Posted by Reema on Sunday, November 21, 2010 at 8:01pm.
The period P is 3/120 = 1/40 minute = 1.5 seconds.
P = 2*pi*sqrt(L/g) = 1.5 s
sqrt(L/g) = 0.2387
L/g = 0.05699
L = 0.569 m
That doesn't seem very huge to me.
Where did you derive 0.2387 ?
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