Physics, 05.05.2020 15:13, Fatimaneedhelp

In a harry potter movie, there is a big pendulum in the great hall that goes back and forth once every 18.9 s. what is the length of the pendulum(if it obeys physics instead of magic)? (unit=m) PLEAS HEL M

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In a harry potter movie, there is a big pendulum in the great hall that goes back and forth once eve...