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  4. The effective length of a simple pendulum is the sum of the following three: length of string, radius of bob, and length of hook. In a simple pendulum experiment, the length of the string, as measured by a meter scale, is 92.0 cm. The radius of the bob combined with the length of the hook, as measured by a vernier callipers, is 2.15 cm. The effective length of the pendulum is

Q. The effective length of a simple pendulum is the sum of the following three: length of string, radius of bob, and length of hook.
In a simple pendulum experiment, the length of the string, as measured by a meter scale, is $92.0\, cm$. The radius of the bob combined with the length of the hook, as measured by a vernier callipers, is $2.15\, cm$. The effective length of the pendulum is

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Solution:

$(92.0+2.15) cm =94.15\, cm$.
Rounding off to first decimal place, we get $94.2\, cm$.

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