Q. A girl swings on cradle in a sitting position. If she stands what happens to the time period of girl and cradle?
A) Time period decreases
B) Time period increases
C) Remains constant
D) First increases and then remains constant
Explanation
(a) As the girl stands up, the effective length of pendulum decreases due to the reason that the centre of gravity rises up. Hence, according to
$T = 2\pi\sqrt{\frac{l}{g}}$
$T$ will decrease.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.