3. A pendulum placed on the earth's surface has the period of 1 s. What is the period of this pendulum when placed on the moon surface? The radius and mass of the moon are 3/11 and 1/81 of the earth, respectively.
(A) 0.1 s
(B) 0.4 s
(C) 1 s
(D) 2.5 s
(E) 10 s

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