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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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94.1 cm

94.15 cm

94 cm

94.2 cm

answer is B.

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Detailed Solution

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

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