Posted by **Dave** on Saturday, February 5, 2011 at 11:02pm.

A child of mass 40.0 kg is swinging on a swing with ropes of length 4.0 m. How long does it take the child to swing from the maximum height on one side to the other?

- Physics -
**drwls**, Sunday, February 6, 2011 at 2:20am
Half of the period of the swing (which is essentially a pendulum).

It will be independent of the mass.

The period of a pendulum is

2 pi sqrt(L/g)

Half of that will be your answer.

Having two ropes instead of one does not change the formula from that of a simple pendulum.

- Physics -
**Dave**, Sunday, February 6, 2011 at 2:35am
Thanks. I was confused by the way the question was worded and my answer was 2 times bigger than what the answer is supposed to be.

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