Why put pennies on big bens pendulum?

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system

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Why put pennies on big bens pendulum?
« on: 11/05/2011 15:01:02 »
If the period of a pendulum is dictated by its length, not the weight of the bob, why do they put pennies on Big Ben's?
Asked by @NickDay2

                                       
Go to the show page.
                                       
[chapter podcast=3090 track=11.05.08/Naked_Scientists_Show_11.05.08_8460.mp3]  or Listen to the Answer[/chapter] or [download as MP3]
« Last Edit: 11/05/2011 15:01:02 by _system »

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@NickDay2

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« Reply #1 on: 12/05/2011 11:11:05 »
@NakedScientists Many thanks Dave and Chris, great answer (re. Ben, Bob and Penny).

was tweeted by @NickDay2