First slide

Introduction to oscillations

Question

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

Easy

A

decreases
B

increases
C

remains constant
D

first increase then it remains constant

Solution

Time period decreases.
because $T = 2 π \sqrt{\frac{l}{g}}$ ,
T ∝ $\sqrt{l}$
if length decreases then T also decreases
when girl stands length of pendulum decreases, hence time period of cradle decreases

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