The time period of a seconds pendulum is $2\, sec$. The spherical bob which is empty from inside has a mass $50\; gram$, this now is replaced by another solid of same radius but have different mass of $100\; gram$. The new time period will be ..... $\sec$
AIIMS 2010, Easy
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$T = 2\pi \sqrt {\frac{L}{g}}$ i.e., time period of a simple pendulum depends upon effective length and acceleration due to gravity, not on mass. So, $T = 2\, sec$.
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