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Physics
OpenStudy (anonymous):

The bob of a pendulum, of mass 1.2*10^-2kg, swings with an amplitude of 51mm. It takes 46.5s to complete 25 oscillations. Calculate the length of the pendulum and the magnitude of the restoring force that acts on the bob when at is maximum displacement.

OpenStudy (jamesj):

What is the formula for the period of a pendulum?

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