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A girl is swinging on a swing in the sit...

A girl is swinging on a swing in the sitting position. How will the period of swing be affected if she stands up?

Text Solution

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This can be explained using the concept of a simple pendulum. We know that the time period of a simple pendulum is given by
` T = 2pi sqrt(l/g) i.e., T prop sqrtl`
When the girl stands up, the distance between the point of suspension and the centre of mass of the swinging body decreases i.e., I decreases, so I will also decrease.
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Knowledge Check

  • A man sitting on a swing which is moving to an angle of 60^@ from the vertical is blowing a whistle which has a frequency of 2.0 k Hz. The whistle is 2.0 m from the fixed support point of the swing. A sound detector which detects the whistle sound is kept in front of the swing. The maximum frequency the sound detector detected is

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    A
    2.027 kHz
    B
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    C
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