

Simple Pendulum

A child swinging on a swing in sitting position, stands up, then the time period of the swing will

Show answer and solution

Answer: (b)

The swing acts like a pendulum whose length is up to the centre of mass of the child.
On standing up, the centre of mass rises, so the effective length decreases.
$T \propto \sqrt{l}$ , so $T$ decreases.
So the answer is (b) decrease.

Report a mistake

Simple Pendulum question from JEE Main 2002 (AIEEE)

More questions on Simple Pendulum