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A small wooden sphere of density .7 g/cm^3 is attached to the end of a string...

A small wooden sphere of density .7 g/cm^3 is attached to the end of a string of length 2.0 m in a large tank of water. The other end of the string is attached to the bottom of the tank, forming a reverse pendulum. The tank is in a train moving along a circular path of radius 200 m at a constant speed of 30 m/s. Ignore water friction. The period of small oscillations of the pendulum is closest to:

ANSWER: 4.1 s

Science   Advanced-Physics   
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