A girl is swinging in the sitting position.How will the period of the swing change if she stands up?

A girl is swinging in the sitting position.How will the period of the

1.	A girl is swinging in the sitting position.How will the period of the swing change if she stands up?
Answer» Solution :The girl and the swing together constitute a PENDULUM of TIME period `T=2pisqrti/g`. As the girl stands up,her CENTRE of gravity is raised.The DISTANCE between the point of suspension and the centre of gravity decreases.i.e. lenght I decresese.Hence the time period T decreases.