Question

A girl swings on a cradle in sitting position. If she stands, the time period of cradle

• A. decreases
• B. increases
• C. remains constant
• D. first increases then it remains constant

Answer 1

Answer: (A)

decreases

Answer 2

The time period, $T=2\pi \sqrt{\frac{l}{g}}$ where I is the length of simple pendulum. On standing the effective length of the pendulum measured from the point of suspension decreases. Hence, the time period of cradle decreases.